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1

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Optical properties of charged quantum dots doped with a single magnetic impurity (2013)

U. C. Mendes, M. Korkusinski, A. H. Trojnar, and P. Hawrylak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): U. C. Mendes, M. Korkusinski, A. H. Trojnar, and P. Hawrylak We present a microscopic theory of the optical properties of self-assembled quantum dots doped with a single magnetic manganese (Mn) impurity and containing a controlled number of electrons. The single-particle electron and heavy-hole electronic shells are described by two-dimensional harmonic oscil... [Phys. Rev. B 88, 115306] Published Fri Sep 13, 2013

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Large band offset as driving force of two-dimensional electron confinement: The case of SrTiO_{3}/SrZrO_{3} interface (2013)

P. Delugas, A. Filippetti, A. Gadaleta, I. Pallecchi, D. Marré, and V. Fiorentini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): P. Delugas, A. Filippetti, A. Gadaleta, I. Pallecchi, D. Marré, and V. Fiorentini Using advanced first-principles calculations we predict that the nonpolar SrTiO 3 /SrZrO 3 (001) interface, designed as either thin SrZrO 3 film deposited on SrTiO 3 or short-period (SrTiO 3 ) m /(SrZrO 3 ) n superlattice, hosts a two-dimensionally confined electron gas. Mobile electron charge due to native imp... [Phys. Rev. B 88, 115304] Published Fri Sep 13, 2013

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Group-velocity slowdown in a double quantum dot molecule (2013)

Stephan Michael, Weng W. Chow, and Hans Christian Schneider

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): Stephan Michael, Weng W. Chow, and Hans Christian Schneider The slowdown of optical pulses due to quantum-coherence effects is investigated theoretically for an “active material” consisting of InGaAs-based double quantum dot molecules. These are designed to exhibit a long-lived coherence between two electronic levels, which is an essential part of a quantum-... [Phys. Rev. B 88, 125305] Published Fri Sep 13, 2013

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Unrolling the evolution kinetics of ordered SiGe islands via Ge surface diffusion (2013)

M. Grydlik, M. Brehm, F. Hackl, F. Schäffler, G. Bauer, and T. Fromherz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): M. Grydlik, M. Brehm, F. Hackl, F. Schäffler, G. Bauer, and T. Fromherz During molecular beam epitaxial growth of Ge islands on Si(001) substrates containing pit-patterned areas, an efficient Ge surface diffusion from unpatterned to pit-patterned substrate regions results in position-dependent island growth rates. We exploit this effect to map out the evolution of stric... [Phys. Rev. B 88, 115311] Published Fri Sep 20, 2013

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Suppression of Coulomb exchange energy in quasi-two-dimensional hole systems (2013)

T. Kernreiter, M. Governale, R. Winkler, and U. Zülicke

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): T. Kernreiter, M. Governale, R. Winkler, and U. Zülicke We have calculated the exchange-energy contribution to the total energy of quasi-two-dimensional hole systems realized by a hard-wall quantum-well confinement of valence-band states in typical semiconductors. The magnitude of the exchange energy turns out to be suppressed from the value expected for... [Phys. Rev. B 88, 125309] Published Fri Sep 20, 2013

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Measurement and effects of polarization fields on one-monolayer-thick InN/GaN multiple quantum wells (2013)

Lin Zhou, E. Dimakis, R. Hathwar, Toshihiro Aoki, David J. Smith, T. D. Moustakas, S. M. Goodnick, and Martha R. McCartney

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Lin Zhou, E. Dimakis, R. Hathwar, Toshihiro Aoki, David J. Smith, T. D. Moustakas, S. M. Goodnick, and Martha R. McCartney Polarization fields associated with one-monolayer-thick InN/GaN multiple quantum wells (MQWs) cause shifts of the photoluminescence peak that depend on the GaN barrier layer thickness. Diffraction contrast and aberration-corrected scanning transmission electron microscopy show that the InN QWs are w... [Phys. Rev. B 88, 125310] Published Wed Sep 25, 2013

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Imaging the polariton relaxation bottleneck in strongly coupled organic semiconductor microcavities (2013)

David M. Coles, Richard T. Grant, David G. Lidzey, Caspar Clark, and Pavlos G. Lagoudakis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): David M. Coles, Richard T. Grant, David G. Lidzey, Caspar Clark, and Pavlos G. Lagoudakis We use angular-resolved photoluminescence excitation spectroscopy to probe energy relaxation towards the lowest lying states ( k ∥ =0) on the lower polariton branch (LPB) of two different strong-coupled J -aggregate organic semiconductor microcavities. We find that states along the upper polariton branc... [Phys. Rev. B 88, 121303] Published Mon Sep 30, 2013

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Nonlinear piezoelectricity in wurtzite semiconductors (2013)

Pierre-Yves Prodhomme, Annie Beya-Wakata, and Gabriel Bester

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Pierre-Yves Prodhomme, Annie Beya-Wakata, and Gabriel Bester We present first-principles calculations of piezoelectric coefficients of first and second order for AlN, GaN, InN, and ZnO, along with the composition dependence (bowing) of the linear terms. We show that eight second order coefficients are required and provide a simple description on how to incorp... [Phys. Rev. B 88, 121304] Published Mon Sep 30, 2013

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Charge carrier mobility in a two-phase disordered organic system in the low-carrier concentration regime (2013)

Cristiano F. Woellner, Zi Li, José A. Freire, Gang Lu, and Thuc-Quyen Nguyen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Cristiano F. Woellner, Zi Li, José A. Freire, Gang Lu, and Thuc-Quyen Nguyen In this paper we use a three-dimensional Pauli master equation to investigate the charge carrier mobility of a two-phase system which can mimic donor-acceptor and amorphous-crystalline bulk heterojunctions. By taking the energetic disorder of each phase, their energy offset, and domain morphology in... [Phys. Rev. B 88, 125311] Published Mon Sep 30, 2013

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Single-electron double quantum dot dipole-coupled to a single photonic mode (2013)

J. Basset, D.-D. Jarausch, A. Stockklauser, T. Frey, C. Reichl, W. Wegscheider, T. M. Ihn, K. Ensslin, and A. Wallraff

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): J. Basset, D.-D. Jarausch, A. Stockklauser, T. Frey, C. Reichl, W. Wegscheider, T. M. Ihn, K. Ensslin, and A. Wallraff We have realized a hybrid solid-state quantum device in which a single-electron semiconductor double quantum dot is dipole coupled to a superconducting microwave frequency transmission line resonator. The dipolar interaction between the two entities manifests itself via dispersive and dissipative ef... [Phys. Rev. B 88, 125312] Published Mon Sep 30, 2013

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Nontrivial topological electronic structures in a single Bi(111) bilayer on different substrates: A first-principles study (2013)

Zhi-Quan Huang, Feng-Chuan Chuang, Chia-Hsiu Hsu, Yu-Tzu Liu, Hua-Rong Chang, Hsin Lin, and Arun Bansil

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): Zhi-Quan Huang, Feng-Chuan Chuang, Chia-Hsiu Hsu, Yu-Tzu Liu, Hua-Rong Chang, Hsin Lin, and Arun Bansil Electronic structures, minimum energy configurations, and band topology of strained Bi(111) single bilayers placed on a variety of semiconducting and insulating substrates are investigated using first-principles calculations. A topological phase diagram of a free-standing Bi bilayer is presented to ... [Phys. Rev. B 88, 165301] Published Tue Oct 01, 2013

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Simulations of electric-dipole spin resonance for spin-orbit coupled quantum dots in the Overhauser field: Fractional resonances and selection rules (2013)

E. N. Osika, B. Szafran, and M. P. Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): E. N. Osika, B. Szafran, and M. P. Nowak We consider spin rotations in single- and two-electron quantum dots that are driven by an external ac electric field with two mechanisms that couple the electron spatial motion and the spin degree of freedom: the spin-orbit interaction and a random fluctuation of the Overhauser field due to nuclear ... [Phys. Rev. B 88, 165302] Published Wed Oct 02, 2013

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Phonon influence on the measurement of spin states in double quantum dots using the quantum point contact (2013)

Łukasz Marcinowski, Katarzyna Roszak, Paweł Machnikowski, and Mateusz Krzyżosiak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): Łukasz Marcinowski, Katarzyna Roszak, Paweł Machnikowski, and Mateusz Krzyżosiak We study the influence of phonon scattering on the noise characteristics of a quantum point contact coupled to a two-electron system in a double quantum dot, as proposed for a singlet-triplet measurement scheme in a double-dot system. We point out that at low temperatures phonon-induced relaxation t... [Phys. Rev. B 88, 125303] Published Fri Sep 06, 2013

