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1

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Unveiling the structural origin of the high carrier mobility of a molecular monolayer on boron nitride (2014)

Rui Xu, Daowei He, Yuhan Zhang, Bing Wu, Fengyuan Liu, Lan Meng, Jun-Fang Liu, Qisheng Wu, Yi Shi, Jinlan Wang, Jia-Cai Nie, Xinran Wang, and Lin He

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-13

Beschreibung: Author(s): Rui Xu, Daowei He, Yuhan Zhang, Bing Wu, Fengyuan Liu, Lan Meng, Jun-Fang Liu, Qisheng Wu, Yi Shi, Jinlan Wang, Jia-Cai Nie, Xinran Wang, and Lin He Very recently, it was demonstrated that the carrier mobility of a molecular monolayer dioctylbenzothienobenzothiophene (C 8 -BTBT) on boron nitride can reach 10 cm 2 /Vs, the highest among the previously reported monolayer molecular field-effect transistors. Here we show that the high-quality single cry... [Phys. Rev. B 90, 224106] Published Fri Dec 12, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Ultrafast high-fidelity initialization of a quantum-dot spin qubit without magnetic fields (2014)

Jonathan D. Mar, Jeremy J. Baumberg, Xiulai Xu, Andrew C. Irvine, and David A. Williams

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Jonathan D. Mar, Jeremy J. Baumberg, Xiulai Xu, Andrew C. Irvine, and David A. Williams We demonstrate the initialization of a single quantum-dot hole spin with high fidelity (lower bound 〉97%), on picosecond time scales, and without the need for magnetic fields. Using the initialization scheme based on rapid electric-field ionization of a resonantly excited exciton, this is achieve... [Phys. Rev. B 90, 241303] Published Mon Dec 15, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Many-body effects in a quasi-one-dimensional electron gas (2014)

Sanjeev Kumar, Kalarikad J. Thomas, Luke W. Smith, Michael Pepper, Graham L. Creeth, Ian Farrer, David Ritchie, Geraint Jones, and Jonathan Griffiths

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Sanjeev Kumar, Kalarikad J. Thomas, Luke W. Smith, Michael Pepper, Graham L. Creeth, Ian Farrer, David Ritchie, Geraint Jones, and Jonathan Griffiths We have investigated electron transport in a quasi-one dimensional (quasi-1D) electron gas as a function of the confinement potential. At a particular potential configuration, and electron concentration, the ground state of a 1D quantum wire splits into two rows to form an incipient Wigner lattice. ... [Phys. Rev. B 90, 201304] Published Thu Nov 06, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Impact of deformation on the atomic structures and dynamics of a Cu-Zr metallic glass: A molecular dynamics study (2014)

Y. Zhang, M. I. Mendelev, C. Z. Wang, R. Ott, F. Zhang, M. F. Besser, K. M. Ho, and M. J. Kramer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): Y. Zhang, M. I. Mendelev, C. Z. Wang, R. Ott, F. Zhang, M. F. Besser, K. M. Ho, and M. J. Kramer Despite numerous studies on the atomic structures of Cu-Zr metallic glasses (MGs), their inherent structural ordering, e.g., medium-range order (MRO), remains difficult to describe. Specifically lacking is an understanding of how the MRO responds to deformation and the associated changes in atomic m... [Phys. Rev. B 90, 174101] Published Mon Nov 03, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Solute-defect interactions in Al-Mg alloys from diffusive variational Gaussian calculations (2014)

E. Dontsova, J. Rottler, and C. W. Sinclair

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): E. Dontsova, J. Rottler, and C. W. Sinclair Resolving atomic-scale defect topologies and energetics with accurate atomistic interaction models provides access to the nonlinear phenomena inherent at atomic length and time scales. Coarse graining the dynamics of such simulations to look at the migration of, e.g., solute atoms, while retaining t... [Phys. Rev. B 90, 174102] Published Wed Nov 05, 2014

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Tuning the electrically evaluated electron Landé g factor in GaAs quantum dots and quantum wells of different well widths (2014)

G. Allison, T. Fujita, K. Morimoto, S. Teraoka, M. Larsson, H. Kiyama, A. Oiwa, S. Haffouz, D. G. Austing, A. Ludwig, A. D. Wieck, and S. Tarucha

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): G. Allison, T. Fujita, K. Morimoto, S. Teraoka, M. Larsson, H. Kiyama, A. Oiwa, S. Haffouz, D. G. Austing, A. Ludwig, A. D. Wieck, and S. Tarucha We evaluate the Landé g factor of electrons in quantum dots (QDs) fabricated from GaAs quantum well (QW) structures of different well width. We first determine the Landé electron g factor of the QWs through resistive detection of electron spin resonance and compare it to the enhanced electron g fact... [Phys. Rev. B 90, 235310] Published Thu Dec 11, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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7

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Shallow halogen vacancies in halide optoelectronic materials (2014)

Hongliang Shi and Mao-Hua Du

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Hongliang Shi and Mao-Hua Du Halogen vacancies (VH) are usually deep color centers (F centers) in halides and can act as major electron traps or recombination centers. The deep VH contributes to the typically poor carrier transport properties in halides. However, several halides have recently emerged as excellent optoelectronic... [Phys. Rev. B 90, 174103] Published Wed Nov 05, 2014

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8

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Depth dependence of the ionization energy of shallow hydrogen states in ZnO and CdS (2014)

T. Prokscha, H. Luetkens, E. Morenzoni, G. J. Nieuwenhuys, A. Suter, M. Döbeli, M. Horisberger, and E. Pomjakushina

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): T. Prokscha, H. Luetkens, E. Morenzoni, G. J. Nieuwenhuys, A. Suter, M. Döbeli, M. Horisberger, and E. Pomjakushina The characteristics of shallow hydrogenlike muonium (Mu) states in nominally undoped ZnO and CdS (0001) crystals have been studied close to the surface at depths in the range of 10–180 nm by using low-energy muons and in the bulk using conventional μSR. The muon implantation depths are adjusted by t... [Phys. Rev. B 90, 235303] Published Mon Dec 01, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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9

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Calorimetric and acoustic emission study of martensitic transformation in single-crystalline Ni_{2}MnGa alloys (2014)

László Z. Tóth, Sándor Szabó, Lajos Daróczi, and Dezső L. Beke

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): László Z. Tóth, Sándor Szabó, Lajos Daróczi, and Dezső L. Beke The jerky character of austenite-martensite phase transformation in Ni 2 MnGa single crystals (with 10M martensite structure) has been investigated by thermal cycling using a differential scanning calorimeter (DSC) and by detection of acoustic emissions (AEs) at low cooling and heating rates (0.1 K/mi... [Phys. Rev. B 90, 224103] Published Thu Dec 04, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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10

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Intersurface interaction via phonons in a three-dimensional topological insulator (2014)

Tetsuro Habe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Tetsuro Habe We theoretically study the phonon-mediated intersurface electron-electron interactions on the pseudo-two-dimensional metallic states at the two surfaces of a three-dimensional topological insulator. From a model of a three-dimensional topological insulator including the phonon excitation in it, we d... [Phys. Rev. B 89, 035305] Published Fri Jan 10, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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11

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Dynamics of a localized spin excitation close to the spin-helix regime (2014)

G. Salis, M. P. Walser, P. Altmann, C. Reichl, and W. Wegscheider

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): G. Salis, M. P. Walser, P. Altmann, C. Reichl, and W. Wegscheider The time evolution of a local spin excitation in a (001)-confined two-dimensional electron gas subjected to Rashba and Dresselhaus spin-orbit interactions of similar strength is investigated theoretically and compared with experimental data. Specifically, the consequences of the finite spatial exten... [Phys. Rev. B 89, 045304] Published Mon Jan 13, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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12

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Tight-binding calculations of image-charge effects in colloidal nanoscale platelets of CdSe (2014)

R. Benchamekh, N. A. Gippius, J. Even, M. O. Nestoklon, J.-M. Jancu, S. Ithurria, B. Dubertret, Al. L. Efros, and P. Voisin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): R. Benchamekh, N. A. Gippius, J. Even, M. O. Nestoklon, J.-M. Jancu, S. Ithurria, B. Dubertret, Al. L. Efros, and P. Voisin CdSe nanoplatelets show perfectly quantized thicknesses of a few monolayers. They present a situation of extreme, yet well defined quantum confinement. Due to a large dielectric contrast between the semiconductor and its ligand environment, interaction between carriers and their dielectric images st... [Phys. Rev. B 89, 035307] Published Mon Jan 13, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Ab initio modeling of the two-dimensional energy landscape of screw dislocations in bcc transition metals (2014)

