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Nonlocal transport via edge states in InAs/GaSb coupled quantum wells (2015)

Susanne Mueller, Atindra Nath Pal, Matija Karalic, Thomas Tschirky, Christophe Charpentier, Werner Wegscheider, Klaus Ensslin, and Thomas Ihn

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Susanne Mueller, Atindra Nath Pal, Matija Karalic, Thomas Tschirky, Christophe Charpentier, Werner Wegscheider, Klaus Ensslin, and Thomas Ihn We have investigated low-temperature electronic transport on InAs/GaSb double quantum wells, a system which promises to be electrically tunable from a normal to a topological insulator. Hall bars of 50 μ m in length down to a few micrometers gradually develop a pronounced resistance plateau near charg… [Phys. Rev. B 92, 081303(R)] Published Mon Aug 10, 2015

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Confinement of spin-orbit induced Dirac states in quantum point contacts (2015)

Tommy Li

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Tommy Li The quantum transmission problem for a particle moving in a quantum point contact in the presence of a Rashba spin-orbit interaction and applied magnetic field is solved semiclassically. A strong Rashba interaction and parallel magnetic field form emergent Dirac states at the center of the constrict… [Phys. Rev. B 92, 085302] Published Mon Aug 10, 2015

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Giant spin-orbit-induced spin splitting in Bi zigzag chains on GaAs(110) (2015)

Hyun-Jung Kim and Jun-Hyung Cho

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Hyun-Jung Kim and Jun-Hyung Cho The search for one-dimensional electron systems with a giant Rashba-type spin splitting is of importance for the application of spin transport. Here we report, based on a first-principles density-functional-theory calculation, that Bi zigzag chains formed on a heterogeneous GaAs(110) surface have a … [Phys. Rev. B 92, 085303] Published Mon Aug 10, 2015

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Size-dependent line broadening in the emission spectra of single GaAs quantum dots: Impact of surface charge on spectral diffusion (2015)

Neul Ha, Takaaki Mano, Ying-Lin Chou, Yu-Nien Wu, Shun-Jen Cheng, Juanita Bocquel, Paul M. Koenraad, Akihiro Ohtake, Yoshiki Sakuma, Kazuaki Sakoda, and Takashi Kuroda

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Neul Ha, Takaaki Mano, Ying-Lin Chou, Yu-Nien Wu, Shun-Jen Cheng, Juanita Bocquel, Paul M. Koenraad, Akihiro Ohtake, Yoshiki Sakuma, Kazuaki Sakoda, and Takashi Kuroda Making use of droplet epitaxy, we systematically controlled the height of self-assembled GaAs quantum dots by more than one order of magnitude. The photoluminescence spectra of single quantum dots revealed the strong dependence of the spectral linewidth on the dot height. Tall dots with a height of … [Phys. Rev. B 92, 075306] Published Mon Aug 10, 2015

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First-principles embedded-cluster calculations of the neutral and charged oxygen vacancy at the rutile TiO_{2} (110) surface (2015)

Daniel Berger, Harald Oberhofer, and Karsten Reuter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-12

Description: Author(s): Daniel Berger, Harald Oberhofer, and Karsten Reuter We perform full-potential screened-hybrid density-functional theory calculations to compare the thermodynamic stability of neutral and charged states of the surface oxygen vacancy at the rutile TiO 2 (110) surface. Solid-state (QM/MM) embedded-cluster calculations are employed to account for the stron… [Phys. Rev. B 92, 075308] Published Tue Aug 11, 2015

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Diamagnetism in wire medium metamaterials: Theory and experiment (2015)

I. Yagupov, D. Filonov, A. Ageyskiy, S. Kosulnikov, M. Hasan, I. V. Iorsh, and P. A. Belov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-07-30

Description: Author(s): I. Yagupov, D. Filonov, A. Ageyskiy, S. Kosulnikov, M. Hasan, I. V. Iorsh, and P. A. Belov A strong diamagnetic response of a wire medium with a finite wire radius is reported. Contrary to the previous works where it was assumed that the wire medium exhibits only an electric response, we show that the nonzero magnetic susceptibility has to be taken into account for a proper effective medi… [Phys. Rev. B 92, 041304(R)] Published Wed Jul 29, 2015

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Phonon thermoelectric transistors and rectifiers (2015)

Jian-Hua Jiang, Manas Kulkarni, Dvira Segal, and Yoseph Imry

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-07-30

Description: Author(s): Jian-Hua Jiang, Manas Kulkarni, Dvira Segal, and Yoseph Imry We describe nonlinear phonon-thermoelectric devices where charge current and electronic and phononic heat currents are coupled, driven by voltage and temperature biases, when phonon-assisted inelastic processes dominate the transport. Our thermoelectric transistors and rectifiers can be realized in … [Phys. Rev. B 92, 045309] Published Wed Jul 29, 2015

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Orbital Kondo effect in fractional quantum Hall systems (2015)

Yashar Komijani, Pascal Simon, and Ian Affleck

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-04

Description: Author(s): Yashar Komijani, Pascal Simon, and Ian Affleck We study the transport properties of a charge qubit coupling two chiral Luttinger liquids, realized by two antidots placed between the edges of an integer ν = 1 or fractional ν = 1 / 3 quantum Hall bar. We show that in the limit of a large capacitive coupling between the antidots, their quasiparticle occu… [Phys. Rev. B 92, 075301] Published Mon Aug 03, 2015

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Fast long-distance control of spin qubits by photon-assisted cotunneling (2015)

Peter Stano, Jelena Klinovaja, Floris R. Braakman, Lieven M. K. Vandersypen, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-06

Description: Author(s): Peter Stano, Jelena Klinovaja, Floris R. Braakman, Lieven M. K. Vandersypen, and Daniel Loss We investigate theoretically the long-distance coupling and spin exchange in an array of quantum dot spin qubits in the presence of microwaves. We find that photon-assisted cotunneling is boosted at resonances between photon and energies of virtually occupied excited states and show how to make it s… [Phys. Rev. B 92, 075302] Published Tue Aug 04, 2015

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Generation of entangled photon strings using NV centers in diamond (2015)

D. D. Bhaktavatsala Rao, Sen Yang, and Jörg Wrachtrup

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): D. D. Bhaktavatsala Rao, Sen Yang, and Jörg Wrachtrup We present a scheme to generate entangled photons using nitrogen vacancy (NV) centers in diamond. We show how the long-lived nuclear spin in diamond can mediate entanglement between multiple photons, thereby increasing the length of the entangled photon string. With the proposed scheme one could gen… [Phys. Rev. B 92, 081301(R)] Published Thu Aug 06, 2015

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Large linear magnetoresistance in Dirac semimetal Cd_{3} As_{2} with Fermi surfaces close to the Dirac points (2015)

Junya Feng, Yuan Pang, Desheng Wu, Zhijun Wang, Hongming Weng, Jianqi Li, Xi Dai, Zhong Fang, Youguo Shi, and Li Lu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-20

Description: Author(s): Junya Feng, Yuan Pang, Desheng Wu, Zhijun Wang, Hongming Weng, Jianqi Li, Xi Dai, Zhong Fang, Youguo Shi, and Li Lu We investigated the magnetoresistive behavior of an ideal Dirac semimetal—high-quality single crystals of Cd 3 As 2 with a Fermi level very close to the Dirac point. A large linear magnetoresistance (LMR), up to 3100% in a magnetic field of 14 T, was observed at a temperature of T = 2 K . The detailed fiel… [Phys. Rev. B 92, 081306(R)] Published Wed Aug 19, 2015

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Antiferromagnetic structures and electronic energy levels at reconstructed NiO(111) surfaces: A DFT+U study (2015)

Lesheng Li and Yosuke Kanai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-06

Description: Author(s): Lesheng Li and Yosuke Kanai We studied how the surface reconstruction and passivation influence the antiferromagnetic and electronic structures of NiO(111) surface using first-principles electronic structure calculations. These features lead to a surprisingly wide variety of different surface electronic structures, and some su... [Phys. Rev. B 91, 235304] Published Wed Jun 03, 2015

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Optical signatures of spin-dependent coupling in semimagnetic quantum dot molecules (2015)

Ł. Kłopotowski, P. Wojnar, Ł. Cywiński, T. Jakubczyk, M. Goryca, K. Fronc, T. Wojtowicz, and G. Karczewski