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GaN(0001) surface states: Experimental and theoretical fingerprints to identify surface reconstructions (2013)

M. Himmerlich, L. Lymperakis, R. Gutt, P. Lorenz, J. Neugebauer, and S. Krischok

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-12

Beschreibung: Author(s): M. Himmerlich, L. Lymperakis, R. Gutt, P. Lorenz, J. Neugebauer, and S. Krischok The surface electronic structure of GaN(0001) surfaces is characterized by photoelectron spectroscopy. Depending on the surface preparation conditions, such as cooldown in nitrogen plasma after growth and additional vacuum annealing or Ga deposition, different surface states are observed at the vale... [Phys. Rev. B 88, 125304] Published Wed Sep 11, 2013

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Z_{2} anomaly and boundaries of topological insulators (2013)

Zohar Ringel and Ady Stern

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Zohar Ringel and Ady Stern We study the edge and surface theories of topological insulators from the perspective of anomalies and identify a Z 2 anomaly associated with charge conservation. The anomaly is manifested through a two-point correlation function involving creation and annihilation operators on two decoupled boundari... [Phys. Rev. B 88, 115307] Published Tue Sep 17, 2013

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Pattern formation in the exciton inner ring (2013)

M. Remeika, A. T. Hammack, S. V. Poltavtsev, L. V. Butov, J. Wilkes, A. L. Ivanov, K. L. Campman, M. Hanson, and A. C. Gossard

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): M. Remeika, A. T. Hammack, S. V. Poltavtsev, L. V. Butov, J. Wilkes, A. L. Ivanov, K. L. Campman, M. Hanson, and A. C. Gossard We report on the two-beam study of indirect excitons in the inner ring in the exciton emission pattern. One laser beam generates the inner ring and a second weaker beam is positioned in the inner ring. The beam positioned in the inner ring is found to locally suppress the exciton emission intensity.... [Phys. Rev. B 88, 125307] Published Tue Sep 17, 2013

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Finite-element methods for spatially resolved mesoscopic electron transport (2013)

Stephan Kramer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Stephan Kramer A finite-element method is presented for calculating the quantum conductance of mesoscopic two-dimensional electron devices of complex geometry attached to semi-infinite leads. For computational purposes, the leads must be cut off at some finite length. To avoid spurious, unphysical reflections, thi... [Phys. Rev. B 88, 125308] Published Wed Sep 18, 2013

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Determination of the surface and interface phase shifts in metallic quantum well structures of perovskite oxides (2013)

K. Yoshimatsu, E. Sakai, M. Kobayashi, K. Horiba, T. Yoshida, A. Fujimori, M. Oshima, and H. Kumigashira

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): K. Yoshimatsu, E. Sakai, M. Kobayashi, K. Horiba, T. Yoshida, A. Fujimori, M. Oshima, and H. Kumigashira We propose an experimental approach to extract separately the surface and interface phase shift of standing waves in metallic quantum well (QW) structures composed of isostructural perovskite oxides. The “asymmetric” vacuum/SrVO 3 /SrTiO 3 and “symmetric” SrTiO 3 /SrVO 3 /SrTiO 3 QW structures are fabricate... [Phys. Rev. B 88, 115308] Published Thu Sep 19, 2013

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Theoretical perspective of photocatalytic properties of single-layer SnS_{2} (2013)

Houlong L. Zhuang and Richard G. Hennig

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Houlong L. Zhuang and Richard G. Hennig We present a first-principles study of the photocatalytic properties of single-layer SnS 2 . First, we calculate the formation energy and the phonon spectrum, verifying static and dynamical stability, respectively. In addition, our calculated energy of solvation suggests that single-layer SnS 2 is stab... [Phys. Rev. B 88, 115314] Published Mon Sep 30, 2013

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Unit cell structure of the wurtzite phase of GaP nanowires: X-ray diffraction studies and density functional theory calculations (2013)

Dominik Kriegner, Simone Assali, Abderrezak Belabbes, Tanja Etzelstorfer, Václav Holý, Tobias Schülli, Friedhelm Bechstedt, Erik P. A. M. Bakkers, Günther Bauer, and Julian Stangl

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Dominik Kriegner, Simone Assali, Abderrezak Belabbes, Tanja Etzelstorfer, Václav Holý, Tobias Schülli, Friedhelm Bechstedt, Erik P. A. M. Bakkers, Günther Bauer, and Julian Stangl We present structural characterization of the wurtzite crystal structure of GaP nanowires, which were recently shown to have a direct electronic band gap. The structural parameters of the wurtzite phase do consist of two lattice parameters and one internal degree of freedom, determining the Ga-P bon... [Phys. Rev. B 88, 115315] Published Mon Sep 30, 2013

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Quantifying exciton hopping in disordered media with quenching sites: Application to arrays of quantum dots (2013)

Jun Miyazaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Jun Miyazaki We present an analytical method for quantifying exciton hopping in an energetically disordered system with quenching sites. The method is subsequently used to provide a quantitative understanding of exciton hopping in a quantum dot (QD) array. Several statistical quantities that characterize the dyn... [Phys. Rev. B 88, 155302] Published Fri Oct 04, 2013

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Time constants of spin-dependent recombination processes (2013)

Felix Hoehne, Lukas Dreher, Max Suckert, David P. Franke, Martin Stutzmann, and Martin S. Brandt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Felix Hoehne, Lukas Dreher, Max Suckert, David P. Franke, Martin Stutzmann, and Martin S. Brandt We present experiments to systematically study the time constants of spin-dependent recombination processes in semiconductors using pulsed electrically detected magnetic resonance (EDMR). The combination of time-programmed optical excitation and pulsed spin manipulation allows us to directly measure... [Phys. Rev. B 88, 155301] Published Fri Oct 04, 2013

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Giant corrugations in Bi_{2}Se_{3} layers grown on high-index InP substrates (2013)

Y. Takagaki, B. Jenichen, and J. Tominaga

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Y. Takagaki, B. Jenichen, and J. Tominaga Epitaxial growth of Bi 2 Se 3 layers usually takes place in the (0001) orientation due to the stability of this surface terminated by the van der Waals bonds. Here, we show that the layers grown on InP(11 n ) substrates ( n = 3, 4, and 5) are not (0001) oriented. The approximate lattice match at the hetero... [Phys. Rev. B 87, 245302] Published Wed Jun 05, 2013

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Finite-frequency current fluctuations and self-consistent perturbation theory for electron transport through a quantum dot (2013)

Guo-Hui Ding and Bing Dong

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-07

Beschreibung: Author(s): Guo-Hui Ding and Bing Dong We formulate the problem of electron transport through an interacting quantum dot system in the framework of the self-consistent perturbation theory of the nonequilibrium Green's function and show that the current conservation through the central region is automatically guaranteed owing to the gauge... [Phys. Rev. B 87, 235303] Published Thu Jun 06, 2013

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

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Origin of negative magnetoresistance of GaAs/(Ga,Mn)As core-shell nanowires (2013)

Christian Butschkow, Elisabeth Reiger, Andreas Rudolph, Stefan Geißler, Daniel Neumaier, Marcello Soda, Dieter Schuh, Georg Woltersdorf, Werner Wegscheider, and Dieter Weiss

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-07

Beschreibung: Author(s): Christian Butschkow, Elisabeth Reiger, Andreas Rudolph, Stefan Geißler, Daniel Neumaier, Marcello Soda, Dieter Schuh, Georg Woltersdorf, Werner Wegscheider, and Dieter Weiss We explore the anisotropy of the magnetoresistance of individual GaAs/(Ga,Mn)As core-shell nanowires which feature a strong negative magnetoresistance (NMR) and a very large magnetic anisotropy field. Our analysis of the magnetoresistance shows that the resistance anisotropy is dominated by the effe... [Phys. Rev. B 87, 245303] Published Thu Jun 06, 2013

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Excitonic Rabi oscillations in self-assembled quantum dots in the presence of a local field effect (2013)

Kenta Asakura, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu, Kouichi Akahane, Naokatsu Yamamoto, Masahide Sasaki, and Naoki Ohtani

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-08

Beschreibung: Author(s): Kenta Asakura, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu, Kouichi Akahane, Naokatsu Yamamoto, Masahide Sasaki, and Naoki Ohtani We experimentally studied the excitonic Rabi oscillations in self-assembled semiconductor quantum dots using two-pulse photon echo spectroscopy. We observed the change in the shape of the Rabi oscillations by the second pulse intensity. Our experimental results were systematically reproduced by nume... [Phys. Rev. B 87, 241301] Published Fri Jun 07, 2013