L. Dezerald, Lisa Ventelon, E. Clouet, C. Denoual, D. Rodney, and F. Willaime

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): L. Dezerald, Lisa Ventelon, E. Clouet, C. Denoual, D. Rodney, and F. Willaime A density functional theory (DFT) study of the 1/2〈111〉 screw dislocation was performed in the following body-centered cubic transition metals: V, Nb, Ta, Cr, Mo, W, and Fe. The energies of the easy, hard, and split core configurations, as well as the pathways between them, were investigated and use... [Phys. Rev. B 89, 024104] Published Wed Jan 15, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Stabilized silicene within bilayer graphene: A proposal based on molecular dynamics and density-functional tight-binding calculations (2014)

G. R. Berdiyorov, M. Neek-Amal, F. M. Peeters, and Adri C. T. van Duin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): G. R. Berdiyorov, M. Neek-Amal, F. M. Peeters, and Adri C. T. van Duin Freestanding silicene is predicted to display comparable electronic properties as graphene. However, the yet synthesized silicenelike structures have been only realized on different substrates which turned out to exhibit versatile crystallographic structures that are very different from the theoreti... [Phys. Rev. B 89, 024107] Published Wed Jan 22, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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15

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N incorporation and associated localized vibrational modes in GaSb (2014)

J. Buckeridge, D. O. Scanlon, T. D. Veal, M. J. Ashwin, A. Walsh, and C. R. A. Catlow

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): J. Buckeridge, D. O. Scanlon, T. D. Veal, M. J. Ashwin, A. Walsh, and C. R. A. Catlow We present results of electronic structure calculations on the N-related localized vibrational modes in the dilute nitride alloy GaSb1−xNx. By calculating the formation energies of various possible N incorporation modes in the alloy, we determine the most favorable N configurations, and we calculate... [Phys. Rev. B 89, 014107] Published Wed Jan 22, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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16

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Predicting self-diffusion in metal oxides from first principles: The case of oxygen in tetragonal ZrO2 (2014)

Mostafa Youssef and Bilge Yildiz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): Mostafa Youssef and Bilge Yildiz Theoretical prediction of self-diffusion in a metal oxide in a wide range of thermodynamic conditions has been a long-standing challenge. Here, we establish that combining the formation free energies and migration barriers of all charged oxygen defects as calculated by density functional theory, wit... [Phys. Rev. B 89, 024105] Published Thu Jan 16, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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17

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Dislocation networks in 4He crystals (2014)

A. D. Fefferman, F. Souris, A. Haziot, J. R. Beamish, and S. Balibar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): A. D. Fefferman, F. Souris, A. Haziot, J. R. Beamish, and S. Balibar The mechanical behavior of crystals is dominated by dislocation networks, their structure, and their interactions with impurities or thermal phonons. However, in classical crystals, networks are usually random with impurities often forming nonequilibrium clusters when their motion freezes at low tem... [Phys. Rev. B 89, 014105] Published Thu Jan 16, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Local structure in perovskite (Ba,Sr)TiO3: Reverse Monte Carlo refinements from multiple measurement techniques (2014)

Igor Levin, Victor Krayzman, and Joseph C. Woicik

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Igor Levin, Victor Krayzman, and Joseph C. Woicik Local and average structures of ceramic Ba1−xSrxTiO3 solid solutions have been reconciled using Reverse Monte Carlo (RMC) refinements of atomic positions that employ simultaneous fitting of neutron total scattering data, x-ray absorption fine structure, and patterns of diffuse scattering in electron... [Phys. Rev. B 89, 024106] Published Fri Jan 17, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Anomalous crossed Andreev reflection in a mesoscopic superconducting ring hosting Majorana fermions (2014)

Minchul Lee, Heunghwan Khim, and Mahn-Soo Choi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Minchul Lee, Heunghwan Khim, and Mahn-Soo Choi We investigate the Majorana physics and its effect on the electron transport in the nontopological superconductor (NS)–topological superconductor (TS) double junctions of a loop geometry. We find that, depending on the ratio between the lengths of two topologically different regions and the localiza... [Phys. Rev. B 89, 035309] Published Fri Jan 17, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Ab initio study of the effects of interfacial structure on the ferroelectric, magnetic, and magnetoelectric coupling properties of Fe/BaTiO3 multiferroic tunnel junctions (2014)

Binglun Yin and Shaoxing Qu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Binglun Yin and Shaoxing Qu Multiferroic tunnel junctions (MFTJs) are usually composed of two ferromagnetic electrodes and an ultrathin layer of ferroelectric barrier, with many physical properties sensitive to the interfacial details. In Fe/BaTiO3 heterostructures, two types of interfacial atomic configurations were observed ... [Phys. Rev. B 89, 014106] Published Tue Jan 21, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Local band bending and grain-to-grain interaction induced strain nonuniformity in polycrystalline CdTe films (2014)

V. Consonni, N. Baier, O. Robach, C. Cayron, F. Donatini, and G. Feuillet

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): V. Consonni, N. Baier, O. Robach, C. Cayron, F. Donatini, and G. Feuillet The local physical properties of polycrystalline semiconducting films drive their performances in a wide variety of optoelectronic devices but are still not completely elucidated. These properties are investigated and correlated on the same region of polycrystalline CdTe films by combining electron ... [Phys. Rev. B 89, 035310] Published Tue Jan 21, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Electron affinities and ionization energies of Cu and Ag delafossite compounds: A hybrid functional study (2014)

Mao-Sheng Miao, Sam Yarbro, Phillip T. Barton, and Ram Seshadri

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Mao-Sheng Miao, Sam Yarbro, Phillip T. Barton, and Ram Seshadri Using density functional theory with a hybrid functional, we calculate the ionization energies and electron affinities of a series of delafossite compounds (AMO2: A=Cu, Ag; M=B, Al, Ga, In, Sc). The alignments of the valence band maximum and the conduction band minimum, which directly relate to the ... [Phys. Rev. B 89, 045306] Published Tue Jan 21, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Frequency cavity pulling induced by a single semiconductor quantum dot (2014)

Daniel Valente, Jan Suffczyński, Tomasz Jakubczyk, Adrien Dousse, Aristide Lemaître, Isabelle Sagnes, Loïc Lanco, Paul Voisin, Alexia Auffèves, and Pascale Senellart

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Daniel Valente, Jan Suffczyński, Tomasz Jakubczyk, Adrien Dousse, Aristide Lemaître, Isabelle Sagnes, Loïc Lanco, Paul Voisin, Alexia Auffèves, and Pascale Senellart We investigate the emission properties of a single semiconductor quantum dot deterministically coupled to a confined optical mode in the weak-coupling regime. A strong spectral pulling, broadening, and narrowing of the cavity mode emission is evidenced when changing the spectral detuning between the... [Phys. Rev. B 89, 041302] Published Tue Jan 21, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Tunneling current through fractional quantum Hall interferometers (2014)

O. Smits, J. K. Slingerland, and S. H. Simon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): O. Smits, J. K. Slingerland, and S. H. Simon We calculate the tunneling current through a Fabry-Pérot interferometer in the fractional quantum Hall regime. Within linear response theory (weak tunneling but arbitrary source-drain voltage), we find a general expression for the current due to tunneling of quasiparticles in terms of Carlson's R fu... [Phys. Rev. B 89, 045308] Published Tue Jan 21, 2014

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Dipole-induced high-order sideband comb employing a quantum dot strongly coupled to a photonic crystal cavity via a waveguide (2014)

Jiahua Li, Rong Yu, and Ying Wu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Jiahua Li, Rong Yu, and Ying Wu We propose a scheme for high-order sideband generation (HSG) by utilizing strong coupling between a single quantum dot (QD) and a photonic crystal cavity beyond the weak-excitation approximation. Here the hybrid system is coherently driven by an external bichromatic field consisting of a continuous-... [Phys. Rev. B 89, 035311] Published Wed Jan 22, 2014

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Experimental investigation of the optical spin-selection rules in bulk Si and Ge/Si quantum dots (2014)

N. Sircar and D. Bougeard

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): N. Sircar and D. Bougeard We study the relationship between the circular polarization of photoluminescence and the magnetic-field-induced spin polarization of the recombining charge carriers in bulk Si and Ge/Si quantum dots. First, we quantitatively compare experimental results on the degree of circular polarization of phot... [Phys. Rev. B 89, 041301] Published Fri Jan 10, 2014

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Ab initio phase stability at high temperatures and pressures in the V-Cr system (2014)

A. Landa, P. Söderlind, and L. H. Yang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): A. Landa, P. Söderlind, and L. H. Yang The phase stability of vanadium metal and vanadium-chromium alloys at high temperatures and pressures is explored by means of first-principles electronic-structure calculations. Utilizing the self-consistent ab initio lattice dynamics approach in conjunction with density-functional theory, we show t... [Phys. Rev. B 89, 020101] Published Mon Jan 13, 2014