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-06

Description: Author(s): Ł. Kłopotowski, P. Wojnar, Ł. Cywiński, T. Jakubczyk, M. Goryca, K. Fronc, T. Wojtowicz, and G. Karczewski We present photoluminescence studies of CdTe and Cd 1 − x Mn x Te quantum dots grown in two adjacent layers. We show that when the dots are 8 nm apart, their magneto-optical properties—Zeeman shifts and transition linewidths—are analogous to those of individual CdTe or Cd 1 − x Mn x Te dots. When the dots are g… [Phys. Rev. B 92, 075303] Published Tue Aug 04, 2015

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Tight-binding analysis of Si and GaAs ultrathin bodies with subatomic wave-function resolution (2015)

Yaohua P. Tan, Michael Povolotskyi, Tillmann Kubis, Timothy B. Boykin, and Gerhard Klimeck

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-06

Description: Author(s): Yaohua P. Tan, Michael Povolotskyi, Tillmann Kubis, Timothy B. Boykin, and Gerhard Klimeck Empirical tight-binding (ETB) methods are widely used in atomistic device simulations. Traditional ways of generating the ETB parameters rely on direct fitting to bulk experiments or theoretical electronic bands. However, ETB calculations based on existing parameters lead to unphysical results in ul… [Phys. Rev. B 92, 085301] Published Tue Aug 04, 2015

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Nonlinear spin transport in a rectifying ferromagnet/semiconductor Schottky contact (2015)

R. Jansen, A. Spiesser, H. Saito, and S. Yuasa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): R. Jansen, A. Spiesser, H. Saito, and S. Yuasa The electrical creation and detection of spin accumulation in ferromagnet/semiconductor Schottky contacts that exhibit highly nonlinear and rectifying electrical transport is evaluated. If the spin accumulation in the semiconductor is small, the expression for the spin voltage is identical to that o… [Phys. Rev. B 92, 075304] Published Thu Aug 06, 2015

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Polarization-correlated photons from a positively charged quantum dot (2015)

Y. Cao, A. J. Bennett, I. Farrer, D. A. Ritchie, and A. J. Shields

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): Y. Cao, A. J. Bennett, I. Farrer, D. A. Ritchie, and A. J. Shields Polarized cross-correlation spectroscopy on a quantum dot charged with a single hole shows the sequential emission of photons with common circular polarization. This effect is visible without magnetic field, but becomes more pronounced as the field along the quantization axis is increased. We interp… [Phys. Rev. B 92, 081302(R)] Published Fri Aug 07, 2015

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Dynamical optical tuning of the coherent phonon detection sensitivity in DBR-based GaAs optomechanical resonators (2015)

P. Sesin, P. Soubelet, V. Villafañe, A. E. Bruchhausen, B. Jusserand, A. Lemaître, N. D. Lanzillotti-Kimura, and A. Fainstein

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-12

Description: Author(s): P. Sesin, P. Soubelet, V. Villafañe, A. E. Bruchhausen, B. Jusserand, A. Lemaître, N. D. Lanzillotti-Kimura, and A. Fainstein We present a detailed time-resolved differential reflectivity study of the electronic and the coherent phonon generation response of a GaAs optical microcavity after resonant picosecond laser pulse excitation. A complex behavior is observed as a function of laser–cavity-mode detuning and incident po… [Phys. Rev. B 92, 075307] Published Tue Aug 11, 2015

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Theory of interacting topological crystalline insulators (2015)

Hiroki Isobe and Liang Fu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Hiroki Isobe and Liang Fu We study the effect of electron interactions in topological crystalline insulators (TCIs) protected by mirror symmetry, which are realized in the SnTe material class and host multivalley Dirac fermion surface states. We find that interactions reduce the integer classification of noninteracting TCIs … [Phys. Rev. B 92, 081304(R)] Published Mon Aug 10, 2015

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Strain-induced coherent dynamics of coupled carriers and Mn spins in a quantum dot (2015)

A. Lafuente-Sampietro, H. Boukari, and L. Besombes

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): A. Lafuente-Sampietro, H. Boukari, and L. Besombes We report on the coherent dynamics of the spin of an individual magnetic atom coupled to carriers in a semiconductor quantum dot which has been investigated by resonant photoluminescence of the positively charged exciton ( X + ) . We demonstrate that a positively charged CdTe/ZnTe quantum dot doped with… [Phys. Rev. B 92, 081305(R)] Published Mon Aug 10, 2015

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Dissipative soliton protocols in semiconductor microcavities at finite temperatures (2015)

D. V. Karpov, I. G. Savenko, H. Flayac, and N. N. Rosanov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): D. V. Karpov, I. G. Savenko, H. Flayac, and N. N. Rosanov We consider exciton polaritons in a semiconductor microcavity with a saturable absorber in the growth direction of the heterostructure. This feature promotes additional nonlinear losses of the system with the emergence of bistability of the condensate particles number on the nonresonant (electrical … [Phys. Rev. B 92, 075305] Published Mon Aug 10, 2015

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Nonmonotonically tunable Rashba spin-orbit coupling by multiple-band filling control in SrTiO_{3} -based interfacial d-electron gases (2015)

Haixing Liang, Long Cheng, Laiming Wei, Zhenlin Luo, Guolin Yu, Changgan Zeng, and Zhenyu Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-13

Description: Author(s): Haixing Liang, Long Cheng, Laiming Wei, Zhenlin Luo, Guolin Yu, Changgan Zeng, and Zhenyu Zhang Spin-orbit coupling (SOC) for d -electron gas can be substantially enriched compared with the s p -electron gas due to the delicate ordering of the multiple d subbands. Here, we demonstrate the nontrivial Rashba SOC effect at SrTiO 3 -based interfaces ( LaAlO 3 / SrTiO 3 and LaVO 3 / SrTiO 3 ) directly related to … [Phys. Rev. B 92, 075309] Published Wed Aug 12, 2015

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Magnetoresistance quantum oscillations in a magnetic two-dimensional electron gas (2015)

J. Kunc, B. A. Piot, D. K. Maude, M. Potemski, R. Grill, C. Betthausen, D. Weiss, V. Kolkovsky, G. Karczewski, and T. Wojtowicz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-13

Description: Author(s): J. Kunc, B. A. Piot, D. K. Maude, M. Potemski, R. Grill, C. Betthausen, D. Weiss, V. Kolkovsky, G. Karczewski, and T. Wojtowicz At low temperatures, the longitudinal resistivity of metallic systems exhibits quantum oscillations when submitted to a sufficiently high magnetic field. The authors report magneto-transport study of a high quality magnetic two-dimensional electron gas formed in a diluted magnetic CdMnTe quantum well. They find that the Shubnikov-de Haas characteristics is well-described by incorporating the electron Mn exchange interaction into the traditional Lifshitz-Kosevich formalism in a “mean field” approach. [Phys. Rev. B 92, 085304] Published Wed Aug 12, 2015

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Temperature-tunable semiconductor metamaterial (2015)

K. L. Koshelev and A. A. Bogdanov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-15

Description: Author(s): K. L. Koshelev and A. A. Bogdanov We propose a class of temperature-tunable semiconductor metamaterials for terahertz applications. These metamaterials are based on doped semiconductor superlattices with ultrathin barriers of about 1 nm thickness. Due to the tunnel transparency of the barriers, layers of the superlattice cannot be c… [Phys. Rev. B 92, 085305] Published Fri Aug 14, 2015

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Controlled tunneling-induced dephasing of Rabi rotations for high-fidelity hole spin initialization (2015)

P.-L. Ardelt, T. Simmet, K. Müller, C. Dory, K. A. Fischer, A. Bechtold, A. Kleinkauf, H. Riedl, and J. J. Finley

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-22

Description: Author(s): P.-L. Ardelt, T. Simmet, K. Müller, C. Dory, K. A. Fischer, A. Bechtold, A. Kleinkauf, H. Riedl, and J. J. Finley We report the subpicosecond initialization of a single heavy hole spin in a self-assembled quantum dot with 〉 98.5 % fidelity and without external magnetic field. Using an optically addressable charge and spin storage device we tailor the relative electron and hole tunneling escape time scales from… [Phys. Rev. B 92, 115306] Published Fri Sep 18, 2015

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High-fidelity initialization of long-lived quantum dot hole spin qubits by reduced fine-structure splitting (2015)