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Excitonic recombination and absorption in In_{x}Ga_{1-x}As/GaAs heterostructure nanowires (2013)

Marta De Luca, Giovanna Lavenuta, Antonio Polimeni, Silvia Rubini, Vincenzo Grillo, Francesco Mura, Antonio Miriametro, Mario Capizzi, and Faustino Martelli

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Marta De Luca, Giovanna Lavenuta, Antonio Polimeni, Silvia Rubini, Vincenzo Grillo, Francesco Mura, Antonio Miriametro, Mario Capizzi, and Faustino Martelli Photoluminescence (PL), micro-PL, and PL excitation (PLE) spectroscopy for different light polarizations have been used to investigate the electronic properties of GaAs characterized by a dominant wurtzite (WZ) phase that forms in bare GaAs and in InGaAs/GaAs heterostructure (HS) nanowires (NWs). In... [Phys. Rev. B 87, 235304] Published Mon Jun 10, 2013

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Chiral gauge field and axial anomaly in a Weyl semimetal (2013)

Chao-Xing Liu, Peng Ye, and Xiao-Liang Qi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Chao-Xing Liu, Peng Ye, and Xiao-Liang Qi Weyl fermions are two-component chiral fermions in (3+1) dimensions. When coupled to a gauge field, the Weyl fermion is known to have an axial anomaly, which means the current conservation of the left-handed and right-handed Weyl fermions cannot be preserved separately. Recently, Weyl fermions have ... [Phys. Rev. B 87, 235306] Published Mon Jun 10, 2013

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Simulated doping of Si from first principles using pseudoatoms (2013)

Ofer Sinai and Leeor Kronik

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Ofer Sinai and Leeor Kronik Semiconductor doping is a process of fundamental importance to semiconductor physics and solid-state electronics, but cannot be explicitly simulated from first principles due to the huge system size needed for most doping scenarios. We examine the efficacy of the simulation of doping in silicon by t... [Phys. Rev. B 87, 235305] Published Mon Jun 10, 2013

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Postselected indistinguishable single-photon emission from the Mollow triplet sidebands of a resonantly excited quantum dot (2013)

S. Weiler, D. Stojanovic, S. M. Ulrich, M. Jetter, and P. Michler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): S. Weiler, D. Stojanovic, S. M. Ulrich, M. Jetter, and P. Michler Applying high-power continuous-wave resonant s -shell excitation to a single self-assembled InGaAs quantum dot, we demonstrate the generation of postselected single-indistinguishable photons from the Mollow triplet sidebands. A sophisticated spatial filtering technique based on a double Michelson int... [Phys. Rev. B 87, 241302] Published Mon Jun 10, 2013

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Efficient upconverted photocurrent through an Auger process in disklike InAs quantum structures for intermediate-band solar cells (2013)

David M. Tex, Itaru Kamiya, and Yoshihiko Kanemitsu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): David M. Tex, Itaru Kamiya, and Yoshihiko Kanemitsu The mechanisms of upconverted photocurrent in InAs quantum structures embedded in Al x Ga 1− x As were studied with simultaneous measurements of photoluminescence and photocurrent spectra. Efficient upconversion was verified in samples with and without quantum dots. The dominant upconversion process from... [Phys. Rev. B 87, 245305] Published Mon Jun 10, 2013

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Subnanosecond magnetization dynamics induced by a pulsed magnetic field in diluted magnetic semiconductor quantum wells (2013)

Y. S. Chen, M. Wiater, G. Karczewski, T. Wojtowicz, and G. Bacher

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-04

Beschreibung: Author(s): Y. S. Chen, M. Wiater, G. Karczewski, T. Wojtowicz, and G. Bacher The magnetization dynamics induced by a pulsed magnetic field is investigated by time- and polarization-resolved photoluminescene measurements in (Cd,Mn)Te/(Cd,Mg)Te quantum wells. The magnetization dynamics of Mn 2+ ions is found to be strongly dependent on the external static magnetic field. A dyna... [Phys. Rev. B 87, 155301] Published Wed Apr 03, 2013

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Controlled incorporation of Mn in GaAs: Role of surface reconstructions (2013)

Akihiro Ohtake, Atsushi Hagiwara, and Jun Nakamura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-06

Beschreibung: Author(s): Akihiro Ohtake, Atsushi Hagiwara, and Jun Nakamura A combined experimental and theoretical study on the incorporation of Mn in GaAs has been presented. We have successfully controlled the location of Mn atoms at GaAs(001) surfaces by changing the surface atomic geometry. While Mn atoms prefer to substitute Ga sites at a subsurface layer under the As... [Phys. Rev. B 87, 165301] Published Fri Apr 05, 2013

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Chemical trend of the formation energies of the group-III and group-V dopants in Si quantum dots (2013)

Jie Ma and Su-Huai Wei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-03-30

Beschreibung: Author(s): Jie Ma and Su-Huai Wei Doping behavior in quantum dots (QDs) differs from that in the bulk. Despite many efforts, the doping properties are still not fully understood. Using first-principles methods, we have calculated the formation energies of various group-III acceptors and group-V donors doping at all nonequivalent sit... [Phys. Rev. B 87, 115318] Published Fri Mar 29, 2013

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Quasiparticle band structures and optical properties of strained monolayer MoS_{2} and WS_{2} (2013)

Hongliang Shi, Hui Pan, Yong-Wei Zhang, and Boris I. Yakobson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-10

Beschreibung: Author(s): Hongliang Shi, Hui Pan, Yong-Wei Zhang, and Boris I. Yakobson The quasiparticle (QP) band structures of both strainless and strained monolayer MoS 2 are investigated using more accurate many-body perturbation GW theory and maximally localized Wannier functions (MLWFs) approach. By solving the Bethe-Salpeter equation (BSE) including excitonic effects on top of t... [Phys. Rev. B 87, 155304] Published Tue Apr 09, 2013

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Strain tuning of optical emission energy and polarization in monolayer and bilayer MoS_{2} (2013)

C. R. Zhu, G. Wang, B. L. Liu, X. Marie, X. F. Qiao, X. Zhang, X. X. Wu, H. Fan, P. H. Tan, T. Amand, and B. Urbaszek

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): C. R. Zhu, G. Wang, B. L. Liu, X. Marie, X. F. Qiao, X. Zhang, X. X. Wu, H. Fan, P. H. Tan, T. Amand, and B. Urbaszek We use micro-Raman and photoluminescence (PL) spectroscopy at 300 K to investigate the influence of uniaxial tensile strain on the vibrational and optoelectronic properties of monolayer and bilayer MoS 2 on a flexible substrate. The initially degenerate E ′ monolayer Raman mode is split into a doublet... [Phys. Rev. B 88, 121301] Published Mon Sep 09, 2013

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Fine structure of the lowest Landau level in suspended trilayer graphene (2013)

H. J. van Elferen, A. Veligura, N. Tombros, E. V. Kurganova, B. J. van Wees, J. C. Maan, and U. Zeitler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): H. J. van Elferen, A. Veligura, N. Tombros, E. V. Kurganova, B. J. van Wees, J. C. Maan, and U. Zeitler Magnetotransport experiments on ABC-stacked suspended trilayer graphene reveal a complete splitting of the 12-fold degenerated lowest Landau level, and, in particular, the opening of an exchange-driven gap at the charge neutrality point. A quantitative analysis of distinctness of the quantum Hall pl... [Phys. Rev. B 88, 121302] Published Mon Sep 09, 2013

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Relative intensity noise and emission linewidth of polariton laser diodes (2013)

Marlene Glauser and Raphaël Butté

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): Marlene Glauser and Raphaël Butté We study the relative intensity noise (RIN) per unit bandwidth in polariton laser diodes (LDs) for two pumping geometries, namely, the direct electrical and the intracavity ones as originally described in I. Iorsh et al. [ Phys. Rev. B 86 125308 (2012) ], by using rate equations including Langevin n... [Phys. Rev. B 88, 115305] Published Fri Sep 13, 2013

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Collective quantum dot inversion and amplification of photon and phonon waves (2013)

Sumanta Das and Mihai A. Macovei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): Sumanta Das and Mihai A. Macovei The possibility of steady-state population inversion in a small sample of strongly driven two-level emitters such as quantum dots (QDs) in microcavities, and its utilization towards amplification of light and acoustic waves, is investigated theoretically. We find that inversion and absorption spectr... [Phys. Rev. B 88, 125306] Published Fri Sep 13, 2013

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Hydrostatic strain enhancement in laterally confined SiGe nanostripes (2013)