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Combinatorial model for the ferroelectric domain-network formation in hexagonal manganites (2014)

Bruno Mettout, Pierre Tolédano, Martin Lilienblum, and Manfred Fiebig

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Bruno Mettout, Pierre Tolédano, Martin Lilienblum, and Manfred Fiebig As a result of the high-temperature improper ferroelectric transition occurring in YMnO3 and other hexagonal manganites, a striking domain pattern was observed: an emergence of six domains of alternating polarization from one point in a vortexlike pattern. We derive the formation and distribution of... [Phys. Rev. B 89, 024103] Published Mon Jan 13, 2014

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Spin relaxation in inhomogeneous quantum dot arrays studied by electron spin resonance (2014)

A. F. Zinovieva, N. P. Stepina, A. I. Nikiforov, A. V. Nenashev, A. V. Dvurechenskii, L. V. Kulik, M. C. Carmo, and N. A. Sobolev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): A. F. Zinovieva, N. P. Stepina, A. I. Nikiforov, A. V. Nenashev, A. V. Dvurechenskii, L. V. Kulik, M. C. Carmo, and N. A. Sobolev Electron states in an inhomogeneous Ge/Si quantum dot array with groups of closely spaced quantum dots were studied by the conventional continuous-wave electron spin resonance and spin-echo techniques. We have found that the existence of quantum dot groups allows increasing the spin relaxation time ... [Phys. Rev. B 89, 045305] Published Thu Jan 16, 2014

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Structural, elastic, and thermal properties of cementite (Fe3C) calculated using a modified embedded atom method (2014)

Laalitha S. I. Liyanage, Seong-Gon Kim, Jeff Houze, Sungho Kim, Mark A. Tschopp, M. I. Baskes, and M. F. Horstemeyer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Laalitha S. I. Liyanage, Seong-Gon Kim, Jeff Houze, Sungho Kim, Mark A. Tschopp, M. I. Baskes, and M. F. Horstemeyer Structural, elastic, and thermal properties of cementite (Fe3C) were studied using a modified embedded atom method (MEAM) potential for iron-carbon (Fe-C) alloys. Previously developed Fe and C single-element potentials were used to develop a Fe-C alloy MEAM potential, using a statistics-based optimi... [Phys. Rev. B 89, 094102] Published Mon Mar 10, 2014

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Ab initio (2014)

Pietro Silvi, Tommaso Calarco, Giovanna Morigi, and Simone Montangero

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Pietro Silvi, Tommaso Calarco, Giovanna Morigi, and Simone Montangero Ions of the same charge inside confining potentials can form crystalline structures which can be controlled by means of the ion density and of the external trap parameters. In particular, a linear chain of trapped ions exhibits a transition to a zigzag equilibrium configuration, which is controlled ... [Phys. Rev. B 89, 094103] Published Mon Mar 10, 2014

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Non-180° polarization rotation of ferroelectric (Bi0.5Na0.5)TiO3 single crystals under electric field (2014)

Yuuki Kitanaka, Ken Yanai, Yuji Noguchi, Masaru Miyayama, Yutaka Kagawa, Chikako Moriyoshi, and Yoshihiro Kuroiwa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Yuuki Kitanaka, Ken Yanai, Yuji Noguchi, Masaru Miyayama, Yutaka Kagawa, Chikako Moriyoshi, and Yoshihiro Kuroiwa The behavior of the polarization switching by applying electric fields (E) along the 〈100〉 and 〈111〉 directions has been investigated for the single crystals of ferroelectric (Bi0.5Na0.5)TiO3 (BNT) using high-energy synchrotron radiation x-ray diffraction (SR-XRD) and density functional theory (DFT)... [Phys. Rev. B 89, 104104] Published Mon Mar 10, 2014

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Microstructure and magnetic disorder induced by nanoindentation in single-crystalline Fe (2014)

Binjun Wang, Yu Gao, and Herbert M. Urbassek

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Binjun Wang, Yu Gao, and Herbert M. Urbassek Using molecular dynamics simulation, we study nanoindentation into an Fe (100) surface. We use the so-called magnetic interaction potentials provided by Dudarev and Derlet [J. Phys.: Condens. Matter 17, 7097 (2005)] and Chiesa et al. [J. Phys.: Condens. Matter 23, 206001 (2011)] in three different p... [Phys. Rev. B 89, 104105] Published Mon Mar 10, 2014

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Signatures of two-level defects in the temperature-dependent damping of nanomechanical silicon nitride resonators (2014)

Thomas Faust, Johannes Rieger, Maximilian J. Seitner, Jörg P. Kotthaus, and Eva M. Weig

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Thomas Faust, Johannes Rieger, Maximilian J. Seitner, Jörg P. Kotthaus, and Eva M. Weig The damping rates of high quality factor nanomechanical resonators are well beyond intrinsic limits. Here, we explore the underlying microscopic loss mechanisms by investigating the temperature-dependent damping of the fundamental and third harmonic transverse flexural mode of a doubly clamped silic... [Phys. Rev. B 89, 100102] Published Mon Mar 10, 2014

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Exciton spin dynamics of colloidal CdTe nanocrystals in magnetic fields (2014)

Feng Liu, A. V. Rodina, D. R. Yakovlev, A. Greilich, A. A. Golovatenko, A. S. Susha, A. L. Rogach, Yu. G. Kusrayev, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Feng Liu, A. V. Rodina, D. R. Yakovlev, A. Greilich, A. A. Golovatenko, A. S. Susha, A. L. Rogach, Yu. G. Kusrayev, and M. Bayer The recombination and spin dynamics of excitons in colloidal CdTe nanocrystals (NCs) are studied by time-resolved photoluminescence in high magnetic fields up to 15 T and at cryogenic temperatures. The recombination decay shows a nonexponential temporal behavior, with the longest component correspon... [Phys. Rev. B 89, 115306] Published Mon Mar 10, 2014

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Superconducting proximity effect and zero-bias anomaly in transport through quantum dots weakly attached to ferromagnetic leads (2014)

Ireneusz Weymann and Piotr Trocha

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Ireneusz Weymann and Piotr Trocha The Andreev transport through a quantum dot coupled to two external ferromagnetic leads and one superconducting lead is studied theoretically by means of the real-time diagrammatic technique in sequential and cotunneling regimes. We show that the tunnel magnetoresistance (TMR) of the Andreev current... [Phys. Rev. B 89, 115305] Published Mon Mar 10, 2014

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Ultranarrow ionization resonances in a quantum dot under broadband excitation (2014)

S. Gustavsson, M. S. Rudner, L. S. Levitov, R. Leturcq, M. Studer, T. Ihn, and K. Ensslin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): S. Gustavsson, M. S. Rudner, L. S. Levitov, R. Leturcq, M. Studer, T. Ihn, and K. Ensslin Semiconductor quantum dots driven by the broadband radiation fields of nearby quantum point contacts provide an interesting setting for probing dynamics in driven quantum systems at the nanoscale. We report on real-time charge-sensing measurements of the dot occupation, which reveal sharp resonances... [Phys. Rev. B 89, 115304] Published Mon Mar 10, 2014

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Fermi-level stabilization in the topological insulators Bi2Se3 and Bi2Te3: Origin of the surface electron gas (2014)

Joonki Suh, Deyi Fu, Xinyu Liu, Jacek K. Furdyna, Kin Man Yu, Wladyslaw Walukiewicz, and Junqiao Wu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Joonki Suh, Deyi Fu, Xinyu Liu, Jacek K. Furdyna, Kin Man Yu, Wladyslaw Walukiewicz, and Junqiao Wu Two-dimensional electron gas (2DEG) coexists with topological states on the surface of topological insulators (TIs), while the origin of the 2DEG remains elusive. In this work, electron density in TI thin films (Bi2Se3, Bi2Te3, and their alloys) were manipulated by controlling the density of electro... [Phys. Rev. B 89, 115307] Published Mon Mar 10, 2014

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Anomalous anticrossing of neutral exciton states in GaAs/AlGaAs quantum dots (2014)

S. Kumar, E. Zallo, Y. H. Liao, P. Y. Lin, R. Trotta, P. Atkinson, J. D. Plumhof, F. Ding, B. D. Gerardot, S. J. Cheng, A. Rastelli, and O. G. Schmidt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): S. Kumar, E. Zallo, Y. H. Liao, P. Y. Lin, R. Trotta, P. Atkinson, J. D. Plumhof, F. Ding, B. D. Gerardot, S. J. Cheng, A. Rastelli, and O. G. Schmidt We study the effects of heavy hole–light hole (HH-LH) mixing on fine-structure and polarization properties of neutral excitons (X0) confined in single GaAs/AlGaAs quantum dots (QDs) under the application of anisotropic biaxial stress. In the large HH-LH mixing regime, these properties are substantia... [Phys. Rev. B 89, 115309] Published Wed Mar 12, 2014