A. J. Brash, L. M. P. P. Martins, F. Liu, J. H. Quilter, A. J. Ramsay, M. S. Skolnick, and A. M. Fox

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-22

Description: Author(s): A. J. Brash, L. M. P. P. Martins, F. Liu, J. H. Quilter, A. J. Ramsay, M. S. Skolnick, and A. M. Fox We demonstrate an on-demand hole spin qubit initialization scheme meeting four key requirements of quantum information processing: fast initialization (1/e ∼ 100 ps), high fidelity ( F 〉 99 % ), long qubit lifetime ( 2 T h 〉 T 2 * ≃ 10 ns ), and compatibility with optical coherent control schemes. This is ach… [Phys. Rev. B 92, 121301(R)] Published Fri Sep 18, 2015

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Chiral electromagnetic waves in Weyl semimetals (2015)

Alexander A. Zyuzin and Vladimir A. Zyuzin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-25

Description: Author(s): Alexander A. Zyuzin and Vladimir A. Zyuzin We show that Weyl semimetals with broken time-reversal symmetry can host chiral electromagnetic waves. The magnetization that results in a momentum-space separation of a pair of opposite chirality Weyl nodes is also responsible for the nonzero gyrotropy parameter in the system. It is then shown that… [Phys. Rev. B 92, 115310] Published Wed Sep 23, 2015

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Electrical current from quantum vacuum fluctuations in nanoengines (2015)

Loïc Henriet, Andrew N. Jordan, and Karyn Le Hur

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-25

Description: Author(s): Loïc Henriet, Andrew N. Jordan, and Karyn Le Hur We theoretically investigate a quantum dot coupled to fermionic (electronic) leads and show how zero-point quantum fluctuations stemming from bosonic environments permit the rectification of the current. The bosonic baths are either external impedances modeled as tunable transmission lines or LC res… [Phys. Rev. B 92, 125306] Published Wed Sep 23, 2015

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Electron density magnification of the collective spin-orbit field in quantum wells (2015)

F. Baboux, F. Perez, C. A. Ullrich, G. Karczewski, and T. Wojtowicz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-29

Description: Author(s): F. Baboux, F. Perez, C. A. Ullrich, G. Karczewski, and T. Wojtowicz The spin-orbit field acting on the spin waves of a spin-polarized electron gas is studied by inelastic light scattering on a CdMnTe quantum well. Above-barrier illumination allows us to vary the electronic density and control the collective Rashba and Dresselhaus coupling constants. We demonstrate t… [Phys. Rev. B 92, 125307] Published Mon Sep 28, 2015

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Dynamical quantum depletion in polariton condensates (2015)

Selma Koghee and Michiel Wouters

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-11-26

Description: Author(s): Selma Koghee and Michiel Wouters We present a theoretical study of the quantum depletion of microcavity polaritons that are excited with a resonant laser pulse. The dynamics of the quantum fluctuations are interpreted in the context of quantum quenches in general and in terms of the dynamical Casimir effect in particular. We comput… [Phys. Rev. B 92, 195309] Published Tue Nov 24, 2015

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Interstitial iron impurities at cores of dissociated dislocations in silicon (2015)

Benedikt Ziebarth, Matous Mrovec, Christian Elsässer, and Peter Gumbsch

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-11-26

Description: Author(s): Benedikt Ziebarth, Matous Mrovec, Christian Elsässer, and Peter Gumbsch Dislocations play an important role in semiconductor devices made of crystalline silicon (Si). They are known to be strongly performance-limiting defects in solar cell applications, since they act as preferred segregation sites for metallic impurities. In this work we investigate the segregation of … [Phys. Rev. B 92, 195308] Published Tue Nov 24, 2015

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Controlling circular polarization of light emitted by quantum dots using chiral photonic crystal slabs (2015)

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-11-26

Description: Author(s): S. V. Lobanov, S. G. Tikhodeev, N. A. Gippius, A. A. Maksimov, E. V. Filatov, I. I. Tartakovskii, V. D. Kulakovskii, T. Weiss, C. Schneider, J. Geßler, M. Kamp, and S. Höfling We study the polarization properties of light emitted by quantum dots that are embedded in chiral photonic crystal structures made of achiral planar GaAs waveguides. A modification of the electromagnetic mode structure due to the chiral grating fabricated by partial etching of the waveguide layer ha… [Phys. Rev. B 92, 205309] Published Mon Nov 23, 2015

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Two-dimensional oxide topological insulator with iron-pnictide superconductor LiFeAs structure (2015)

Qiunan Xu, Zhida Song, Simin Nie, Hongming Weng, Zhong Fang, and Xi Dai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-11-26

Description: Author(s): Qiunan Xu, Zhida Song, Simin Nie, Hongming Weng, Zhong Fang, and Xi Dai By using first-principles calculations, we propose that ZrSiO can be looked at as a three-dimensional (3D) oxide weak topological insulator (TI) and its single layer is a long-sought-after 2D oxide TI with a band gap up to 30 meV. Calculated phonon spectrum of the single layer ZrSiO indicates it is … [Phys. Rev. B 92, 205310] Published Tue Nov 24, 2015

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Probing charge fluctuator correlations using quantum dot pairs (2015)

V. Purohit, B. Braunecker, and B. W. Lovett

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-02

Description: Author(s): V. Purohit, B. Braunecker, and B. W. Lovett We study a pair of quantum dot exciton qubits interacting with a number of fluctuating charges that can induce a Stark shift of both exciton transition energies. We do this by solving the optical master equation using a numerical transfer matrix method. We find that the collective influence of the c... [Phys. Rev. B 91, 245301] Published Mon Jun 01, 2015

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Topologically protected Dirac cones in compressed bulk black phosphorus (2015)

Ruixiang Fei, Vy Tran, and Li Yang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-05-29

Description: Author(s): Ruixiang Fei, Vy Tran, and Li Yang Using the k · p theory and first-principles simulations, we predict that applying a moderate uniaxial or hydrostatic pressure ( 〉 0.6 GPa ) on bulk or multilayer black phosphorus (BP) can diminish its bandgap and produce one-dimensional and even two-dimensional (2D) Dirac cones. Similar to topological ... [Phys. Rev. B 91, 195319] Published Wed May 27, 2015

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Comparative study of ab initio nonradiative recombination rate calculations under different formalisms (2015)

Lin Shi, Ke Xu, and Lin-Wang Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-05-29

Description: Author(s): Lin Shi, Ke Xu, and Lin-Wang Wang Nonradiative deep level carrier trapping, also known as the Shockley-Read-Hall effect, is an old and important problem in semiconductor physics. Five different possible formalisms, which have given very different results for calculations of the capture coefficients, are compared here with each other and with extant experimental results for two complex defect structures: GaP:Zn G a -O P and GaN:Zn G a -V N . The static coupling theory is shown to be in the best agreement with experiment and arguments are provided for why it should be used in calculations of nonradiative carrier recombination. [Phys. Rev. B 91, 205315] Published Wed May 27, 2015

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Observation of surface-state transport in ultrathin Sb (2015)

S. Cairns, N. Teasdale, J. Keay, C. K. Gaspe, K. S. Wickramasinghe, T. D. Mishima, M. B. Santos, and S. Q. Murphy

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-05-30

Description: Author(s): S. Cairns, N. Teasdale, J. Keay, C. K. Gaspe, K. S. Wickramasinghe, T. D. Mishima, M. B. Santos, and S. Q. Murphy We report magnetotransport studies of ultrathin Sb films. Sb has been identified as a topologically nontrivial element; as a semimetal, however, the interior states dominate the transport in bulk samples. In the ultrathin films studied here, quantum confinement suppresses the interior transport such... [Phys. Rev. B 91, 205317] Published Fri May 29, 2015

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Time-dependent stochastic Bethe-Salpeter approach (2015)

Eran Rabani, Roi Baer, and Daniel Neuhauser

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-02

Description: Author(s): Eran Rabani, Roi Baer, and Daniel Neuhauser A time-dependent formulation for electron-hole excitations in extended finite systems, based on the Bethe-Salpeter equation (BSE), is developed using a stochastic wave function approach. The time-dependent formulation builds on the connection between time-dependent Hartree-Fock (TDHF) theory and the... [Phys. Rev. B 91, 235302] Published Mon Jun 01, 2015

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Charge compressibility and quantum magnetic phase transition in MoS_{2} (2015)

Habib Rostami and Reza Asgari

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-02

Description: Author(s): Habib Rostami and Reza Asgari We investigate the ground-state properties of monolayer MoS 2 incorporating the Coulomb interaction together with a short-range intervalley interaction between charged particles between two valleys within the Hartree-Fock approximation. We consider four variables as independent parameters, namely, ho... [Phys. Rev. B 91, 235301] Published Mon Jun 01, 2015