G. M. Vanacore, M. Chaigneau, N. Barrett, M. Bollani, F. Boioli, M. Salvalaglio, F. Montalenti, N. Manini, L. Caramella, P. Biagioni, D. Chrastina, G. Isella, O. Renault, M. Zani, R. Sordan, G. Onida, R. Ossikovski, H.-J. Drouhin, and A. Tagliaferri

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): G. M. Vanacore, M. Chaigneau, N. Barrett, M. Bollani, F. Boioli, M. Salvalaglio, F. Montalenti, N. Manini, L. Caramella, P. Biagioni, D. Chrastina, G. Isella, O. Renault, M. Zani, R. Sordan, G. Onida, R. Ossikovski, H.-J. Drouhin, and A. Tagliaferri Strain engineering in SiGe nanostructures is fundamental for the design of optoelectronic devices at the nanoscale. Here we explore a new strategy, where SiGe structures are laterally confined by the Si substrate, to obtain high tensile strain yet avoid the use of external stressors, thus improving ... [Phys. Rev. B 88, 115309] Published Fri Sep 20, 2013

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Doping efficiency in n-type InP nanowires (2013)

Lucas V. Besteiro, Luis Tortajada, J. Souto, L. J. Gallego, James R. Chelikowsky, and M. M. G. Alemany

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Lucas V. Besteiro, Luis Tortajada, J. Souto, L. J. Gallego, James R. Chelikowsky, and M. M. G. Alemany We examine two factors that could limit the doping of n -type III-V semiconductor nanowires, namely, the solubility of the dopants and the possible formation of D X -like defect centers. We find that it is preferable to dope zinc-blende nanowires via anion substitution as opposed to cation substitution... [Phys. Rev. B 88, 115310] Published Fri Sep 20, 2013

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Atomic and electronic structure of GaP/Si(111), GaP/Si(110), and GaP/Si(113) interfaces and superlattices studied by density functional theory (2013)

O. Romanyuk, T. Hannappel, and F. Grosse

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): O. Romanyuk, T. Hannappel, and F. Grosse The atomic structure of GaP(111)/Si(111), GaP(110)/Si(110), and GaP(113)/Si(113) heterointerfaces was studied by ab initio calculations employing the density functional theory (DFT). Relative formation energies were computed for the interface layers allowing for atomic intermixing. The application o... [Phys. Rev. B 88, 115312] Published Mon Sep 23, 2013

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Anomalous quantum confinement of the longitudinal optical phonon mode in PbSe quantum dots (2013)

J. Habinshuti, O. Kilian, O. Cristini-Robbe, A. Sashchiuk, A. Addad, S. Turrell, E. Lifshitz, B. Grandidier, and L. Wirtz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-25

Beschreibung: Author(s): J. Habinshuti, O. Kilian, O. Cristini-Robbe, A. Sashchiuk, A. Addad, S. Turrell, E. Lifshitz, B. Grandidier, and L. Wirtz We have investigated the diameter dependence of the Raman spectra of lead selenide nanocrystals. The first-order Raman peak at about 136 cm −1 and its second-order overtone at twice this wavenumber move up in energy with decreasing nanocrystal diameter. This anomalous behavior is interpreted in terms... [Phys. Rev. B 88, 115313] Published Tue Sep 24, 2013

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Frequency anomaly in the Rashba-effect induced magnetization oscillations of a high-mobility two-dimensional electron system (2013)

B. Rupprecht, S. Heedt, H. Hardtdegen, Th. Schäpers, Ch. Heyn, M. A. Wilde, and D. Grundler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-01-17

Beschreibung: Author(s): B. Rupprecht, S. Heedt, H. Hardtdegen, Th. Schäpers, Ch. Heyn, M. A. Wilde, and D. Grundler With the direct measurement of the quantum oscillatory magnetization M of a two-dimensional electron system (2DES) in an InGaAs/InP asymmetric quantum well we discover a frequency anomaly of the de Haas–van Alphen effect which is not consistent with existing theories on spin-orbit interaction (SOI).... [Phys. Rev. B 87, 035307] Published Wed Jan 16, 2013

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Electron spin resonance observation of charge carrier concentration in organic field-effect transistors during device operation (2013)

Hisaaki Tanaka, Masataka Hirate, Shun-ichiro Watanabe, Kazuaki Kaneko, Kazuhiro Marumoto, Taishi Takenobu, Yoshihiro Iwasa, and Shin-ichi Kuroda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-01-19

Beschreibung: Author(s): Hisaaki Tanaka, Masataka Hirate, Shun-ichiro Watanabe, Kazuaki Kaneko, Kazuhiro Marumoto, Taishi Takenobu, Yoshihiro Iwasa, and Shin-ichi Kuroda Charge carrier concentration in operating organic field-effect transistors (OFETs) reflects the electric potential within the channel, acting as a key quantity to clarify the operation mechanism of the device. Here, we demonstrate a direct determination of charge carrier concentration in the operati... [Phys. Rev. B 87, 045309] Published Fri Jan 18, 2013

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Magneto-photoluminescence of charged excitons from Mg_{x}Zn_{1−x}O/ZnO heterojunctions (2013)

T. Makino, Y. Segawa, A. Tsukazaki, H. Saito, S. Takeyama, S. Akasaka, K. Nakahara, and M. Kawasaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-21

Beschreibung: Author(s): T. Makino, Y. Segawa, A. Tsukazaki, H. Saito, S. Takeyama, S. Akasaka, K. Nakahara, and M. Kawasaki We report on the photoluminescence (PL) properties of Mg x Zn 1− x O/ZnO heterojunctions grown by plasma-assisted molecular-beam epitaxy. Influence of the applied magnetic field ( B ) on the radiative recombination of the two-dimensional electron gas (2DEG) is investigated up to 54 T. An increase in magnet... [Phys. Rev. B 87, 085312] Published Wed Feb 20, 2013

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First-principles calculation of scattering potentials of Si-Ge and Sn-Ge dimers on Ge(001) surfaces (2013)

Tomoya Ono

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-21

Beschreibung: Author(s): Tomoya Ono The scattering potential of the defects on Ge(001) surfaces is investigated by first-principles methods. The standing wave in the spatial map of the local density of states obtained by wave-function matching is compared to the image of the differential conductance measured by scanning tunneling spec... [Phys. Rev. B 87, 085311] Published Wed Feb 20, 2013

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Electron scattering by a steplike defect in topological insulator nanofilms (2013)

Thakshila M. Herath, Prabath Hewageegana, and Vadym Apalkov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-22

Beschreibung: Author(s): Thakshila M. Herath, Prabath Hewageegana, and Vadym Apalkov We study the properties of a steplike defect on the surface of ultrathin topological insulator nanofilms. We calculate the reflectance of an electron from such a defect for different parameters of the nanofilm and different parameters of the defect. We show that an electron incident on a steplike de... [Phys. Rev. B 87, 075318] Published Thu Feb 21, 2013

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Stabilization mechanism for the polar ZnO(0001[over ¯])-O surface (2013)

Roman Wahl, Jeppe V. Lauritsen, Flemming Besenbacher, and Georg Kresse

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-22

Beschreibung: Author(s): Roman Wahl, Jeppe V. Lauritsen, Flemming Besenbacher, and Georg Kresse When wurtzite ZnO is sliced perpendicular to the (0001) axis, two different polar surfaces, the (0001)-Zn and (0001̅ )-O terminated surfaces, are formed. In a simple ionic picture, both surfaces are electrostatically unstable due to a diverging electrostatic energy. Although the ionic picture... [Phys. Rev. B 87, 085313] Published Thu Feb 21, 2013

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Spontaneous vortices in optically shaped potential profiles in semiconductor microcavities (2013)

K. Guda, M. Sich, D. Sarkar, P. M. Walker, M. Durska, R. A. Bradley, D. M. Whittaker, M. S. Skolnick, E. A. Cerda-Méndez, P. V. Santos, K. Biermann, R. Hey, and D. N. Krizhanovskii

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-22

Beschreibung: Author(s): K. Guda, M. Sich, D. Sarkar, P. M. Walker, M. Durska, R. A. Bradley, D. M. Whittaker, M. S. Skolnick, E. A. Cerda-Méndez, P. V. Santos, K. Biermann, R. Hey, and D. N. Krizhanovskii We investigate the spontaneous formation of quantized vortices in microcavity polariton high density phases. Condensates formed in the optical parametric oscillator excitation scheme reveal single vortices in the case of a ring-shaped optical potential or in the presence of natural photonic disorder... [Phys. Rev. B 87, 081309] Published Thu Feb 21, 2013