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Optical second-harmonic generation induced by electric current in graphene on Si and SiC substrates (2014)

Yong Q. An, J. E. Rowe, Daniel B. Dougherty, Ji Ung Lee, and Alain C. Diebold

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Yong Q. An, J. E. Rowe, Daniel B. Dougherty, Ji Ung Lee, and Alain C. Diebold We find that the flow of direct electric current (dc) through graphene on substrate enhances surface optical second-harmonic generation (SHG) from the graphene/substrate system. The current can enhance surface SHG by about 300% for a chemical-vapor-deposition (CVD) graphene monolayer on a SiO2/Si(00... [Phys. Rev. B 89, 115310] Published Wed Mar 12, 2014

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Atomic structure and microstructures of supertetragonal multiferroic BiFeO3 thin films (2014)

F. Pailloux, M. Couillard, S. Fusil, F. Bruno, W. Saidi, V. Garcia, C. Carrétéro, E. Jacquet, M. Bibes, A. Barthélémy, G. A. Botton, and J. Pacaud

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): F. Pailloux, M. Couillard, S. Fusil, F. Bruno, W. Saidi, V. Garcia, C. Carrétéro, E. Jacquet, M. Bibes, A. Barthélémy, G. A. Botton, and J. Pacaud We revisit the atomic structure and microstructure of the so-called supertetragonal phases of highly strained epitaxial BiFeO3 thin films. Quantitative atomic resolution scanning transmission electron microscopy is used to directly image the atomic positions. A crystallographic phase suggested by el... [Phys. Rev. B 89, 104106] Published Wed Mar 12, 2014

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Investigation of electron transmission through Co/C/Co magnetic tunnel junctions (2014)

Felix Huerkamp, Peter Krüger, and Johannes Pollmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Felix Huerkamp, Peter Krüger, and Johannes Pollmann We investigate transmission properties of electrons at the interfaces of cobalt-diamond hybrid systems. To this end, we employ a Green's function method based on spin-polarized density-functional theory calculations using a Gaussian orbital representation of the wave functions. The considered open s... [Phys. Rev. B 89, 125302] Published Wed Mar 12, 2014

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Hall viscosity of hierarchical quantum Hall states (2014)

M. Fremling, T. H. Hansson, and J. Suorsa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): M. Fremling, T. H. Hansson, and J. Suorsa Using methods based on conformal field theory, we construct model wave functions on a torus with arbitrary flat metric for all chiral states in the abelian quantum Hall hierarchy. These functions have no variational parameters, and they transform under the modular group in the same way as the multic... [Phys. Rev. B 89, 125303] Published Wed Mar 12, 2014

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Ab initio (2014)

S. Mazevet, V. Recoules, J. Bouchet, F. Guyot, M. Harmand, A. Ravasio, and A. Benuzzi-Mounaix

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-14

Beschreibung: Author(s): S. Mazevet, V. Recoules, J. Bouchet, F. Guyot, M. Harmand, A. Ravasio, and A. Benuzzi-Mounaix Using ab initio simulations within the generalized gradient approximation, we calculate x-ray absorption near edge spectra (XANES) at the iron K edge throughout the high-pressure phase diagram and up to extreme density and temperature conditions that are representative of the Earth's inner core (up ... [Phys. Rev. B 89, 100103] Published Thu Mar 13, 2014

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Ab initio (2014)

A. van de Walle, Q. Hong, L. Miljacic, C. Balaji Gopal, S. Demers, G. Pomrehn, A. Kowalski, and P. Tiwary

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): A. van de Walle, Q. Hong, L. Miljacic, C. Balaji Gopal, S. Demers, G. Pomrehn, A. Kowalski, and P. Tiwary We describe a simple method to determine, from ab initio calculations, the complete orientation dependence of interfacial free energies in solid-state crystalline systems. We illustrate the method with an application to precipitates in the Al-Ti alloy system. The method combines the cluster expansio... [Phys. Rev. B 89, 184101] Published Fri May 02, 2014

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Coulomb interaction effects on the terahertz photon-assisted tunneling through an InAs quantum dot (2014)

R.-Y. Yuan, G.-B. Zhu, X. Zhao, Y. Guo, H. Yan, Q. Sun, and A.-C. Ji

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): R.-Y. Yuan, G.-B. Zhu, X. Zhao, Y. Guo, H. Yan, Q. Sun, and A.-C. Ji Recently, the terahertz (THz) photon-assisted tunneling (PAT) through a two-level InAs quantum dot (QD) has been successfully realized in experiment [Phys. Rev. Lett. 109, 077401 (2012)]. The Coulomb interaction in this device is comparable with the energy difference between the two energy levels. W... [Phys. Rev. B 89, 195301] Published Fri May 02, 2014

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Structural stability and topological surface states of the SnTe (111) surface (2014)

Jianfeng Wang, Junwei Liu, Yong Xu, Jian Wu, Bing-Lin Gu, and Wenhui Duan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): Jianfeng Wang, Junwei Liu, Yong Xu, Jian Wu, Bing-Lin Gu, and Wenhui Duan We perform first-principles calculations to study the stability and electronic structure of the (111) surface of SnTe, a representative topological crystalline insulator (TCI). We find three stable surface phases, which support two qualitatively different types of topological surface states: type I ... [Phys. Rev. B 89, 125308] Published Thu Mar 20, 2014

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Propagating phase interface with intermediate interfacial phase: Phase field approach (2014)

Kasra Momeni and Valery I. Levitas

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Kasra Momeni and Valery I. Levitas An advanced three-phase phase field approach (PFA) is suggested for a nonequilibrium phase interface that contains an intermediate phase, in particular, a solid-solid interface with a nanometer-sized intermediate melt (IM). A thermodynamic potential in the polar order parameters is developed that sa... [Phys. Rev. B 89, 184102] Published Mon May 05, 2014

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Ultrathin GaN nanowires: Electronic, thermal, and thermoelectric properties (2014)

A. H. Davoody, E. B. Ramayya, L. N. Maurer, and I. Knezevic

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): A. H. Davoody, E. B. Ramayya, L. N. Maurer, and I. Knezevic We present a comprehensive computational study of the electronic, thermal, and thermoelectric (TE) properties of gallium nitride nanowires (NWs) over a wide range of thicknesses (3–9 nm), doping densities (1018–1020 cm−3), and temperatures (300–1000 K). We calculate the low-field electron mobility b... [Phys. Rev. B 89, 115313] Published Wed Mar 19, 2014

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Ground-state degeneracy for Abelian anyons in the presence of gapped boundaries (2014)

Anton Kapustin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Anton Kapustin Gapped phases with long-range entanglement may admit gapped boundaries. If the boundary is gapped, the ground-state degeneracy is well defined and can be computed using methods of topological quantum field theory. We derive a general formula for the ground-state degeneracy for Abelian fractional qua... [Phys. Rev. B 89, 125307] Published Wed Mar 19, 2014

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Ferromagnetic excited-state Mn2+ dimers in Zn1−xMnxSe quantum dots observed by time-resolved magnetophotoluminescence (2014)

Liam R. Bradshaw, Joseph W. May, Jillian L. Dempsey, Xiaosong Li, and Daniel R. Gamelin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Liam R. Bradshaw, Joseph W. May, Jillian L. Dempsey, Xiaosong Li, and Daniel R. Gamelin Colloidal Mn2+-doped semiconductor nanocrystals are solution processable analogs of classic phosphor and diluted magnetic semiconductor materials with promising applications ranging from fluorescence microscopy to spintronic information processing. At doping levels of only a few cation mole percent,... [Phys. Rev. B 89, 115312] Published Wed Mar 19, 2014

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Electronic structures of GaP(100) surface reconstructions probed with two-photon photoemission spectroscopy (2014)

Philipp Sippel, Oliver Supplie, Matthias M. May, Rainer Eichberger, and Thomas Hannappel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): Philipp Sippel, Oliver Supplie, Matthias M. May, Rainer Eichberger, and Thomas Hannappel The electronic structures of two significant atomically well-defined (100)-surface reconstructions of gallium phosphide were investigated with two-photon-photoemission spectroscopy (2PPE). We allocated a series of occupied and unoccupied surface states and deduced the influence of each particular re... [Phys. Rev. B 89, 165312] Published Mon Apr 28, 2014

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Acute and obtuse rhombohedrons in the local structures of relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 (2014)