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Spectroscopic studies of CdTe(111) bulk and surface electronic structure (2015)

Jie Ren, Li Fu, Guang Bian, Manhong Wong, Tao Wang, Gangqiang Zha, Wanqi Jie, T. Miller, M. Z. Hasan, and T.-C. Chiang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-02

Description: Author(s): Jie Ren, Li Fu, Guang Bian, Manhong Wong, Tao Wang, Gangqiang Zha, Wanqi Jie, T. Miller, M. Z. Hasan, and T.-C. Chiang Cadmium telluride (CdTe) is a direct band-gap semiconducting material with broad applications in optoelectronic devices. Here we report on a high-resolution angle-resolved photoemission (ARPES) study of CdTe ( 111 ) surfaces prepared by sputtering and annealing that show a ( 2 × 2 ) reconstruction as obser... [Phys. Rev. B 91, 235303] Published Mon Jun 01, 2015

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Interpolating function of the strain relief of epitaxial quantum dots via an alternative morphological descriptor (2015)

Daniele Scopece

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-05-27

Description: Author(s): Daniele Scopece Assessing the equilibrium morphologies of self-assembled heteroepitaxial quantum dots requires the estimation of their elastic (volumetric), surface, and edge energy contribution, all of them being shape dependent. Due to the size and multifaceted morphology of these islands, the estimation of the f... [Phys. Rev. B 91, 195318] Published Tue May 26, 2015

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Multiexciton dynamics in tailored band-gap quasi-one-dimensional systems (2015)

J. Szeszko, V. V. Belykh, A. Rudra, B. Dwir, N. N. Sibeldin, and E. Kapon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-12

Description: Author(s): J. Szeszko, V. V. Belykh, A. Rudra, B. Dwir, N. N. Sibeldin, and E. Kapon Optoelectronic properties of site-controlled AlGaAs/GaAs quasi-one-dimensional structures are investigated. Controllable linear variation of the band gap along the vertical axis of the quantum wire, symmetrical with respect to its center, results in a set of closely separated (by a few meV) confined... [Phys. Rev. B 91, 245304] Published Thu Jun 11, 2015

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Local aspects of hydrogen-induced metallization of the ZnO(101[over ¯]0) surface (2015)

J.-C. Deinert, O. T. Hofmann, M. Meyer, P. Rinke, and J. Stähler

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-13

Description: Author(s): J.-C. Deinert, O. T. Hofmann, M. Meyer, P. Rinke, and J. Stähler This study combines surface-sensitive photoemission experiments with density functional theory to give a microscopic description of H-adsorption-induced modifications of the ZnO ( 10 1 ¯ 0 ) surface electronic structure. We find a complex adsorption behavior caused by a strong coverage dependence of the H... [Phys. Rev. B 91, 235313] Published Fri Jun 12, 2015

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Hydrogen adsorbed at N-polar InN: Significant changes in the surface electronic properties (2015)

A. Eisenhardt, S. Krischok, and M. Himmerlich

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-13

Description: Author(s): A. Eisenhardt, S. Krischok, and M. Himmerlich The interaction of atomic hydrogen and ammonia with as-grown N-polar InN surfaces is investigated using in situ photoelectron spectroscopy. Changes in the surface electronic properties, including the band alignment and work function, as well as the chemical bonding states of the substrate and adsorb... [Phys. Rev. B 91, 245305] Published Fri Jun 12, 2015

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Voltage bistability of coherent electron injection and nonlinear dynamics of a Bloch oscillation in a semiconductor superlattice (2015)

C. Minot, V. S. Jagtap, E. Galopin, J. C. Harmand, S. Barbay, and J. Mangeney

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-13

Description: Author(s): C. Minot, V. S. Jagtap, E. Galopin, J. C. Harmand, S. Barbay, and J. Mangeney Voltage bistability is demonstrated at low temperature in a biased unipolar GaAs/AlGaAs superlattice, using a design based on tunneling from a charge reservoir into a Wannier-Stark ladder and competition between nearest and next-nearest neighbor coherent injection channels. The static conduction cha... [Phys. Rev. B 91, 245308] Published Fri Jun 12, 2015

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First-principles simulations of a graphene-based field-effect transistor (2015)

Yun-Peng Wang and Hai-Ping Cheng

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-13

Description: Author(s): Yun-Peng Wang and Hai-Ping Cheng We improvise an approach to carry out first-principles simulations of graphene-based vertical field-effect tunneling transistors that consist of a graphene | h − BN | graphene multilayer structure. Within the density functional theory framework, we exploit the effective screening medium (ESM) method to pr... [Phys. Rev. B 91, 245307] Published Fri Jun 12, 2015

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Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve (2015)

Stefano Chesi and W. A. Coish

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-06-13

Description: Author(s): Stefano Chesi and W. A. Coish We have theoretically analyzed coherent nuclear-spin dynamics induced by electron transport through a quantum-dot spin valve. The hyperfine interaction between electron and nuclear spins in a quantum dot allows for the transfer of angular momentum from spin-polarized electrons injected from ferromag... [Phys. Rev. B 91, 245306] Published Fri Jun 12, 2015

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Optical absorption by Dirac excitons in single-layer transition-metal dichalcogenides (2016)

Maxim Trushin, Mark Oliver Goerbig, and Wolfgang Belzig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-09

Description: Author(s): Maxim Trushin, Mark Oliver Goerbig, and Wolfgang Belzig We develop an analytically solvable model able to qualitatively explain nonhydrogenic exciton spectra observed recently in two-dimensional (2D) semiconducting transition-metal dichalcogenides. Our exciton Hamiltonian explicitly includes additional angular momentum associated with the pseudospin degr… [Phys. Rev. B 94, 041301(R)] Published Thu Jul 07, 2016

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Transferable tight-binding model for strained group IV and III-V materials and heterostructures (2016)

Yaohua Tan, Michael Povolotskyi, Tillmann Kubis, Timothy B. Boykin, and Gerhard Klimeck

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-22

Description: Author(s): Yaohua Tan, Michael Povolotskyi, Tillmann Kubis, Timothy B. Boykin, and Gerhard Klimeck It is critical to capture the effect due to strain and material interface for device level transistor modeling. We introduce a transferable s p 3 d 5 s * tight-binding model with nearest-neighbor interactions for arbitrarily strained group IV and III-V materials. The tight-binding model is parametrized wi… [Phys. Rev. B 94, 045311] Published Thu Jul 21, 2016

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Rayleigh waves, surface disorder, and phonon localization in nanostructures (2016)

L. N. Maurer, S. Mei, and I. Knezevic

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-22

Description: Author(s): L. N. Maurer, S. Mei, and I. Knezevic We introduce a technique to calculate thermal conductivity in disordered nanostructures: a finite-difference time-domain solution of the elastic-wave equation combined with the Green-Kubo formula. The technique captures phonon wave behavior and scales well to nanostructures that are too large or too… [Phys. Rev. B 94, 045312] Published Thu Jul 21, 2016

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Magnetocapacitance oscillations and thermoelectric effect in a two-dimensional electron gas irradiated by microwaves (2016)

A. D. Levin, G. M. Gusev, O. E. Raichev, Z. S. Momtaz, and A. K. Bakarov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-22

Description: Author(s): A. D. Levin, G. M. Gusev, O. E. Raichev, Z. S. Momtaz, and A. K. Bakarov To study the influence of microwave irradiation on two-dimensional electrons, we apply a method based on capacitance measurements in GaAs quantum well samples where the gate covers a central part of the layer. We find that the capacitance oscillations at high magnetic fields, caused by the oscillati… [Phys. Rev. B 94, 045313] Published Thu Jul 21, 2016

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Polarization and valley switching in monolayer group-IV monochalcogenides (2016)

Paul Z. Hanakata, Alexandra Carvalho, David K. Campbell, and Harold S. Park

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-26

Description: Author(s): Paul Z. Hanakata, Alexandra Carvalho, David K. Campbell, and Harold S. Park Group-IV monochalcogenides are a family of two-dimensional puckered materials with an orthorhombic structure that is comprised of polar layers. In this article, we use first principles calculations to show the multistability of monolayer SnS and GeSe, two prototype materials where the direction of t… [Phys. Rev. B 94, 035304] Published Mon Jul 25, 2016