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Crossover from adiabatic to antiadiabatic phonon-assisted tunneling in single-molecule transistors (2013)

Eitan Eidelstein, Dotan Goberman, and Avraham Schiller

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-23

Beschreibung: Author(s): Eitan Eidelstein, Dotan Goberman, and Avraham Schiller The crossover between two customary limits of phonon-assisted tunneling, the adiabatic and antiadiabatic regimes, is studied systematically in the framework of a minimal model for molecular devices: a resonant level coupled by displacement to a localized vibrational mode. Conventionally associated w... [Phys. Rev. B 87, 075319] Published Fri Feb 22, 2013

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Strain and band-mixing effects on the excitonic Aharonov-Bohm effect in In(Ga)As/GaAs ringlike quantum dots (2013)

Vladimir V. Arsoski, Milan Ž. Tadić, and François M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-23

Beschreibung: Author(s): Vladimir V. Arsoski, Milan Ž. Tadić, and François M. Peeters Neutral excitons in strained axially symmetric In(Ga)As/GaAs quantum dots with a ringlike shape are investigated. Similar to experimental self-assembled quantum rings, the analyzed quantum dots have volcano-like shapes. The continuum mechanical model is employed to determine the strain distribution,... [Phys. Rev. B 87, 085314] Published Fri Feb 22, 2013

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Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots (2013)

M. V. Durnev, M. M. Glazov, E. L. Ivchenko, M. Jo, T. Mano, T. Kuroda, K. Sakoda, S. Kunz, G. Sallen, L. Bouet, X. Marie, D. Lagarde, T. Amand, and B. Urbaszek

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-23

Beschreibung: Author(s): M. V. Durnev, M. M. Glazov, E. L. Ivchenko, M. Jo, T. Mano, T. Kuroda, K. Sakoda, S. Kunz, G. Sallen, L. Bouet, X. Marie, D. Lagarde, T. Amand, and B. Urbaszek We present a microscopic theory of the magnetic field induced mixing of heavy-hole states ±3/2 in GaAs droplet dots grown on (111)A Ga-rich surfaces. The proposed theoretical model takes into account the striking dot shape with trigonal symmetry revealed in atomic force microscopy. Our calculations ... [Phys. Rev. B 87, 085315] Published Fri Feb 22, 2013

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Measurement of photoluminescence spectral linewidth of a GaAs quantum well in perpendicular electric fields: Evidence of a crossover from trions to an electron-hole gas (2013)

M. Yamaguchi, S. Nomura, H. Tamura, and T. Akazaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-26

Beschreibung: Author(s): M. Yamaguchi, S. Nomura, H. Tamura, and T. Akazaki By measuring the photoluminescence linewidth of a GaAs quantum well under perpendicular electric fields, we have traced the variation of the effective radius a * of a charged exciton (trion) as a function of electron density. The a * increases sharply above a critical density n s =2×10 14 m −2 , which is c... [Phys. Rev. B 87, 081310] Published Mon Feb 25, 2013

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Coherent edge mixing and interferometry in quantum Hall bilayers (2013)

Stefano Roddaro, Luca Chirolli, Fabio Taddei, Marco Polini, and Vittorio Giovannetti

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-26

Beschreibung: Author(s): Stefano Roddaro, Luca Chirolli, Fabio Taddei, Marco Polini, and Vittorio Giovannetti We discuss the implementation of a beam splitter for electron waves in a quantum Hall bilayer. Our architecture exploits interlayer tunneling to mix edge states belonging to different layers. We discuss the basic working principle of the proposed coherent edge mixer, possible interferometric impleme... [Phys. Rev. B 87, 075321] Published Mon Feb 25, 2013

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Considerations for surface reconstruction stability prediction on GaAs(001) (2013)

John C. Thomas, Anton Van der Ven, Joanna Mirecki Millunchick, and Normand A. Modine

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-26

Beschreibung: Author(s): John C. Thomas, Anton Van der Ven, Joanna Mirecki Millunchick, and Normand A. Modine We present a theoretical analysis of the finite-temperature equilibrium surface reconstruction stability of GaAs(001) from first principles, encompassing the As-rich regime relevant to low-temperature grown GaAs. Experimental evidence points to the thermodynamic stability of a (4×3) reconstruction i... [Phys. Rev. B 87, 075320] Published Mon Feb 25, 2013

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Heterobarrier for converting hot-phonon energy to electric potential (2013)

Seungha Shin, Corey Melnick, and Massoud Kaviany

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-20

Beschreibung: Author(s): Seungha Shin, Corey Melnick, and Massoud Kaviany We show that hot phonons emitted in energy conversion or resistive processes can be converted to electric potential in heterobarrier structures. Using phonon and electron interaction kinetics and self-consistent ensemble Monte Carlo, we find the favorable conditions for unassisted absorption of hot ... [Phys. Rev. B 87, 075317] Published Tue Feb 19, 2013

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Parametric inversion of spin currents in semiconductor microcavities (2013)

H. Flayac, D. D. Solnyshkov, G. Malpuech, and I. A. Shelykh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-20

Beschreibung: Author(s): H. Flayac, D. D. Solnyshkov, G. Malpuech, and I. A. Shelykh The optical spin-Hall effect results in the formation of an antisymmetric real-space polarization pattern giving birth to spin currents. In this work, we show that the exciton-polariton parametric scattering allows us to reverse the sign of these currents. We describe the pulsed resonant excitation ... [Phys. Rev. B 87, 075316] Published Tue Feb 19, 2013

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Surface structure and equilibrium particle shape of the LiMn_{2}O_{4} spinel from first-principles calculations (2013)

Altaf Karim, Sonia Fosse, and Kristin A. Persson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-27

Beschreibung: Author(s): Altaf Karim, Sonia Fosse, and Kristin A. Persson First-principles density functional calculations were used to calculate surface properties of the LiMn 2 O 4 spinel. The calculations were benchmarked to obtain the correct semiconducting, Jahn-Teller distorted electronic ground state of bulk LiMn 2 O 4 and, using the same parameters, the predominant low-... [Phys. Rev. B 87, 075322] Published Tue Feb 26, 2013

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Role of geometry for strong coupling in active terahertz metamaterials (2013)

Daniel Dietze, Karl Unterrainer, and Juraj Darmo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-03-01

Beschreibung: Author(s): Daniel Dietze, Karl Unterrainer, and Juraj Darmo We discuss the influence of geometry and type of meta-atom resonance on important parameters for strong and ultrastrong light-matter coupling experiments based on localized plasmons in planar metamaterials and intersubband plasmons in quantum wells. An analytic model based on the density matrix form... [Phys. Rev. B 87, 075324] Published Thu Feb 28, 2013

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Hybrid functional versus quasiparticle calculations for the Schottky barrier and effective work function at TiN/HfO_{2} interface (2013)

Young Jun Oh, Alex Taekyung Lee, Hyeon-Kyun Noh, and K. J. Chang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-03-01

Beschreibung: Author(s): Young Jun Oh, Alex Taekyung Lee, Hyeon-Kyun Noh, and K. J. Chang We investigate the Schottky barrier and effective work function (EWF) at TiN/HfO 2 interface through density functional calculations. For different interfaces that consist of either Ti-O or N-Hf interface bonds, the intrinsic metal-induced gap states are nearly independent of the interface structure,... [Phys. Rev. B 87, 075325] Published Thu Feb 28, 2013

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Hot-carrier transport and spin relaxation on the surface of topological insulator (2013)

P. Zhang and M. W. Wu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-27

Beschreibung: Author(s): P. Zhang and M. W. Wu We study the charge and spin transport under high electric field (up to several kilovolts per centimeter) on the surface of topological insulator Bi 2 Se 3 , where the electron-surface optical phonon scattering dominates except at very low temperature. Due to the spin mixing of conduction and valence ba... [Phys. Rev. B 87, 085319] Published Tue Feb 26, 2013

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Effect of symmetry reduction on the spin dynamics of (001)-oriented GaAs quantum wells (2013)

D. J. English, J. Hübner, P. S. Eldridge, D. Taylor, M. Henini, R. T. Harley, and M. Oestreich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-07

Beschreibung: Author(s): D. J. English, J. Hübner, P. S. Eldridge, D. Taylor, M. Henini, R. T. Harley, and M. Oestreich Spin quantum beat spectroscopy is employed to investigate the in-plane anisotropy of the spin dynamics in (001) GaAs/AlGaAs quantum wells induced by an external electric field. This technique allows the anisotropy of the spin relaxation rate Γ s and the electron Landé g factor g * to be measured simul... [Phys. Rev. B 87, 075304] Published Wed Feb 06, 2013