Wen Hu, Kouichi Hayashi, Kenji Ohwada, Jun Chen, Naohisa Happo, Shinya Hosokawa, Masamitu Takahasi, Alexei A. Bokov, and Zuo-Guang Ye

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-30

Beschreibung: Author(s): Wen Hu, Kouichi Hayashi, Kenji Ohwada, Jun Chen, Naohisa Happo, Shinya Hosokawa, Masamitu Takahasi, Alexei A. Bokov, and Zuo-Guang Ye The local structures around Nb and Pb in the prototypical relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 (PMN) were investigated by x-ray fluorescence holography. The separate atomic images of nearest Pb around Nb revealed acute and obtuse rhombohedral structures of the crystal unit cells. The Pb-Pb correla... [Phys. Rev. B 89, 140103] Published Tue Apr 29, 2014

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X-ray absorption spectroscopy of Ru-doped relaxor ferroelectrics with a perovskite-type structure (2014)

T. Vitova, S. Mangold, C. Paulmann, M. Gospodinov, V. Marinova, and B. Mihailova

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-30

Beschreibung: Author(s): T. Vitova, S. Mangold, C. Paulmann, M. Gospodinov, V. Marinova, and B. Mihailova X-ray absorption near-edge structure and extended x-ray absorption fine structure spectroscopy at the Ru K edge of Ru-doped PbSc0.5Ta0.5O3 (PST-Ru), PbSc0.5Nb0.5O3 (PSN-Ru), and 0.9PbZn1/3Nb2/3O3-0.1PbTiO3 (PZN-0.1PT-Ru) as well as at the Ta L3 edge of PST-Ru and the Nb K edge of PSN-Ru was applied ... [Phys. Rev. B 89, 144112] Published Tue Apr 29, 2014

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Subtle leakage of a Majorana mode into a quantum dot (2014)

E. Vernek, P. H. Penteado, A. C. Seridonio, and J. C. Egues

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): E. Vernek, P. H. Penteado, A. C. Seridonio, and J. C. Egues We investigate quantum transport through a quantum dot connected to source and drain leads and side coupled to a topological superconducting nanowire (Kitaev chain) sustaining Majorana end modes. Using a recursive Green's-function approach, we determine the local density of states of the system and ... [Phys. Rev. B 89, 165314] Published Wed Apr 30, 2014

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Ab initio (2014)

Daniel Cebulla and Ronald Redmer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-25

Beschreibung: Author(s): Daniel Cebulla and Ronald Redmer We determined the phase diagram of magnesium oxide with finite-temperature density functional theory molecular dynamics simulations up to temperatures and pressures as relevant for the deep interior of super-Earths and in rocky cores of giant planets such as Jupiter. The equation of state data, the ... [Phys. Rev. B 89, 134107] Published Thu Apr 24, 2014

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Hole transport and valence-band dispersion law in a HgTe quantum well with a normal energy spectrum (2014)

G. M. Minkov, A. V. Germanenko, O. E. Rut, A. A. Sherstobitov, S. A. Dvoretski, and N. N. Mikhailov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-25

Beschreibung: Author(s): G. M. Minkov, A. V. Germanenko, O. E. Rut, A. A. Sherstobitov, S. A. Dvoretski, and N. N. Mikhailov The results of an experimental study of the energy spectrum of a valence band in a HgTe quantum well of width d〈6.3 nm with normal spectrum in the presence of a strong spin-orbit splitting are reported. The analysis of the temperature, magnetic field, and gate voltage dependences of the Shubnikov... [Phys. Rev. B 89, 165311] Published Thu Apr 24, 2014

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Controlled formation of metastable germanium polymorphs (2014)

Bianca Haberl, Malcolm Guthrie, Brad D. Malone, Jesse S. Smith, Stanislav V. Sinogeikin, Marvin L. Cohen, James S. Williams, Guoyin Shen, and Jodie E. Bradby

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-26

Beschreibung: Author(s): Bianca Haberl, Malcolm Guthrie, Brad D. Malone, Jesse S. Smith, Stanislav V. Sinogeikin, Marvin L. Cohen, James S. Williams, Guoyin Shen, and Jodie E. Bradby The nucleation of metastable germanium polymorphs on decompression is studied using in situ synchrotron x-ray diffraction. We show that the transition pathway is critically dependent on the hydrostaticity. Quasihydrostatic conditions result in the nucleation of the rhombohedral r8 phase, followed by... [Phys. Rev. B 89, 144111] Published Fri Apr 25, 2014

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Doping Si nanocrystals embedded in SiO2 with P in the framework of density functional theory (2014)

Zhenyi Ni (倪朕伊), Xiaodong Pi (皮孝东), and Deren Yang (杨德仁)

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-25

Beschreibung: Author(s): Zhenyi Ni (倪朕伊), Xiaodong Pi (皮孝东), and Deren Yang (杨德仁) Despite the popularity of doping silicon nanocrystals (Si NCs) embedded in silicon dioxide (SiO2), theoretical understanding on the doping of Si NCs has been nearly all directed to hydrogen-passivated freestanding Si NCs. Now we simulate the doping of Si NCs embedded in SiO2 by constructing Si@SiO2 ... [Phys. Rev. B 89, 035312] Published Fri Jan 24, 2014

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Type-II band alignment of zinc-blende and wurtzite segments in GaAs nanowires: A combined photoluminescence and resonant Raman scattering study (2014)

Patryk Kusch, Eugen Grelich, Claudio Somaschini, Esperanza Luna, Manfred Ramsteiner, Lutz Geelhaar, Henning Riechert, and Stephanie Reich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-28

Beschreibung: Author(s): Patryk Kusch, Eugen Grelich, Claudio Somaschini, Esperanza Luna, Manfred Ramsteiner, Lutz Geelhaar, Henning Riechert, and Stephanie Reich We used spatially resolved photoluminescence (PL) and resonant Raman spectroscopy to study the electronic structure of single GaAs nanowires (NWs) consisting of zinc-blende (ZB) and wurtzite (WZ) segments. For narrow ZB segments and stacking faults the energy range of the observed PL peak positions ... [Phys. Rev. B 89, 045310] Published Mon Jan 27, 2014

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Energetics and nucleation of point defects in aluminum under extreme tensile hydrostatic stresses (2014)

Mrinal Iyer, Vikram Gavini, and Tresa M. Pollock

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-29

Beschreibung: Author(s): Mrinal Iyer, Vikram Gavini, and Tresa M. Pollock Density functional theory calculations are employed to investigate the energetics of point defects—monovacancy, self-interstitials (tetrahedral, octahedral, and dumbbell), and Frenkel pairs—in aluminum under tensile hydrostatic stresses. Our study suggests that the defect core energy of a vacancy, w... [Phys. Rev. B 89, 014108] Published Tue Jan 28, 2014

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Effects of nonuniform Mn distribution in (Ga,Mn)As (2014)

I. Ulfat, J. Kanski, L. Ilver, J. Sadowski, K. Karlsson, A. Ernst, and L. Sandratskii

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-30

Beschreibung: Author(s): I. Ulfat, J. Kanski, L. Ilver, J. Sadowski, K. Karlsson, A. Ernst, and L. Sandratskii Resonant in situ photoemission from Mn 3d states in Ga1−xMnxAs is reported for Mn concentrations down to the very dilute level of 0.1%. Concentration-dependent spectral features are analyzed on the basis of first-principles calculations for systems with selected impurity positions as well as for ran... [Phys. Rev. B 89, 045312] Published Wed Jan 29, 2014

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Observation of bound and antibound states of cavity polariton pairs in a CuCl microcavity (2014)

S. Matsuura, Y. Mitsumori, H. Kosaka, K. Edamatsu, K. Miyazaki, D. Kim, M. Nakayama, G. Oohata, H. Oka, H. Ajiki, and H. Ishihara

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-01

Beschreibung: Author(s): S. Matsuura, Y. Mitsumori, H. Kosaka, K. Edamatsu, K. Miyazaki, D. Kim, M. Nakayama, G. Oohata, H. Oka, H. Ajiki, and H. Ishihara We observed the antibound state, as well as the bound state, for cavity polariton pairs in a planar CuCl microcavity by spectrally resolved four-wave mixing. We obtained dispersion curves of the bound and antibound states by changing the incident angle of the pump pulses corresponding to the cavity ... [Phys. Rev. B 89, 035317] Published Fri Jan 31, 2014

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Circularly polarized light emission from chiral spatially-structured planar semiconductor microcavities (2014)

A. A. Maksimov, I. I. Tartakovskii, E. V. Filatov, S. V. Lobanov, N. A. Gippius, S. G. Tikhodeev, C. Schneider, M. Kamp, S. Maier, S. Höfling, and V. D. Kulakovskii