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Linear polarization study of microwave-radiation-induced magnetoresistance oscillations: Comparison of power dependence to theory (2016)

Tianyu Ye, Jesús Iñarrea, W. Wegscheider, and R. G. Mani

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-26

Description: Author(s): Tianyu Ye, Jesús Iñarrea, W. Wegscheider, and R. G. Mani We present an experimental study of the microwave power and the linear polarization angle dependence of the microwave-induced magnetoresistance oscillations in the high-mobility GaAs/AlGaAs two-dimensional electron system. Experimental results show the sinusoidal dependence of the oscillatory magnet… [Phys. Rev. B 94, 035305] Published Mon Jul 25, 2016

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Interference features in scanning gate conductance maps of quantum point contacts with disorder (2016)

K. Kolasiński, B. Szafran, B. Brun, and H. Sellier

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-08-04

Description: Author(s): K. Kolasiński, B. Szafran, B. Brun, and H. Sellier We consider quantum point contact (QPC) defined within a disordered two-dimensional electron gas as studied by scanning gate microscopy. We evaluate the conductance maps in the Landauer approach with a wave-function picture of electron transport for samples with both low and high electron mobility a… [Phys. Rev. B 94, 075301] Published Wed Aug 03, 2016

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Bosonic lasing and trapping of a dressed photon fluid in InGaN at room temperature (2016)

Munise Cobet

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-08-05

Description: Author(s): Munise Cobet The generation of a quantum fluid of dressed photons at room temperature is experimentally demonstrated in an InGaN microcavity which is divided into two- and one-dimensional sections, resulting in single- and switchable multilevel coherent light emission. Ultra-low-threshold operation is attributed… [Phys. Rev. B 94, 075302] Published Thu Aug 04, 2016

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Theory of Hall effect in two-dimensional giant Rashba systems (2016)

Hidekatsu Suzuura and Tsuneya Ando

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-13

Description: Author(s): Hidekatsu Suzuura and Tsuneya Ando The weak-field Hall conductivity of disordered two-dimensional systems with strong Rashba spin-orbit interaction is studied in a self-consistent Born approximation. Explicit numerical results are obtained for scatterers with a Gaussian potential and for charged impurities. The singular behavior asso… [Phys. Rev. B 94, 035302] Published Tue Jul 12, 2016

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Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases (2016)

F. G. G. Hernandez, S. Ullah, G. J. Ferreira, N. M. Kawahala, G. M. Gusev, and A. K. Bakarov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-15

Description: Author(s): F. G. G. Hernandez, S. Ullah, G. J. Ferreira, N. M. Kawahala, G. M. Gusev, and A. K. Bakarov We imaged the transport of current-induced spin coherence in a two-dimensional electron gas confined in a triple quantum well. Nonlocal Kerr rotation measurements, based on the optical resonant amplification of the electrically-induced polarization, revealed a large spatial variation of the electron… [Phys. Rev. B 94, 045305] Published Thu Jul 14, 2016

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Unconventional spin texture in a noncentrosymmetric quantum spin Hall insulator (2016)

C. Mera Acosta, O. Babilonia, L. Abdalla, and A. Fazzio

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-16

Description: Author(s): C. Mera Acosta, O. Babilonia, L. Abdalla, and A. Fazzio We propose that the simultaneous presence of both Rashba and band inversion can lead to a Rashba-like spin splitting formed by two bands with the same in-plane helical spin texture. Because of this unconventional spin texture, the backscattering is forbidden in edge and bulk conductivity channels. W… [Phys. Rev. B 94, 041302(R)] Published Fri Jul 15, 2016

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Spin Hall and spin Nernst effects in a two-dimensional electron gas with Rashba spin-orbit interaction: Temperature dependence (2016)

A. Dyrdał, J. Barnaś, and V. K. Dugaev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-26

Description: Author(s): A. Dyrdał, J. Barnaś, and V. K. Dugaev Using the Matsubara Green's function formalism we calculate the temperature dependence of spin Hall and spin Nernst conductivities of a two-dimensional electron gas with Rashba spin-orbit interaction in the linear response regime. In the case of the spin Nernst effect we also include the contributio… [Phys. Rev. B 94, 035306] Published Mon Jul 25, 2016

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Transport of spin qubits with donor chains under realistic experimental conditions (2016)

Fahd A. Mohiyaddin, Rachpon Kalra, Arne Laucht, Rajib Rahman, Gerhard Klimeck, and Andrea Morello

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-26

Description: Author(s): Fahd A. Mohiyaddin, Rachpon Kalra, Arne Laucht, Rajib Rahman, Gerhard Klimeck, and Andrea Morello The ability to transport quantum information across some distance can facilitate the design and operation of a quantum processor. One-dimensional spin chains provide a compact platform to realize scalable spin transport for a solid-state quantum computer. Here, we model odd-sized donor chains in sil… [Phys. Rev. B 94, 045314] Published Mon Jul 25, 2016

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Half-skyrmion spin textures in polariton microcavities (2016)

P. Cilibrizzi, H. Sigurdsson, T. C. H. Liew, H. Ohadi, A. Askitopoulos, S. Brodbeck, C. Schneider, I. A. Shelykh, S. Höfling, J. Ruostekoski, and P. Lagoudakis

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-26

Description: Author(s): P. Cilibrizzi, H. Sigurdsson, T. C. H. Liew, H. Ohadi, A. Askitopoulos, S. Brodbeck, C. Schneider, I. A. Shelykh, S. Höfling, J. Ruostekoski, and P. Lagoudakis We study the polarization dynamics of a spatially expanding polariton condensate under nonresonant linearly polarized optical excitation. The spatially and temporally resolved polariton emission reveals the formation of nontrivial spin textures in the form of a quadruplet polarization pattern both i… [Phys. Rev. B 94, 045315] Published Mon Jul 25, 2016

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Universal quantum computation with hybrid spin-Majorana qubits (2016)

Silas Hoffman, Constantin Schrade, Jelena Klinovaja, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-26

Description: Author(s): Silas Hoffman, Constantin Schrade, Jelena Klinovaja, and Daniel Loss We theoretically propose a set of universal quantum gates acting on a hybrid qubit formed by coupling a quantum-dot spin qubit and Majorana fermion qubit. First, we consider a quantum dot that is tunnel coupled to two topological superconductors. The effective spin-Majorana exchange facilitates a hy… [Phys. Rev. B 94, 045316] Published Mon Jul 25, 2016

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Electric control of inverted gap and hybridization gap in type-II InAs/GaSb quantum wells (2016)

Lun-Hui Hu, Chao-Xing Liu, Dong-Hui Xu, Fu-Chun Zhang, and Yi Zhou

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-28

Description: Author(s): Lun-Hui Hu, Chao-Xing Liu, Dong-Hui Xu, Fu-Chun Zhang, and Yi Zhou The quantum spin Hall effect has been predicted theoretically and observed experimentally in InAs/GaSb quantum wells as a result of inverted band structures, for which electron bands in InAs layers are below heavy-hole bands in GaSb layers in energy. The hybridization between electron bands and heav… [Phys. Rev. B 94, 045317] Published Wed Jul 27, 2016

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Microscopic dielectric permittivities of graphene nanoribbons and graphene (2016)

Jingtian Fang, William G. Vandenberghe, and Massimo V. Fischetti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-29

Description: Author(s): Jingtian Fang, William G. Vandenberghe, and Massimo V. Fischetti We derive a microscopic Poisson equation using the density-density response function. This equation is valid for any realistic potential perturbation and permits the study of dielectric response in nanostructures, especially in one-dimensional nanostructures and quantum dots. We apply this equation … [Phys. Rev. B 94, 045318] Published Thu Jul 28, 2016

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Analog of microwave-induced resistance oscillations induced in GaAs heterostructures by terahertz radiation (2016)

T. Herrmann, I. A. Dmitriev, D. A. Kozlov, M. Schneider, B. Jentzsch, Z. D. Kvon, P. Olbrich, V. V. Bel'kov, A. Bayer, D. Schuh, D. Bougeard, T. Kuczmik, M. Oltscher, D. Weiss, and S. D. Ganichev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-08-02