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Adiabatic pumping through an interacting quantum dot with spin-orbit coupling (2013)

Stephan Rojek, Jürgen König, and Alexander Shnirman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-07

Beschreibung: Author(s): Stephan Rojek, Jürgen König, and Alexander Shnirman We study adiabatic pumping through a two-level quantum dot with spin-orbit coupling. Using a diagrammatic real-time approach, we calculate both the pumped charge and spin for a periodic variation of the dot's energy levels in the limit of weak tunnel coupling. Thereby, we compare the two limits of v... [Phys. Rev. B 87, 075305] Published Wed Feb 06, 2013

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Selective excitation of zone-folded phonon modes within one triplet in a semiconductor superlattice (2013)

D. C. Heinecke, O. Kliebisch, J. Flock, A. Bruchhausen, K. Köhler, and T. Dekorsy

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-08

Beschreibung: Author(s): D. C. Heinecke, O. Kliebisch, J. Flock, A. Bruchhausen, K. Köhler, and T. Dekorsy The selective optical excitation of coherent zone-folded acoustic phonon modes in a semiconductor superlattice is demonstrated. By using a time-delayed control pulse, we show the modification of phonon amplitudes within a phonon triplet and demonstrate that the phase relation of phonon modes can be ... [Phys. Rev. B 87, 075307] Published Thu Feb 07, 2013

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Coulomb matrix elements for the impact ionization process in nanocrystals: An envelope function approach (2013)

Piotr Kowalski, Łukasz Marcinowski, and Paweł Machnikowski

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-09

Beschreibung: Author(s): Piotr Kowalski, Łukasz Marcinowski, and Paweł Machnikowski We propose a method for calculating Coulomb matrix elements between exciton and biexciton states in semiconductor nanocrystals based on the envelope function formalism. We show that such a calculation requires proper treatment of the Bloch parts of the carrier wave functions, which, in the leading o... [Phys. Rev. B 87, 075309] Published Fri Feb 08, 2013

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As vacancies, Ga antisites, and Au impurities in zinc blende and wurtzite GaAs nanowire segments from first principles (2013)

Yaojun A. Du, Sung Sakong, and Peter Kratzer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-09

Beschreibung: Author(s): Yaojun A. Du, Sung Sakong, and Peter Kratzer In this paper some specific issues related to point defects in GaAs nanowires are addressed with the help of density functional theory calculations. These issues mainly arise from the growth of nanowires under conditions different from those used for thin film or bulk GaAs, such as the coexistence o... [Phys. Rev. B 87, 075308] Published Fri Feb 08, 2013

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Resistive detection of nuclear spins in a single quantum dot under Kondo effect regime (2013)

M. Kawamura, D. Gottwald, K. Ono, T. Machida, and K. Kono

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-09

Beschreibung: Author(s): M. Kawamura, D. Gottwald, K. Ono, T. Machida, and K. Kono We study dynamic polarization and resistive detection of nuclear spins in a semiconductor quantum dot (QD) under the Kondo effect regime. We find that the differential conductance spectra of the QD exhibit hysteresis under the Kondo effect regime in magnetic fields. Relevance of nuclear spins to the... [Phys. Rev. B 87, 081303] Published Fri Feb 08, 2013

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Cleavage induced rows of missing atoms on ZnTe (110) surface (2013)

C. Çelebi, O. Arı, and R. T. Senger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-15

Beschreibung: Author(s): C. Çelebi, O. Arı, and R. T. Senger Cleavage induced rows of linear vacancy structures on p -doped ZnTe (110) surface are studied at room temperature by using cross-sectional scanning tunneling microscopy (X-STM). The oscillating contrast superimposed on the Te-driven occupied states neighboring to the vacancy cores are characterized a... [Phys. Rev. B 87, 085308] Published Thu Feb 14, 2013

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Spin thermoelectrics in a disordered Fermi gas (2013)

J. Borge, C. Gorini, and R. Raimondi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-15

Beschreibung: Author(s): J. Borge, C. Gorini, and R. Raimondi We study the connection between the spin-heat and spin-charge response in a disordered Fermi gas with spin-orbit coupling. It is shown that the ratio between the above responses can be expressed as the thermopower S =−( π k B ) 2 T σ ′ /3 e σ times a number R s which depends on the strength and type of the spin-... [Phys. Rev. B 87, 085309] Published Thu Feb 14, 2013

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Long spin relaxation time of holes in InGaAs/GaAs quantum wells probed by cyclotron resonance spectroscopy (2013)

O. Drachenko, D. Kozlov, A. V. Ikonnikov, K. E. Spirin, V. Gavrilenko, H. Schneider, M. Helm, and J. Wosnitza

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-16

Beschreibung: Author(s): O. Drachenko, D. Kozlov, A. V. Ikonnikov, K. E. Spirin, V. Gavrilenko, H. Schneider, M. Helm, and J. Wosnitza In this paper, we report on a long, ms range, hole spin relaxation time in InGaAs/GaAs quantum wells probed by cyclotron resonance spectroscopy in pulsed magnetic fields. In our experiments, we found strong hysteresis in the spectral weights of cyclotron resonance absorption lines when rapidly chang... [Phys. Rev. B 87, 075315] Published Fri Feb 15, 2013

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Spin and charge distribution symmetry dependence of stripe phases in two-dimensional electron systems confined to wide quantum wells (2013)

Yang Liu, D. Kamburov, M. Shayegan, L. N. Pfeiffer, K. W. West, and K. W. Baldwin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-16

Beschreibung: Author(s): Yang Liu, D. Kamburov, M. Shayegan, L. N. Pfeiffer, K. W. West, and K. W. Baldwin Measurements in clean two-dimensional electron systems confined to wide GaAs quantum wells in which two electric subbands are occupied reveal an unexpected rotation of the orientation of the stripe phase observed at a half-filled Landau level. Remarkably, the reorientation is sensitive to the spin o... [Phys. Rev. B 87, 075314] Published Fri Feb 15, 2013

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Raman-scattering measurements and first-principles calculations of strain-induced phonon shifts in monolayer MoS_{2} (2013)

C. Rice, R. J. Young, R. Zan, U. Bangert, D. Wolverson, T. Georgiou, R. Jalil, and K. S. Novoselov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-16

Beschreibung: Author(s): C. Rice, R. J. Young, R. Zan, U. Bangert, D. Wolverson, T. Georgiou, R. Jalil, and K. S. Novoselov The effect of strain on the phonon modes of monolayer and few-layer MoS 2 has been investigated by observing the strain-induced shifts of the Raman-active modes. Uniaxial strain was applied to a sample of thin-layer MoS 2 sandwiched between two layers of optically transparent polymer. The resulting ba... [Phys. Rev. B 87, 081307] Published Fri Feb 15, 2013

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Interplay of topological surface and bulk electronic states in Bi_{2}Se_{3} (2013)

Megan Romanowich, Mal-Soon Lee, Duck-Young Chung, S. D. Mahanti, Mercouri G. Kanatzidis, and Stuart H. Tessmer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-16

Beschreibung: Author(s): Megan Romanowich, Mal-Soon Lee, Duck-Young Chung, S. D. Mahanti, Mercouri G. Kanatzidis, and Stuart H. Tessmer In this paper we present scanning tunneling microscopy density-of-states measurements and electronic structure calculations of the topological insulator Bi 2 Se 3 . The measurements show significant background states in addition to the expected Dirac cone. Density-functional calculations using a slab mo... [Phys. Rev. B 87, 085310] Published Fri Feb 15, 2013

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Valley-dependent two-dimensional transport in (100), (110), and (111) Si inversion layers at low temperatures and carrier densities (2013)

E. H. Hwang and S. Das Sarma

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-08

Beschreibung: Author(s): E. H. Hwang and S. Das Sarma Motivated by interesting recent experimental results, we consider theoretically charged-impurity scattering-limited two-dimensional (2D) electronic transport in (100), (110), and (111)-Si inversion layers at low temperatures and carrier densities, where screening effects are important. We show concl... [Phys. Rev. B 87, 075306] Published Thu Feb 07, 2013

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Schrödinger-Poisson calculations for scanning gate microscopy of quantum rings based on etched two-dimensional electron gas (2013)

T. Chwiej and B. Szafran

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-07

Beschreibung: Author(s): T. Chwiej and B. Szafran We present a systematic numerical simulation of the scanning gate microscopy experiment as performed on a quantum ring etched out of InGaAs/InAlAs heterostructure containing two-dimensional electron gas (2DEG). The present simulation accounts for 2DEG deformation under the presence of the tip, for m... [Phys. Rev. B 87, 085302] Published Wed Feb 06, 2013