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-01

Beschreibung: Author(s): A. A. Maksimov, I. I. Tartakovskii, E. V. Filatov, S. V. Lobanov, N. A. Gippius, S. G. Tikhodeev, C. Schneider, M. Kamp, S. Maier, S. Höfling, and V. D. Kulakovskii We demonstrate a method for control of the polarization of emission of quantum dots (QDs) embedded in an active layer of a planar microcavity. This method involves a modification of the electromagnetic mode structure in a planar microcavity which is achieved by fabrication of a chiral gammadion laye... [Phys. Rev. B 89, 045316] Published Fri Jan 31, 2014

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Spin noise in the anisotropic central spin model (2014)

Johannes Hackmann and Frithjof B. Anders

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-01

Beschreibung: Author(s): Johannes Hackmann and Frithjof B. Anders Spin-noise measurements can serve as a direct probe for the microscopic decoherence mechanism of an electronic spin in semiconductor quantum dots (QDs). We have calculated the spin-noise spectrum in the anisotropic central spin model using a Chebyshev expansion technique which exactly accounts for t... [Phys. Rev. B 89, 045317] Published Fri Jan 31, 2014

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Landau theory for stress-induced order-disorder transitions in phase change materials (2014)

Matthias Thielen, Razvan A. Nistor, Dmitryi Shakhvorostov, Guillermo Beltramo, Margret Giesen, and Martin H. Müser

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-04

Beschreibung: Author(s): Matthias Thielen, Razvan A. Nistor, Dmitryi Shakhvorostov, Guillermo Beltramo, Margret Giesen, and Martin H. Müser We propose a Landau theory for phase change materials (PCMs), which describes stress-induced amorphization in vacancy-free, ordered PCMs as a condensation of defects in analogy to equilibrium gas-liquid transitions. Three dimensionless parameters suffice to deduce a highly accurate equation of state... [Phys. Rev. B 89, 054101] Published Mon Feb 03, 2014

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Giant enhancement of spin detection sensitivity in (Ga,Mn)As/GaAs Esaki diodes (2014)

Junichi Shiogai, Mariusz Ciorga, Martin Utz, Dieter Schuh, Makoto Kohda, Dominique Bougeard, Tsutomu Nojima, Junsaku Nitta, and Dieter Weiss

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-22

Beschreibung: Author(s): Junichi Shiogai, Mariusz Ciorga, Martin Utz, Dieter Schuh, Makoto Kohda, Dominique Bougeard, Tsutomu Nojima, Junsaku Nitta, and Dieter Weiss We investigate the correlation between spin signals measured in three-terminal (3T) geometry by the Hanle effect and the spin accumulation generated in a semiconductor channel in a lateral (Ga,Mn)As/GaAs Esaki diode device. We systematically compare measurements using a 3T configuration, probing spi... [Phys. Rev. B 89, 081307] Published Fri Feb 21, 2014

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Peierls distortion, magnetism, and high hardness of manganese tetraboride (2014)

Huiyang Gou, Alexander A. Tsirlin, Elena Bykova, Artem M. Abakumov, Gustaaf Van Tendeloo, Asta Richter, Sergey V. Ovsyannikov, Alexander V. Kurnosov, Dmytro M. Trots, Zuzana Konôpková, Hans-Peter Liermann, Leonid Dubrovinsky, and Natalia Dubrovinskaia

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-25

Beschreibung: Author(s): Huiyang Gou, Alexander A. Tsirlin, Elena Bykova, Artem M. Abakumov, Gustaaf Van Tendeloo, Asta Richter, Sergey V. Ovsyannikov, Alexander V. Kurnosov, Dmytro M. Trots, Zuzana Konôpková, Hans-Peter Liermann, Leonid Dubrovinsky, and Natalia Dubrovinskaia We report crystal structure, electronic structure, and magnetism of manganese tetraboride, MnB4, synthesized under high-pressure, high-temperature conditions. In contrast to superconducting FeB4 and metallic CrB4, which are both orthorhombic, MnB4 features a monoclinic crystal structure. Its lower s... [Phys. Rev. B 89, 064108] Published Mon Feb 24, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Pinning modes of high-magnetic-field Wigner solids with controlled alloy disorder (2014)

B.-H. Moon, L. W. Engel, D. C. Tsui, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-25

Beschreibung: Author(s): B.-H. Moon, L. W. Engel, D. C. Tsui, L. N. Pfeiffer, and K. W. West For a series of samples with two-dimensional electron systems in dilute AlxGa1−xAs, with varying x from 0% to 0.85%, we survey the pinning mode resonances of Wigner solids at the low Landau filling termination of the fractional quantum Hall effect series. For all x studied, the pinning modes are pre... [Phys. Rev. B 89, 075310] Published Mon Feb 24, 2014

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Refrigerator based on the Coulomb barrier for single-electron tunneling (2014)

Jukka P. Pekola, Jonne V. Koski, and Dmitri V. Averin

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In: Physical Review B

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Publikationsdatum: 2014-02-25

Beschreibung: Author(s): Jukka P. Pekola, Jonne V. Koski, and Dmitri V. Averin We propose a remarkably simple electronic refrigerator based on the Coulomb barrier for single-electron tunneling. A fully normal single-electron transistor is voltage V biased at a gate position such that tunneling through one of the junctions costs an energy of about kBT≪eV,EC, where T is the temp... [Phys. Rev. B 89, 081309] Published Mon Feb 24, 2014

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Spin blockade in a double quantum dot containing three electrons (2014)

S. Amaha, W. Izumida, T. Hatano, S. Tarucha, K. Kono, and K. Ono

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-08

Beschreibung: Author(s): S. Amaha, W. Izumida, T. Hatano, S. Tarucha, K. Kono, and K. Ono The realization of a high spin state, which is related to ferromagnetism and molecular magnetism, has been an attractive research topic. Here, using the nonequilibrium condition, we realize a high population of the quadruplet states (total spin S = 3/2) in a double quantum dot containing three elect... [Phys. Rev. B 89, 085302] Published Fri Feb 07, 2014

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Charge dynamics in molecular junctions: Nonequilibrium Green's function approach made fast (2014)

S. Latini, E. Perfetto, A.-M. Uimonen, R. van Leeuwen, and G. Stefanucci

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-12

Beschreibung: Author(s): S. Latini, E. Perfetto, A.-M. Uimonen, R. van Leeuwen, and G. Stefanucci Real-time Green's function simulations of molecular junctions (open quantum systems) are typically performed by solving the Kadanoff-Baym equations (KBE). The KBE, however, impose a serious limitation on the maximum propagation time due to the large memory storage needed. In this work we propose a s... [Phys. Rev. B 89, 075306] Published Tue Feb 11, 2014

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Electronic states of wires and slabs of topological insulators: Quantum Hall effects and edge transport (2014)

L. Brey and H. A. Fertig

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In: Physical Review B

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Publikationsdatum: 2014-02-12

Beschreibung: Author(s): L. Brey and H. A. Fertig We develop a simple model of surface states for topological insulators, developing matching relations for states on surfaces of different orientations. The model allows one to write simple Dirac Hamiltonians for each surface, and to determine how perturbations that couple to electron spin impact the... [Phys. Rev. B 89, 085305] Published Tue Feb 11, 2014

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Fermi contour anisotropy of GaAs electron-flux composite fermions in parallel magnetic fields (2014)

D. Kamburov, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin, J. J. D. Lee, and R. Winkler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-12

Beschreibung: Author(s): D. Kamburov, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin, J. J. D. Lee, and R. Winkler In high-quality two-dimensional electrons confined to GaAs quantum wells, near Landau level filling factors ν=1/2 and 1/4, we observe signatures of the commensurability of the electron-flux composite fermion cyclotron orbits with a unidirectional periodic density modulation. Focusing on the data nea... [Phys. Rev. B 89, 085304] Published Tue Feb 11, 2014

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Defect thermodynamics and kinetics in thin strained ferroelectric films: The interplay of possible mechanisms (2014)

Anna N. Morozovska, Eugene A. Eliseev, P. S. Sankara Rama Krishnan, Alexander Tselev, Evgheny Strelkov, Albina Borisevich, Olexander V. Varenyk, Nicola V. Morozovsky, Paul Munroe, Sergei V. Kalinin, and Valanoor Nagarajan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-14

Beschreibung: Author(s): Anna N. Morozovska, Eugene A. Eliseev, P. S. Sankara Rama Krishnan, Alexander Tselev, Evgheny Strelkov, Albina Borisevich, Olexander V. Varenyk, Nicola V. Morozovsky, Paul Munroe, Sergei V. Kalinin, and Valanoor Nagarajan We present a theoretical description of the influence of misfit strain on mobile defects dynamics in thin strained ferroelectric films. Self-consistent solutions obtained by coupling the Poisson's equation for electric potential with continuity equations for mobile donor and electron concentrations ... [Phys. Rev. B 89, 054102] Published Thu Feb 13, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Microscopic theory of the optical properties of colloidal graphene quantum dots (2014)