Description: Author(s): T. Herrmann, I. A. Dmitriev, D. A. Kozlov, M. Schneider, B. Jentzsch, Z. D. Kvon, P. Olbrich, V. V. Bel'kov, A. Bayer, D. Schuh, D. Bougeard, T. Kuczmik, M. Oltscher, D. Weiss, and S. D. Ganichev We report on the study of terahertz radiation-induced MIRO-like oscillations of magnetoresistivity in GaAs heterostructures. Our experiments provide an answer on two most intriguing questions—effect of radiation helicity and the role of the edges—yielding crucial information for an understanding of … [Phys. Rev. B 94, 081301(R)] Published Mon Aug 01, 2016

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Enhanced and polarized emission from single colloidal CdSe/CdS nanocrystals coupled to a one-dimensional gold grating (2016)

F. Eloi, H. Frederich, F. Mazéas, A. Kumar, S. Buil, X. Quélin, A. Bouhelier, J. C. Weeber, M. Nasilowski, B. Dubertret, G. Colas des Francs, and J.-P. Hermier

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-08-04

Description: Author(s): F. Eloi, H. Frederich, F. Mazéas, A. Kumar, S. Buil, X. Quélin, A. Bouhelier, J. C. Weeber, M. Nasilowski, B. Dubertret, G. Colas des Francs, and J.-P. Hermier We present in detail the fluorescence properties of single thick-shell CdSe/CdS colloidal nanocrystals coupled to a linear one-dimensional gold grating. In addition to the photoluminescence decay rate increase, we point out that the polarization ratio of the emission is dramatically enhanced. It ove… [Phys. Rev. B 94, 085301] Published Wed Aug 03, 2016

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Switching of charge-current-induced spin polarization in the topological insulator BiSbTeSe_{2} (2016)

Fan Yang, Subhamoy Ghatak, A. A. Taskin, Kouji Segawa, Yuichiro Ando, Masashi Shiraishi, Yasushi Kanai, Kazuhiko Matsumoto, Achim Rosch, and Yoichi Ando

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-08-06

Description: Author(s): Fan Yang, Subhamoy Ghatak, A. A. Taskin, Kouji Segawa, Yuichiro Ando, Masashi Shiraishi, Yasushi Kanai, Kazuhiko Matsumoto, Achim Rosch, and Yoichi Ando The charge-current-induced spin polarization is a key property of topological insulators for their applications in spintronics. However, topological surface states are expected to give rise to only one type of spin polarization for a given current direction, which has been a limiting factor for spin… [Phys. Rev. B 94, 075304] Published Fri Aug 05, 2016

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Dynamics of pit filling in heteroepitaxy via phase-field simulations (2016)

Marco Albani, Roberto Bergamaschini, and Francesco Montalenti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-08-06

Description: Author(s): Marco Albani, Roberto Bergamaschini, and Francesco Montalenti Heteroepitaxial growth on a pit-patterned substrate is investigated by phase-field simulations, tackling both film and substrate geometry and elastic properties. The dynamics results from material deposition and redistribution via surface diffusion according to the tendency toward free-energy minimi… [Phys. Rev. B 94, 075303] Published Fri Aug 05, 2016

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Triplet excitons as sensitive spin probes for structure analysis of extended defects in microcrystalline silicon (2016)

Christoph Meier, Christian Teutloff, Jan Behrends, Robert Bittl, Oleksandr Astakhov, and Klaus Lips

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-07

Description: Author(s): Christoph Meier, Christian Teutloff, Jan Behrends, Robert Bittl, Oleksandr Astakhov, and Klaus Lips Electrically detected magnetic resonance (EDMR) spectroscopy is employed to study the influence of triplet excitons on the photocurrent in state-of-the-art microcrystalline silicon thin-film solar cells. These triplet excitons are used as sensitive spin probes for the investigation of their electron… [Phys. Rev. B 94, 045302] Published Wed Jul 06, 2016

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Switchable magnetic moment in cobalt-doped graphene bilayer on Cu(111): An ab initio study (2016)

Everson S. Souza, Wanderlã L. Scopel, and R. H. Miwa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-21

Description: Author(s): Everson S. Souza, Wanderlã L. Scopel, and R. H. Miwa In this work, we have performed an ab initio theoretical investigation of substitutional cobalt atoms in the graphene bilayer supported on the Cu(111) surface (Co/GBL/Cu). Initially, we examined the separated systems, namely, graphene bilayer adsorbed on Cu(111) (GBL/Cu) and a free standing Co-doped… [Phys. Rev. B 93, 235308] Published Mon Jun 20, 2016

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Weak antilocalization in two-dimensional systems with large Rashba splitting (2016)

L. E. Golub, I. V. Gornyi, and V. Yu. Kachorovskii

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-21

Description: Author(s): L. E. Golub, I. V. Gornyi, and V. Yu. Kachorovskii We develop the theory of quantum transport and magnetoconductivity for two-dimensional electrons with an arbitrarily large (even exceeding the Fermi energy), linear-in-momentum Rashba or Dresselhaus spin-orbit splitting. For short-range disorder potentials, we derive the analytical expression for th… [Phys. Rev. B 93, 245306] Published Mon Jun 20, 2016

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All-optical dynamical Casimir effect in a three-dimensional terahertz photonic band gap (2016)

David Hagenmüller

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-21

Description: Author(s): David Hagenmüller We identify an architecture for the observation of all-optical dynamical Casimir effect in realistic experimental conditions. We suggest that by integrating quantum wells in a three-dimensional (3D) photonic band-gap material made out of large-scale ( ∼ 200 − μ m ) germanium logs, it is possible to achiev… [Phys. Rev. B 93, 235309] Published Mon Jun 20, 2016

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Surface roughness scattering in multisubband accumulation layers (2016)

Han Fu, K. V. Reich, and B. I. Shklovskii

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-25

Description: Author(s): Han Fu, K. V. Reich, and B. I. Shklovskii Accumulation layers with very large concentrations of electrons where many subbands are filled became recently available due to ionic liquid and other new methods of gating. The low-temperature mobility in such layers is limited by the surface roughness scattering. However, theories of roughness sca… [Phys. Rev. B 93, 235312] Published Thu Jun 23, 2016

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Vertically coupled dipolar exciton molecules (2016)

Kobi Cohen, Maxim Khodas, Boris Laikhtman, Paulo V. Santos, and Ronen Rapaport

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-25

Description: Author(s): Kobi Cohen, Maxim Khodas, Boris Laikhtman, Paulo V. Santos, and Ronen Rapaport While the interaction potential between two dipoles residing in a single plane is repulsive, in a system of two vertically adjacent layers of dipoles it changes from repulsive interaction in the long range to attractive interaction in the short range. Here we show that for dipolar excitons in semico… [Phys. Rev. B 93, 235310] Published Thu Jun 23, 2016

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Excited-state charging energies in quantum dots investigated by terahertz photocurrent spectroscopy (2016)

Y. Zhang, K. Shibata, N. Nagai, C. Ndebeka-Bandou, G. Bastard, and K. Hirakawa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-28

Description: Author(s): Y. Zhang, K. Shibata, N. Nagai, C. Ndebeka-Bandou, G. Bastard, and K. Hirakawa We have investigated the excited-state (ES) charging energies in quantum dots (QDs) by measuring a terahertz (THz)-induced photocurrent in a single-electron transistor (SET) geometry that contains a single InAs QD between metal nanogap electrodes. A photocurrent is produced in the QD SETs through TH… [Phys. Rev. B 93, 235313] Published Fri Jun 24, 2016

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First-principles investigation of two-dimensional trichalcogenide and sesquichalcogenide monolayers (2016)

L. Debbichi, H. Kim, T. Björkman, O. Eriksson, and S. Lebègue

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-28

Description: Author(s): L. Debbichi, H. Kim, T. Björkman, O. Eriksson, and S. Lebègue We have used density functional theory to investigate the dynamical stability and the electronic structure of several new semiconducting two-dimensional single layers, with chemical compositions such as AB X 3 and A 2 X 3 . The calculated interlayer binding energies and the absence of imaginary states in … [Phys. Rev. B 93, 245307] Published Fri Jun 24, 2016

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Tracking quintuple layer oxidation on cleaved Bi_{2} Se_{3} by optical second-harmonic anisotropy (2016)

Yong Q. An, Avery J. Green, and Alain C. Diebold

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-28

Description: Author(s): Yong Q. An, Avery J. Green, and Alain C. Diebold We find that the major and minor intensity lobes of a measured rotational-anisotropy pattern of optical second-harmonic generation (SHG) from a cleaved B i 2 S e 3 (111) surface can gradually change with time and eventually switch their relative amplitudes. This switching provides a means for tracking th… [Phys. Rev. B 93, 241308(R)] Published Fri Jun 24, 2016