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Biexciton state preparation in a quantum dot via adiabatic rapid passage: Comparison between two control protocols and impact of phonon-induced dephasing (2013)

M. Glässl, A. M. Barth, K. Gawarecki, P. Machnikowski, M. D. Croitoru, S. Lüker, D. E. Reiter, T. Kuhn, and V. M. Axt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-09

Beschreibung: Author(s): M. Glässl, A. M. Barth, K. Gawarecki, P. Machnikowski, M. D. Croitoru, S. Lüker, D. E. Reiter, T. Kuhn, and V. M. Axt We investigate theoretically under what conditions a stable and high-fidelity preparation of the biexciton state in a quantum dot can be realized by means of adiabatic rapid passage in the presence of acoustic phonon coupling. Our analysis is based on a numerically complete real-time path-integral a... [Phys. Rev. B 87, 085303] Published Fri Feb 08, 2013

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Thermoelectric response of fractional quantized Hall and reentrant insulating states in the N=1 Landau level (2013)

W. E. Chickering, J. P. Eisenstein, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-05

Beschreibung: Author(s): W. E. Chickering, J. P. Eisenstein, L. N. Pfeiffer, and K. W. West Detailed measurements of the longitudinal thermopower of two-dimensional electrons in the first excited Landau level are reported. Clear signatures of numerous fractional quantized Hall states, including those at ν =5/2 and 7/3, are observed in the magnetic field and temperature dependence of the the... [Phys. Rev. B 87, 075302] Published Mon Feb 04, 2013

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Electron transfer in hydrogenated nanocrystalline silicon observed by time-resolved terahertz spectroscopy (2013)

Matthew R. Bergren, Brian J. Simonds, Baojie Yan, Guozhen Yue, Richard Ahrenkiel, Thomas E. Furtak, Reuben T. Collins, P. Craig Taylor, and Matthew C. Beard

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-05

Beschreibung: Author(s): Matthew R. Bergren, Brian J. Simonds, Baojie Yan, Guozhen Yue, Richard Ahrenkiel, Thomas E. Furtak, Reuben T. Collins, P. Craig Taylor, and Matthew C. Beard We report on the ultrafast carrier dynamics in hydrogenated nanocrystalline silicon (nc-Si:H) using time-resolved terahertz spectroscopy. Photoexcitation at 407 nm primarily produces charge carriers in the a -Si phase, but they undergo a rapid electron transfer to the c -Si phase prior to complete the... [Phys. Rev. B 87, 081301] Published Mon Feb 04, 2013

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Unitarity of scattering and edge spin accumulation (2013)

Alexander Khaetskii and Eugene Sukhorukov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-05

Beschreibung: Author(s): Alexander Khaetskii and Eugene Sukhorukov We consider a two-dimensional (2D) ballistic and quasiballistic structures with spin-orbit-related splitting of the electron spectrum. The ballistic region is attached to the leads with a voltage applied between them. We calculate the edge spin density which arises in the presence of a charge curren... [Phys. Rev. B 87, 075303] Published Mon Feb 04, 2013

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Theoretical investigation of direct and phonon-assisted tunneling currents in InAlGaAs/InGaAs bulk and quantum-well interband tunnel junctions for multijunction solar cells (2013)

U. Aeberhard

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-06

Beschreibung: Author(s): U. Aeberhard Direct and phonon-assisted tunneling currents in InAlGaAs-InGaAs bulk and double-quantum-well interband tunnel heterojunctions are simulated rigorously using the nonequilibrium Green's function formalism for coherent and dissipative quantum transport in combination with a simple two-band tight-bindi... [Phys. Rev. B 87, 081302] Published Tue Feb 05, 2013

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Magnetic-field-influenced nonequilibrium transport through a quantum ring with correlated electrons in a photon cavity (2013)

Thorsten Arnold, Chi-Shung Tang, Andrei Manolescu, and Vidar Gudmundsson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-01

Beschreibung: Author(s): Thorsten Arnold, Chi-Shung Tang, Andrei Manolescu, and Vidar Gudmundsson We investigate magnetic-field-influenced time-dependent transport of Coulomb interacting electrons through a two-dimensional quantum ring in an electromagnetic cavity under nonequilibrium conditions described by a time-convolutionless non-Markovian master equation formalism. We take into account the... [Phys. Rev. B 87, 035314] Published Thu Jan 31, 2013

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Extrinsic spin Nernst effect in two-dimensional electron systems (2013)

Hiroshi Akera and Hidekatsu Suzuura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-02-02

Beschreibung: Author(s): Hiroshi Akera and Hidekatsu Suzuura The spin accumulation due to the spin current induced by the perpendicular temperature gradient (the spin Nernst effect) is studied in a two-dimensional electron system (2DES) with spin-orbit interaction by employing the Boltzmann equation. The considered 2DES is confined within a symmetric quantum ... [Phys. Rev. B 87, 075301] Published Fri Feb 01, 2013

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Nongalvanic primary thermometry of a two-dimensional electron gas (2013)

P. Torresani, M. J. Martínez-Pérez, S. Gasparinetti, J. Renard, G. Biasiol, L. Sorba, F. Giazotto, and S. De Franceschi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-07

Beschreibung: Author(s): P. Torresani, M. J. Martínez-Pérez, S. Gasparinetti, J. Renard, G. Biasiol, L. Sorba, F. Giazotto, and S. De Franceschi We report the experimental realization of a nongalvanic, primary thermometer capable of measuring the electron temperature of a two-dimensional electron gas with negligible thermal load. Such a thermometer consists of a quantum dot whose temperature-dependent, single-electron transitions are detecte... [Phys. Rev. B 88, 245304] Published Fri Dec 06, 2013

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Completely flat bands and fully localized states on surfaces of anisotropic diamond-lattice models (2013)

Ryuji Takahashi and Shuichi Murakami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-11

Beschreibung: Author(s): Ryuji Takahashi and Shuichi Murakami We discuss flat-band surface states on the (111) surface in the tight-binding model with nearest-neighbor hopping on the diamond lattice, in analogy to the flat-band edge states in graphene with a zigzag edge. The bulk band is gapless, and the gap closes along a loop in the Brillouin zone. The verge... [Phys. Rev. B 88, 235303] Published Tue Dec 10, 2013

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Thermally excited multiband conduction in LaAlO_{3}/SrTiO_{3} heterostructures exhibiting magnetic scattering (2013)

V. K. Guduru, A. McCollam, A. Jost, S. Wenderich, H. Hilgenkamp, J. C. Maan, A. Brinkman, and U. Zeitler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-11

Beschreibung: Author(s): V. K. Guduru, A. McCollam, A. Jost, S. Wenderich, H. Hilgenkamp, J. C. Maan, A. Brinkman, and U. Zeitler Magnetotransport measurements of charge carriers at the interface of a LaAlO 3 /SrTiO 3 heterostructure with 26 unit cells of LaAlO 3 show Hall resistance and magnetoresistance which at low and high temperatures is described by a single channel of electronlike charge carriers. At intermediate temperatur... [Phys. Rev. B 88, 241301] Published Tue Dec 10, 2013

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Probing dynamics of Majorana fermions in quantum impurity systems (2013)

Christophe Mora and Karyn Le Hur

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-11

Beschreibung: Author(s): Christophe Mora and Karyn Le Hur We investigate the admittance of a metallic quantum RC circuit with a spinful single-channel lead or equally with two conducting spin-polarized channels, in which Majorana fermions play a crucial role in the charge dynamics. We address how the two-channel Kondo physics and its emergent Majoranas ari... [Phys. Rev. B 88, 241302] Published Tue Dec 10, 2013

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General theory of feedback control of a nuclear spin ensemble in quantum dots (2013)

Wen Yang and L. J. Sham

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-11

Beschreibung: Author(s): Wen Yang and L. J. Sham We present a microscopic theory of the nonequilibrium nuclear spin dynamics driven by the electron and/or hole under continuous-wave pumping in a quantum dot. We show the correlated dynamics of the nuclear spin ensemble and the electron and/or hole under optical excitation as a quantum feedback loop... [Phys. Rev. B 88, 235304] Published Tue Dec 10, 2013

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Heteroepitaxy and ferromagnetism of EuO/MgO (001): A route towards combined spin- and symmetry-filter tunneling (2013)

Christian Caspers, Andrei Gloskovskij, Wolfgang Drube, Claus M. Schneider, and Martina Müller