Isil Ozfidan, Marek Korkusinski, A. Devrim Güçlü, John A. McGuire, and Pawel Hawrylak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-22

Beschreibung: Author(s): Isil Ozfidan, Marek Korkusinski, A. Devrim Güçlü, John A. McGuire, and Pawel Hawrylak We present a microscopic theory of electronic and optical properties of colloidal graphene quantum dots (CGQDs). The single-particle properties are described in the tight-binding model based on the pz carbon orbitals. Electron-electron screened Coulomb direct, exchange, and scattering matrix element... [Phys. Rev. B 89, 085310] Published Fri Feb 21, 2014

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Effect of anisotropic spin absorption on the Hanle effect in lateral spin valves (2014)

H. Idzuchi, Y. Fukuma, S. Takahashi, S. Maekawa, and Y. Otani

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-22

Beschreibung: Author(s): H. Idzuchi, Y. Fukuma, S. Takahashi, S. Maekawa, and Y. Otani We have succeeded in fully describing dynamic properties of spin current including the different spin absorption mechanisms for longitudinal and transverse spins in lateral spin valves, which enable one to elucidate intrinsic spin transport and relaxation mechanisms in the nonmagnet. The deduced spi... [Phys. Rev. B 89, 081308] Published Fri Feb 21, 2014

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Spin relaxation in a zinc-blende (110) symmetric quantum well with δ doping (2014)

Hiroshi Akera, Hidekatsu Suzuura, and Yoshiyuki Egami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-02-27

Beschreibung: Author(s): Hiroshi Akera, Hidekatsu Suzuura, and Yoshiyuki Egami The spin relaxation of a two-dimensional electron system (2DES) formed in a symmetric quantum well is studied theoretically when the quantum well is parallel to the (110) plane of the zinc-blende structure, the spin polarization is perpendicular to the well, and electrons occupy only the ground subb... [Phys. Rev. B 89, 075314] Published Wed Feb 26, 2014

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Electric-field-induced transformations in epitaxial relaxor ferroelectric PbMg1/3Nb2/3O3 films (2014)

M. Tyunina, I. Pintilie, A. Iuga, and L. Pintilie

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-25

Beschreibung: Author(s): M. Tyunina, I. Pintilie, A. Iuga, and L. Pintilie Electric-field-induced transformations are studied experimentally in cube-on-cube-type epitaxial film of relaxor ferroelectric (FE) PbMg1/3Nb2/3O3 grown on (001) MgO substrate. The dielectric response, polarization, and current are measured along the out-of-plane 〈100〉 direction of the film and anal... [Phys. Rev. B 89, 094106] Published Mon Mar 24, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Photoluminescence fine structures in the fractional quantum Hall effect regime (2014)

S. Nomura, M. Yamaguchi, H. Tamura, T. Akazaki, Y. Hirayama, M. Korkusinski, and P. Hawrylak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-26

Beschreibung: Author(s): S. Nomura, M. Yamaguchi, H. Tamura, T. Akazaki, Y. Hirayama, M. Korkusinski, and P. Hawrylak We investigate polarization-resolved fine structure in the photoluminescence (PL) in the fractional quantum Hall effect regime at B=4–6 T, where small Zeeman energy allows spin-depolarized ground states. We observe up to five distinct peaks with characteristic polarization and temperature dependence... [Phys. Rev. B 89, 115317] Published Tue Mar 25, 2014

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Ballistic spin resonance in multisubband quantum wires (2014)

Marco O. Hachiya, Gonzalo Usaj, and J. Carlos Egues

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-26

Beschreibung: Author(s): Marco O. Hachiya, Gonzalo Usaj, and J. Carlos Egues Ballistic spin resonance was experimentally observed in a quasi-one-dimensional wire by Frolov et al. [Nature (London) 458 , 868 (2009)NATUAS10.1038/nature07873]. The spin resonance was generated by a combination of an external static magnetic field and the oscillating effective spin-orbit magnetic f... [Phys. Rev. B 89, 125310] Published Tue Mar 25, 2014

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Impact of n-type doping on the carrier dynamics of silicon nanowires studied using optical-pump terahertz-probe spectroscopy (2014)

A. Beaudoin, B. Salem, T. Baron, P. Gentile, and D. Morris

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-26

Beschreibung: Author(s): A. Beaudoin, B. Salem, T. Baron, P. Gentile, and D. Morris The n-doped and undoped silicon nanowires grown by chemical vapor deposition on quartz substrate were characterized using optical-pump terahertz-probe transmission experiments. Temporal decays of the differential transmission measurements are reproduced using a biexponential function with an initial... [Phys. Rev. B 89, 115316] Published Tue Mar 25, 2014

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Dynamic stabilization of cubic CaSiO3 perovskite at high temperatures and pressures from ab initio molecular dynamics (2014)

Tao Sun, Dong-Bo Zhang, and Renata M. Wentzcovitch

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-27

Beschreibung: Author(s): Tao Sun, Dong-Bo Zhang, and Renata M. Wentzcovitch The stability of cubic CaSiO3 perovskite (CaPv) at high temperatures and pressures is investigated by vibrational normal-mode analysis. We compute power spectra of mode autocorrelation functions using a recently developed hybrid approach combining ab initio molecular dynamics with lattice dynamics. ... [Phys. Rev. B 89, 094109] Published Wed Mar 26, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Unambiguous Gibbs dividing surface for nonequilibrium finite-width interface: Static equivalence approach (2014)

Valery I. Levitas

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-27

Beschreibung: Author(s): Valery I. Levitas The definition of all properties of the nonequilibrium interface depends on the choice of the position of the dividing surface. However, the definition of its position has been an unsolved problem for more than a century. A missing principle to unambiguously determine the position of the Gibbs' divi... [Phys. Rev. B 89, 094107] Published Wed Mar 26, 2014

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Nonequilibrium quantum criticality in open systems: The dissipation rate as an additional indispensable scaling variable (2014)

Shuai Yin, Peizhi Mai, and Fan Zhong

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-27

Beschreibung: Author(s): Shuai Yin, Peizhi Mai, and Fan Zhong We propose that nonequilibrium quantum criticality in open systems under the Born-Markov approximation can be described by a master equation of the Lindblad form. This master equation is derived from a system coupling weakly to a heat bath microscopically and is suggested to provide an approach to s... [Phys. Rev. B 89, 094108] Published Wed Mar 26, 2014

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Mechanisms of spin-dependent dark conductivity in films of a soluble fullerene derivative under bipolar injection (2014)

H. Morishita, W. J. Baker, D. P. Waters, R. Baarda, J. M. Lupton, and C. Boehme

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-27

Beschreibung: Author(s): H. Morishita, W. J. Baker, D. P. Waters, R. Baarda, J. M. Lupton, and C. Boehme We report room-temperature pulsed electrically detected magnetic resonance measurements of the dark conductivity of films of the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) under bipolar (electron-hole) and unipolar (electron-rich) injection conditions. Directly after mate... [Phys. Rev. B 89, 125311] Published Wed Mar 26, 2014

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Mechanisms of the paraelectric to ferroelectric phase transition in RbH2PO4 probed by purely resonant x-ray diffraction (2014)

C. Richter, D. V. Novikov, E. Kh. Mukhamedzhanov, M. M. Borisov, K. A. Akimova, E. N. Ovchinnikova, A. P. Oreshko, J. Strempfer, M. Zschornak, E. Mehner, D. C. Meyer, and V. E. Dmitrienko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-28

Beschreibung: Author(s): C. Richter, D. V. Novikov, E. Kh. Mukhamedzhanov, M. M. Borisov, K. A. Akimova, E. N. Ovchinnikova, A. P. Oreshko, J. Strempfer, M. Zschornak, E. Mehner, D. C. Meyer, and V. E. Dmitrienko Resonant x-ray diffraction was used to study the proton jumps in hydrogen-bonded rubidium dihydrogen phosphate (RDP) crystals. In the paraelectric RDP phase, hydrogen is delocalized between two crystallographically equivalent positions. At lower temperatures, this symmetry can be broken, which defin... [Phys. Rev. B 89, 094110] Published Thu Mar 27, 2014

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Critical differences in the surface electronic structure of Ge(001) and Si(001): Ab initio theory and angle-resolved photoemission spectroscopy (2014)

Hosung Seo, Richard C. Hatch, Patrick Ponath, Miri Choi, Agham B. Posadas, and Alexander A. Demkov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-28