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Rashba scattering in the low-energy limit (2016)

Joel Hutchinson and Joseph Maciejko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-29

Description: Author(s): Joel Hutchinson and Joseph Maciejko We study potential scattering in a two-dimensional electron gas with Rashba spin-orbit coupling in the limit that the energy of the scattering electron approaches the bottom of the lower spin-split band. Focusing on two spin-independent circularly symmetric potentials, an infinite barrier and a delt… [Phys. Rev. B 93, 245309] Published Mon Jun 27, 2016

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Spin noise of a polariton laser (2016)

I. I. Ryzhov, M. M. Glazov, A. V. Kavokin, G. G. Kozlov, M. Aßmann, P. Tsotsis, Z. Hatzopoulos, P. G. Savvidis, M. Bayer, and V. S. Zapasskii

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-24

Description: Author(s): I. I. Ryzhov, M. M. Glazov, A. V. Kavokin, G. G. Kozlov, M. Aßmann, P. Tsotsis, Z. Hatzopoulos, P. G. Savvidis, M. Bayer, and V. S. Zapasskii We report on experimental study of the exciton-polariton emission (PE) polarization noise below and above the polariton lasing threshold under continuous-wave nonresonant excitation. The experiments were performed with a high- Q graded 5 λ / 2 GaAs/AlGaAs microcavity with four sets of three quantum well… [Phys. Rev. B 93, 241307(R)] Published Wed Jun 22, 2016

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Self-consistent calculation of dephasing in quantum cascade structures within a density matrix method (2016)

Will Freeman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-04

Description: Author(s): Will Freeman Dephasing in terahertz quantum cascade structures is studied within a density matrix formalism. We self-consistently calculate the pure dephasing time from the intrasubband interactions within the upper and lower lasing states. Interface roughness and ionized impurity scattering interactions are inc… [Phys. Rev. B 93, 205301] Published Tue May 03, 2016

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STM and DFT study on formation and characterization of Ba-incorporated phases on a Ge(001) surface (2016)

W. Koczorowski, A. Puchalska, T. Grzela, L. Jurczyszyn, S. R. Schofield, R. Czajka, N. J. Curson, and M. W. Radny

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-10

Description: Author(s): W. Koczorowski, A. Puchalska, T. Grzela, L. Jurczyszyn, S. R. Schofield, R. Czajka, N. J. Curson, and M. W. Radny We characterize the incorporation of Ba adatoms into the Ge(001) surface, resulting in the formation of one-dimensional structures with an internal 2 × 3 periodicity, after the deposition of Ba atoms at 970 K or at room temperature followed by a 770 K anneal. Scanning tunneling microscopy (STM) data w… [Phys. Rev. B 93, 195304] Published Mon May 09, 2016

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Pressure-induced topological insulator in NaBaBi with right-handed surface spin texture (2016)

Yan Sun, Qing-Ze Wang, Shu-Chun Wu, Claudia Felser, Chao-Xing Liu, and Binghai Yan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-10

Description: Author(s): Yan Sun, Qing-Ze Wang, Shu-Chun Wu, Claudia Felser, Chao-Xing Liu, and Binghai Yan Starting from the three-dimensional Dirac semimetal in Na 3 Bi , we found a topological insulator (TI) in the known compound of NaBaBi by extra pressure. The TI of NaBaBi can be viewed as the distorted version of Na 3 Bi with breaking inversion symmetry. When the exchange-correlation energy is considered… [Phys. Rev. B 93, 205303] Published Mon May 09, 2016

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Hedgehog spin texture and competing orders associated with strains on the surface of a topological crystalline insulator (2016)

Cheng-Yi Huang, Hsin Lin, Yung Jui Wang, Arun Bansil, and Wei-Feng Tsai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-10

Description: Author(s): Cheng-Yi Huang, Hsin Lin, Yung Jui Wang, Arun Bansil, and Wei-Feng Tsai We have investigated spin reorientation phenomena and interaction-driven effects under the presence of applied strains on the (001) surface of Pb 1 − x Sn x (Te, Se) topological crystalline insulators, which host multiple Dirac cones. Our analysis is based on a four-band k · p model, which captures the spin… [Phys. Rev. B 93, 205304] Published Mon May 09, 2016

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Keldysh field theory for nonequilibrium condensation in a parametrically pumped polariton system (2016)

K. Dunnett and M. H. Szymańska

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-11

Description: Author(s): K. Dunnett and M. H. Szymańska We develop a quantum field theory for parametrically pumped polaritons using Keldysh Green's function techniques with which the occupations of the excitation spectra can be calculated. By considering the mean field and Gaussian fluctuations, we find that the highly nonequilibrium phase transition to… [Phys. Rev. B 93, 195306] Published Tue May 10, 2016

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Surface phase, morphology, and charge distribution transitions on vacuum and ambient annealed SrTiO_{3} (100) (2016)

Omur E. Dagdeviren, Georg H. Simon, Ke Zou, Fred J. Walker, Charles Ahn, Eric I. Altman, and Udo D. Schwarz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-05

Description: Author(s): Omur E. Dagdeviren, Georg H. Simon, Ke Zou, Fred J. Walker, Charles Ahn, Eric I. Altman, and Udo D. Schwarz The surface structures of SrTi O 3 (100) single crystals were examined as a function of annealing time and temperature in either oxygen atmosphere or ultrahigh vacuum (UHV) using noncontact atomic force microscopy (NC-AFM), Auger electron spectroscopy (AES), and low-energy electron diffraction (LEED).… [Phys. Rev. B 93, 195303] Published Wed May 04, 2016

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Topological lasing in resonant photonic structures (2016)

Laura Pilozzi and Claudio Conti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-28

Description: Author(s): Laura Pilozzi and Claudio Conti We exploit topological edge states in resonant photonic crystals to attain strongly localized resonances and demonstrate lasing in these modes upon optical excitation. The use of virtually lossless topologically isolated edge states may lead to a class of thresholdless lasers operating without inver… [Phys. Rev. B 93, 195317] Published Fri May 27, 2016

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Coherence and degree of time-bin entanglement from quantum dots (2016)

Tobias Huber, Laurin Ostermann, Maximilian Prilmüller, Glenn S. Solomon, Helmut Ritsch, Gregor Weihs, and Ana Predojević

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-13

Description: Author(s): Tobias Huber, Laurin Ostermann, Maximilian Prilmüller, Glenn S. Solomon, Helmut Ritsch, Gregor Weihs, and Ana Predojević We report a study on coherence of excitation of single quantum dots. We address the coherent excitation of biexcitons, the process that is indispensable for deterministic photon pair generation in quantum dots. Based on theoretical modeling we optimized the duration of the excitation pulse in our ex… [Phys. Rev. B 93, 201301(R)] Published Thu May 12, 2016

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Gapped triplet p-wave superconductivity in strong spin-orbit-coupled semiconductor quantum wells in proximity to s-wave superconductor (2016)

T. Yu and M. W. Wu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-12

Description: Author(s): T. Yu and M. W. Wu We show that gapped triplet superconductivity, i.e., a triplet superconductor with a triplet order parameter, can be realized in strong spin-orbit-coupled (100) quantum wells in proximity to an s -wave superconductor. It is revealed that in quantum wells with the singlet order parameter induced from … [Phys. Rev. B 93, 195308] Published Wed May 11, 2016

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Exact two-body quantum dynamics of an electron-hole pair in semiconductor coupled quantum wells: A time-dependent approach (2016)

Federico Grasselli, Andrea Bertoni, and Guido Goldoni

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-13

Description: Author(s): Federico Grasselli, Andrea Bertoni, and Guido Goldoni We simulate the time-dependent coherent dynamics of a spatially indirect exciton—an electron-hole pair with the two particles confined in different layers—in a GaAs coupled quantum well system. We use a unitary wave-packet propagation method taking into account in full the four degrees of freedom of… [Phys. Rev. B 93, 195310] Published Thu May 12, 2016

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Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO_{3} /SrTiO_{3} interface (2016)

I. Pallecchi, F. Telesio, D. Marré, D. Li, S. Gariglio, J.-M. Triscone, and A. Filippetti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-13

Description: Author(s): I. Pallecchi, F. Telesio, D. Marré, D. Li, S. Gariglio, J.-M. Triscone, and A. Filippetti The thermoelectric power of the two-dimensional electron system (2DES) at the LaAlO 3 / SrTiO 3 interface is explored below room temperature, in comparison with that of Nb-doped SrTiO 3 single crystals. For the interface, we find a region below T = 50 K where thermopower is dominated by phonon drag, whose … [Phys. Rev. B 93, 195309] Published Thu May 12, 2016