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-06

Beschreibung: Author(s): Christian Caspers, Andrei Gloskovskij, Wolfgang Drube, Claus M. Schneider, and Martina Müller We demonstrate the high-quality heteroepitaxy of ultrathin EuO films with bulklike ferromagnetism directly on MgO (001), an important step towards combining the spin-filter tunnel effect in magnetic insulators and symmetry-filter tunneling through single-crystalline MgO barriers. Despite a large com... [Phys. Rev. B 88, 245302] Published Thu Dec 05, 2013

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Continuous terahertz emission from dipolaritons (2013)

K. Kristinsson, O. Kyriienko, T. C. H. Liew, and I. A. Shelykh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-07

Beschreibung: Author(s): K. Kristinsson, O. Kyriienko, T. C. H. Liew, and I. A. Shelykh We propose a scheme of continuous tunable THz emission based on dipolaritons, mixtures of strongly interacting cavity photons and direct excitons, where the latter are coupled to indirect excitons via tunneling. We investigate the property of multistability under continuous wave (CW) pumping, and th... [Phys. Rev. B 88, 245303] Published Fri Dec 06, 2013

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Blueshift of the A-exciton peak in folded monolayer 1H-MoS_{2} (2013)

Frank J. Crowne, Matin Amani, A. Glen Birdwell, Matthew L. Chin, Terrance P. O’Regan, Sina Najmaei, Zheng Liu, Pulickel M. Ajayan, Jun Lou, and Madan Dubey

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-07

Beschreibung: Author(s): Frank J. Crowne, Matin Amani, A. Glen Birdwell, Matthew L. Chin, Terrance P. O’Regan, Sina Najmaei, Zheng Liu, Pulickel M. Ajayan, Jun Lou, and Madan Dubey The large family of layered transition-metal dichalcogenides is widely believed to constitute a second family of two-dimensional (2D) semiconducting materials that can be used to create novel devices that complement those based on graphene. In many cases these materials have shown a transition from ... [Phys. Rev. B 88, 235302] Published Fri Dec 06, 2013

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

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Comparative study of intersubband absorption in AlGaN/GaN and AlInN/GaN superlattices: Impact of material inhomogeneities (2013)

C. Edmunds, L. Tang, M. Cervantes, M. Shirazi-HD, J. Shao, A. Grier, A. Valavanis, J. D. Cooper, D. Li, G. Gardner, D. N. Zakharov, Z. Ikonić, D. Indjin, P. Harrison, M. J. Manfra, and O. Malis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-11

Beschreibung: Author(s): C. Edmunds, L. Tang, M. Cervantes, M. Shirazi-HD, J. Shao, A. Grier, A. Valavanis, J. D. Cooper, D. Li, G. Gardner, D. N. Zakharov, Z. Ikonić, D. Indjin, P. Harrison, M. J. Manfra, and O. Malis We report a systematic and quantitative study of near-infrared intersubband absorption in strained AlGaN/GaN and lattice-matched AlInN/GaN superlattices grown by plasma-assisted molecular-beam epitaxy as a function of Si-doping profile with and without δ doping. For AlGaN/GaN, we obtained good theor... [Phys. Rev. B 88, 235306] Published Tue Dec 10, 2013

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

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Spin-orbit effects in a triple quantum dot shuttle (2013)

J. Villavicencio, I. Maldonado, E. Cota, and G. Platero

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-11

Beschreibung: Author(s): J. Villavicencio, I. Maldonado, E. Cota, and G. Platero Spin transport properties of a triple quantum dot shuttle system are analyzed in the presence of spin-orbit interaction. We calculate the spin current through the device as a function of the bias voltage detuning. We find that new resonances in the current through the shuttle appear due to the prese... [Phys. Rev. B 88, 245305] Published Tue Dec 10, 2013

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

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Two types of surface states in topological crystalline insulators (2013)

Junwei Liu, Wenhui Duan, and Liang Fu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-12-12

Beschreibung: Author(s): Junwei Liu, Wenhui Duan, and Liang Fu Topological crystalline insulators (TCIs) are new states of matter whose topological distinction relies on the crystal symmetry of periodic solids. The first material realization of TCIs has recently been predicted and observed in IV-VI semiconductor SnTe and related alloys. By combining k · p theory ... [Phys. Rev. B 88, 241303] Published Wed Dec 11, 2013

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

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Mechanism for controlling the exciton fine structure in quantum dots using electric fields: Manipulation of exciton orientation and exchange splitting at the atomic scale (2013)

Garnett W. Bryant, Natalia Malkova, and James Sims

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-08

Beschreibung: Author(s): Garnett W. Bryant, Natalia Malkova, and James Sims Using atomistic tight-binding theory with a configuration interaction description of Coulomb and exchange effects, we describe excitons in symmetric quantum dots in a vertical electric field to explain how field-induced manipulation of exciton orientation and phase can eliminate the anisotropic exch... [Phys. Rev. B 88, 161301] Published Mon Oct 07, 2013

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

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Spin dynamics in p-doped semiconductor nanostructures subject to a magnetic field tilted from the Voigt geometry (2013)

K. Korzekwa, C. Gradl, M. Kugler, S. Furthmeier, M. Griesbeck, M. Hirmer, D. Schuh, W. Wegscheider, T. Kuhn, C. Schüller, T. Korn, and P. Machnikowski

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-09

Beschreibung: Author(s): K. Korzekwa, C. Gradl, M. Kugler, S. Furthmeier, M. Griesbeck, M. Hirmer, D. Schuh, W. Wegscheider, T. Kuhn, C. Schüller, T. Korn, and P. Machnikowski We develop a theoretical description of the spin dynamics of resident holes in a p -doped semiconductor quantum well (QW) subject to a magnetic field slightly tilted from the Voigt geometry. We find the expressions for the signals measured in time-resolved Faraday rotation (TRFR) and resonant spin am... [Phys. Rev. B 88, 155303] Published Tue Oct 08, 2013

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

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Disruption of superlattice phonons by interfacial mixing (2013)

Samuel C. Huberman, Jason M. Larkin, Alan J. H. McGaughey, and Cristina H. Amon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-12

Beschreibung: Author(s): Samuel C. Huberman, Jason M. Larkin, Alan J. H. McGaughey, and Cristina H. Amon Molecular dynamics simulations and lattice dynamics calculations are used to study the vibrational modes and thermal transport in Lennard-Jones superlattices with perfect and mixed interfaces. The secondary periodicity of the superlattices leads to a vibrational spectrum (i.e., dispersion relation) ... [Phys. Rev. B 88, 155311] Published Fri Oct 11, 2013

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

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Independent control of exciton and biexciton energies in single quantum dots via electroelastic fields (2013)

Rinaldo Trotta, Eugenio Zallo, Elisabeth Magerl, Oliver G. Schmidt, and Armando Rastelli

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-16

Beschreibung: Author(s): Rinaldo Trotta, Eugenio Zallo, Elisabeth Magerl, Oliver G. Schmidt, and Armando Rastelli We investigate the effect of large in-plane strain and vertical electric fields on the binding energies of excitonic complexes confined in single InGaAs/GaAs quantum dots (QDs) and we find that the two independently tunable perturbations modify the interaction energies among electrons and holes in a... [Phys. Rev. B 88, 155312] Published Tue Oct 15, 2013

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

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Simulations of imaging of the local density of states by a charged probe technique for resonant cavities (2013)

K. Kolasiński and B. Szafran

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-16

Beschreibung: Author(s): K. Kolasiński and B. Szafran We simulate scanning probe imaging of the local density of states related to scattering Fermi level wave functions inside a resonant cavity. We calculate the potential landscape within the cavity, taking into account the Coulomb charge of the probe and its screening by deformation of the two-dimensi... [Phys. Rev. B 88, 165306] Published Tue Oct 15, 2013

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

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Carrier dynamics in Si nanocrystals in an SiO_{2} matrix investigated by transient light absorption (2013)

W. D. A. M. de Boer, E. M. L. D. de Jong, D. Timmerman, T. Gregorkiewicz, H. Zhang, W. J. Buma, A. N. Poddubny, A. A. Prokofiev, and I. N. Yassievich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-09

Beschreibung: Author(s): W. D. A. M. de Boer, E. M. L. D. de Jong, D. Timmerman, T. Gregorkiewicz, H. Zhang, W. J. Buma, A. N. Poddubny, A. A. Prokofiev, and I. N. Yassievich We report on investigations of optical carrier generation in silicon nanocrystals embedded in an SiO 2 matrix. Carrier relaxation and recombination processes are monitored by means of time-resolved induced absorption, using a conventional femtosecond pump-probe setup for samples containing different ... [Phys. Rev. B 88, 155304] Published Tue Oct 08, 2013

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