Beschreibung: Author(s): Hosung Seo, Richard C. Hatch, Patrick Ponath, Miri Choi, Agham B. Posadas, and Alexander A. Demkov Even with renewed interest in Ge as a competitor to Si in field-effect transistors, several key features of the surface electronic structure of Ge(001) have remained controversial. Notably, the origin of strong Fermi-level pinning in Ge has been heavily debated. Using high-resolution angle-resolved ... [Phys. Rev. B 89, 115318] Published Thu Mar 27, 2014

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Origin of the energy level alignment at organic/organic interfaces: The role of structural defects (2014)

Fabio Bussolotti, Jinpeng Yang, Alexander Hinderhofer, Yuli Huang, Wei Chen, Satoshi Kera, Andrew T. S. Wee, and Nobuo Ueno

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-28

Beschreibung: Author(s): Fabio Bussolotti, Jinpeng Yang, Alexander Hinderhofer, Yuli Huang, Wei Chen, Satoshi Kera, Andrew T. S. Wee, and Nobuo Ueno In this paper, the electronic properties of as-deposited and N2-exposed CuPc/F16CuPc interface, a prototype system for organic photovoltaic applications, are investigated by using ultralow background, high-sensitivity photoemission spectroscopy. It is found that (i) N2 exposure significantly modifie... [Phys. Rev. B 89, 115319] Published Thu Mar 27, 2014

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Crystal electron binding energy and surface work function control of tin dioxide (2014)

Keith T. Butler, John Buckeridge, C. Richard A. Catlow, and Aron Walsh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-29

Beschreibung: Author(s): Keith T. Butler, John Buckeridge, C. Richard A. Catlow, and Aron Walsh The work function of a material is commonly used as an intrinsic reference for band alignment; however, it is notoriously susceptible to extrinsic conditions. Following the classification of Bardeen we calculate values for the bulk binding energy of electrons in rutile-structured SnO2 and the effect... [Phys. Rev. B 89, 115320] Published Fri Mar 28, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Symmetry-induced anyon breeding in fractional quantum Hall states (2014)

Yuan-Ming Lu and Lukasz Fidkowski

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-29

Beschreibung: Author(s): Yuan-Ming Lu and Lukasz Fidkowski An exotic feature of the fractional quantum Hall effect is the emergence of anyons, which are quasiparticle excitations with fractional statistics. In the presence of a symmetry, such as U(1) charge conservation, it is well known that anyons can carry fractional symmetry quantum numbers. In this pap... [Phys. Rev. B 89, 115321] Published Fri Mar 28, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Maximal tripartite entanglement between singlet-triplet qubits in quantum dots (2014)

Tuukka Hiltunen and Ari Harju

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-29

Beschreibung: Author(s): Tuukka Hiltunen and Ari Harju We propose an efficient three-qubit gate of singlet-triplet states in quantum dots based on capacitative coupling. This scheme can be used to generate the maximally entangled Greenberger-Horne-Zeilinger state with one simple gate operation. Our simulations using a realistic microscopic model combine... [Phys. Rev. B 89, 115322] Published Fri Mar 28, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Intrinsic LiNbO3 point defects from hybrid density functional calculations (2014)

Yanlu Li, W. G. Schmidt, and S. Sanna

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-01

Beschreibung: Author(s): Yanlu Li, W. G. Schmidt, and S. Sanna The formation energies and charge transition levels of the most relevant LiNbO3 intrinsic point defects, i.e., Nb antisites and Li as well Nb vacancies, are studied from first principles. Thereby isolated defects are modeled in the framework of the density functional theory with local and hybrid exc... [Phys. Rev. B 89, 094111] Published Mon Mar 31, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Quantum hexatic order in two-dimensional dipolar and charged fluids (2014)

Georg M. Bruun and David R. Nelson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-01

Beschreibung: Author(s): Georg M. Bruun and David R. Nelson Recent advances in cold atom experimentation suggest that studies of quantum two-dimensional melting of dipolar molecules, with dipoles aligned perpendicular to ordering plane, may be on the horizon. An intriguing aspect of this problem is that two-dimensional classical aligned dipoles (already stud... [Phys. Rev. B 89, 094112] Published Mon Mar 31, 2014

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Quantitative determination of the Mn site distribution in ultrathin Ga0.80Mn0.20As layers with high critical temperatures: A Rutherford backscattering channeling investigation (2014)

D. Benzeggouta, Kh. Khazen, I. Vickridge, H. J. von Bardeleben, L. Chen, X. Z. Yu, and J. H. Zhao

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-01

Beschreibung: Author(s): D. Benzeggouta, Kh. Khazen, I. Vickridge, H. J. von Bardeleben, L. Chen, X. Z. Yu, and J. H. Zhao The Mn dopant distribution in ultrathin (20 nm) highly doped (nominal x = 0.20) Ga1−xMnxAs epitaxial films with critical temperatures close to 175 K and magnetization of 100 emu/cm3 is analyzed by Rutherford backscattering spectrometry (RBS) in a random and channeling configuration. We could quantif... [Phys. Rev. B 89, 115323] Published Mon Mar 31, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Strong angular magneto-induced anisotropy of Voigt effect in metal-dielectric metamaterials with periodic nanostructures (2014)

Yakov M. Strelniker and David J. Bergman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-01

Beschreibung: Author(s): Yakov M. Strelniker and David J. Bergman When an applied magnetic field has an arbitrary direction with respect to the lattice axes of a periodically microstructured or nanostructured metamaterial, the effective permittivity tensor of the metamaterial sample becomes anisotropic and all its components can be nonzero. This is true even if th... [Phys. Rev. B 89, 125312] Published Mon Mar 31, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Magnetic control of Coulomb scattering and terahertz transitions among excitons (2014)

J. Bhattacharyya, S. Zybell, F. Eßer, M. Helm, H. Schneider, L. Schneebeli, C. N. Böttge, B. Breddermann, M. Kira, S. W. Koch, A. M. Andrews, and G. Strasser

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-01

Beschreibung: Author(s): J. Bhattacharyya, S. Zybell, F. Eßer, M. Helm, H. Schneider, L. Schneebeli, C. N. Böttge, B. Breddermann, M. Kira, S. W. Koch, A. M. Andrews, and G. Strasser Time-resolved terahertz quenching studies of the magnetoexcitonic photoluminescence from GaAs/AlGaAs quantum wells are performed. A microscopic theory is developed to analyze the experiments. Detailed experiment-theory comparisons reveal a remarkable magnetic-field controllability of the Coulomb and... [Phys. Rev. B 89, 125313] Published Mon Mar 31, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Scaling of genuine multiparticle entanglement close to a quantum phase transition (2014)

Martin Hofmann, Andreas Osterloh, and Otfried Gühne

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-03

Beschreibung: Author(s): Martin Hofmann, Andreas Osterloh, and Otfried Gühne We investigate the scaling and spatial distribution of genuine multiparticle entanglement in three- and four-spin reduced states of the one-dimensional XY model at the quantum phase transition. We observe a logarithmic divergence, show that genuine three- and four-particle entanglement obeys finite-... [Phys. Rev. B 89, 134101] Published Wed Apr 02, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Chiral selectivity of improper ferroelectricity in single-wall PbTiO3 nanotubes (2014)

Jie Wang, Tao Xu, Takahiro Shimada, Xiaoyuan Wang, Tong-Yi Zhang, and Takayuki Kitamura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-03

Beschreibung: Author(s): Jie Wang, Tao Xu, Takahiro Shimada, Xiaoyuan Wang, Tong-Yi Zhang, and Takayuki Kitamura Full density functional theory calculations successfully demonstrate that a remarkable spontaneous polarization can stably exist in extremely thin PbTiO3 single-wall nanotubes (PTO-SWNTs) folded from (110) nanosheets with a specific chirality of (m, 0), whereas ferroelectricity is absent from nanotu... [Phys. Rev. B 89, 144102] Published Wed Apr 02, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Structure and compressibility of the high-pressure molecular phase II of carbon dioxide (2014)

Frédéric Datchi, Bidyut Mallick, Ashkan Salamat, Gwenaëlle Rousse, Sandra Ninet, Gaston Garbarino, Pierre Bouvier, and Mohamed Mezouar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-03

Beschreibung: Author(s): Frédéric Datchi, Bidyut Mallick, Ashkan Salamat, Gwenaëlle Rousse, Sandra Ninet, Gaston Garbarino, Pierre Bouvier, and Mohamed Mezouar The structure and equation of state of the crystalline molecular phase II of carbon dioxide have been investigated at room temperature from 15.5 to 57.5 GPa using synchrotron x-ray diffraction methods. The CO2 samples were embedded in neon pressure medium in order to provide quasihydrostatic conditi... [Phys. Rev. B 89, 144101] Published Wed Apr 02, 2014

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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