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Single-edge transport in an InAs/GaSb quantum spin Hall insulator (2016)

François Couëdo, Hiroshi Irie, Kyoichi Suzuki, Koji Onomitsu, and Koji Muraki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-09

Description: Author(s): François Couëdo, Hiroshi Irie, Kyoichi Suzuki, Koji Onomitsu, and Koji Muraki We report transport measurements in a single edge channel of an InAs/GaSb quantum spin Hall insulator, where the conduction occurs through only one pair of counterpropagating edge modes. By using a specific sample design involving highly asymmetric current paths, we electrically isolate a single edg… [Phys. Rev. B 94, 035301] Published Fri Jul 08, 2016

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Gating versus doping: Quality parameters of two-dimensional electron systems in undoped and doped GaAs/AlGaAs heterostructures (2016)

S. Peters, L. Tiemann, C. Reichl, and W. Wegscheider

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-09

Description: Author(s): S. Peters, L. Tiemann, C. Reichl, and W. Wegscheider We present an experimental study of the scattering mechanisms in a two-dimensional electron system which is either fully induced by the field effect or resulting from remote doping. The quality criteria—the electron mobility, the quantum scattering time, and the number and development of certain fra… [Phys. Rev. B 94, 045304] Published Fri Jul 08, 2016

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Neutral and charged biexciton-exciton cascade in near-telecom-wavelength quantum dots (2016)

Jan Kettler, Matthias Paul, Fabian Olbrich, Katharina Zeuner, Michael Jetter, Peter Michler, Matthias Florian, Christian Carmesin, and Frank Jahnke

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-09

Description: Author(s): Jan Kettler, Matthias Paul, Fabian Olbrich, Katharina Zeuner, Michael Jetter, Peter Michler, Matthias Florian, Christian Carmesin, and Frank Jahnke We investigate the cascaded emission of photons from low-density InGaAs/GaAs quantum dots grown by metal-organic vapor-phase epitaxy that are intentionally redshifted toward telecommunication wavelengths. We observe multiple radiative cascades within a single quantum dot and attribute these to neutr… [Phys. Rev. B 94, 045303] Published Fri Jul 08, 2016

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Enhanced spin-polarization lifetimes in a two-dimensional electron gas in a gate-controlled GaAs quantum well (2016)

Sergiu Anghel, Akshay Singh, Felix Passmann, Hikaru Iwata, John N. Moore, Go Yusa, Xiaoqin Li, and Markus Betz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-19

Description: Author(s): Sergiu Anghel, Akshay Singh, Felix Passmann, Hikaru Iwata, John N. Moore, Go Yusa, Xiaoqin Li, and Markus Betz Exciton, trion, and electron spin dynamics in a 20-nm-wide modulation-doped GaAs single quantum well are investigated using resonant ultrafast two-color Kerr rotation spectroscopy. Excitons and trions are selectively detected by resonant probe pulses while their relative spectral weight is controlle… [Phys. Rev. B 94, 035303] Published Mon Jul 18, 2016

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Fast and selective phonon-assisted state preparation of a quantum dot by adiabatic undressing (2016)

A. M. Barth, S. Lüker, A. Vagov, D. E. Reiter, T. Kuhn, and V. M. Axt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-19

Description: Author(s): A. M. Barth, S. Lüker, A. Vagov, D. E. Reiter, T. Kuhn, and V. M. Axt We investigate theoretically the temporal behavior of a quantum dot under off-resonant optical excitation targeted at fast acoustic phonon-assisted state preparation. We demonstrate that in a preparation process driven by short laser pulses, three processes can be identified: a dressing of the state… [Phys. Rev. B 94, 045306] Published Mon Jul 18, 2016

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Electronic structure of hydrogenated diamond: Microscopical insight into surface conductivity (2016)

S. Iacobucci, Paola Alippi, P. Calvani, M. Girolami, F. Offi, L. Petaccia, and D. M. Trucchi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-19

Description: Author(s): S. Iacobucci, Paola Alippi, P. Calvani, M. Girolami, F. Offi, L. Petaccia, and D. M. Trucchi We have correlated the surface conductivity of hydrogen-terminated diamond to the electronic structure in the Fermi region. Significant density of electronic states (DOS) in proximity of the Fermi edge has been measured by photoelectron spectroscopy (PES) on surfaces exposed to air, corresponding to… [Phys. Rev. B 94, 045307] Published Mon Jul 18, 2016

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Polarization dependence of nonlinear wave mixing of spinor polaritons in semiconductor microcavities (2016)

Przemyslaw Lewandowski, Ombline Lafont, Emmanuel Baudin, Chris K. P. Chan, P. T. Leung, Samuel M. H. Luk, Elisabeth Galopin, Aristide Lemaître, Jacqueline Bloch, Jerome Tignon, Philippe Roussignol, N. H. Kwong, Rolf Binder, and Stefan Schumacher

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-19

Description: Author(s): Przemyslaw Lewandowski, Ombline Lafont, Emmanuel Baudin, Chris K. P. Chan, P. T. Leung, Samuel M. H. Luk, Elisabeth Galopin, Aristide Lemaître, Jacqueline Bloch, Jerome Tignon, Philippe Roussignol, N. H. Kwong, Rolf Binder, and Stefan Schumacher The pseudospin dynamics of propagating exciton-polaritons in semiconductor microcavities are known to be strongly influenced by TE-TM splitting. As a vivid consequence, in the Rayleigh scattering regime, the TE-TM splitting gives rise to the optical spin Hall effect (OSHE). Much less is known about … [Phys. Rev. B 94, 045308] Published Mon Jul 18, 2016

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Anomalous conductivity, Hall factor, magnetoresistance, and thermopower of accumulation layer in SrTiO_{3} (2016)

Han Fu, K. V. Reich, and B. I. Shklovskii

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-20

Description: Author(s): Han Fu, K. V. Reich, and B. I. Shklovskii We study the low temperature conductivity of the electron accumulation layer induced by the very strong electric field at the surface of an SrTiO 3 sample. Due to the strongly nonlinear lattice dielectric response, the three-dimensional density of electrons n ( x ) in such a layer decays with the distan… [Phys. Rev. B 94, 045310] Published Tue Jul 19, 2016

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Limitation of electron mobility from hyperfine interaction in ultraclean quantum wells and topological insulators (2016)

S. A. Tarasenko and Guido Burkard

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-20

Description: Author(s): S. A. Tarasenko and Guido Burkard The study of electron transport and scattering processes limiting electron mobility in high-quality semiconductor structures is central to solid-state electronics. Here, we uncover an unavoidable source of electron scattering which is caused by fluctuations of nuclear spins. We calculate the momentu… [Phys. Rev. B 94, 045309] Published Tue Jul 19, 2016

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Interband characterization and electronic transport control of nanoscaled GeTe/Sb_{2} Te_{3} superlattices (2016)

Antonio Caretta, Barbara Casarin, Paola Di Pietro, Andrea Perucchi, Stefano Lupi, Valeria Bragaglia, Raffaella Calarco, Felix Rolf Lutz Lange, Matthias Wuttig, Fulvio Parmigiani, and Marco Malvestuto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-29

Description: Author(s): Antonio Caretta, Barbara Casarin, Paola Di Pietro, Andrea Perucchi, Stefano Lupi, Valeria Bragaglia, Raffaella Calarco, Felix Rolf Lutz Lange, Matthias Wuttig, Fulvio Parmigiani, and Marco Malvestuto The extraordinary electronic and optical properties of the crystal-to-amorphous transition in phase-change materials have led to important developments in memory applications. A promising outlook is offered by nanoscaling such phase-change structures. Following this research line, we study the inter… [Phys. Rev. B 94, 045319] Published Thu Jul 28, 2016

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Spin noise of localized electrons: Interplay of hopping and hyperfine interaction (2015)

M. M. Glazov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-05-06

Description: Author(s): M. M. Glazov The theory of spin fluctuations is developed for an ensemble of localized electrons, taking into account both the hyperfine interaction of electron and nuclear spins and electron hopping between the sites. The analytical expression for the spin noise spectrum is derived for an arbitrary relation bet... [Phys. Rev. B 91, 195301] Published Tue May 05, 2015

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