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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

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

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

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

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

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

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

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

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

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

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

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

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

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

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Phase and amplitude of Aharonov-Bohm oscillations in nonlinear three-terminal transport through a double quantum dot (2011)

Toshihiro Kubo, Yuki Ichigo, and Yasuhiro Tokura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-08

Beschreibung: Author(s): Toshihiro Kubo, Yuki Ichigo, and Yasuhiro Tokura We study three-terminal linear and nonlinear transport through an Aharonov-Bohm interferometer containing a double quantum dot using the nonequilibrium Green function method. Under the condition that one of the three terminals is a voltage probe, we show that the linear conductance is symmetric with... [Phys. Rev. B 83, 235310] Published Tue Jun 07, 2011

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First-principles electronic structure and relative stability of pyrite and marcasite: Implications for photovoltaic performance (2011)

Ruoshi Sun, M. K. Y. Chan, and G. Ceder

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-09

Beschreibung: Author(s): Ruoshi Sun, M. K. Y. Chan, and G. Ceder Despite the many advantages (e.g., suitable band gap, exceptional optical absorptivity, earth abundance) of pyrite as a photovoltaic material, its low open-circuit voltage (OCV) has remained the biggest challenge preventing its use in practical devices. Two of the most widely accepted reasons for th... [Phys. Rev. B 83, 235311] Published Wed Jun 08, 2011

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Full counting statistics for SU(N) impurity Anderson model (2011)

Rui Sakano, Akira Oguri, Takeo Kato, and Seigo Tarucha

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-09

Beschreibung: Author(s): Rui Sakano, Akira Oguri, Takeo Kato, and Seigo Tarucha We analyze the full counting statistics of the multiorbital Kondo effect in a quantum dot with SU( N ) symmetry in the framework of renormalized perturbation theory. The current probability distribution function is calculated for an arbitrary dot-site Coulomb repulsion U in the particle-hole-symmetric... [Phys. Rev. B 83, 241301] Published Wed Jun 08, 2011

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Nuclear spin pumping and electron spin susceptibilities (2011)

J. Danon and Yu. V. Nazarov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): J. Danon and Yu. V. Nazarov In this work we present a new formalism to evaluate the nuclear spin dynamics driven by hyperfine interaction with nonequilibrium electron spins. To describe the dynamics up to second order in the hyperfine coupling it suffices to evaluate the susceptibility and fluctuations of the electron spin. Ou... [Phys. Rev. B 83, 245306] Published Fri Jun 10, 2011

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Detection of stacking faults breaking the [110]/[11[over ¯]0] symmetry in ferromagnetic semiconductors (Ga,Mn)As and (Ga,Mn)(As,P) (2011)

M. Kopecký, J. Kub, F. Máca, J. Mašek, O. Pacherová, A. W. Rushforth, B. L. Gallagher, R. P. Campion, V. Novák, and T. Jungwirth

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): M. Kopecký, J. Kub, F. Máca, J. Mašek, O. Pacherová, A. W. Rushforth, B. L. Gallagher, R. P. Campion, V. Novák, and T. Jungwirth We report on high-resolution x-ray diffraction measurements of (Ga,Mn)As and (Ga,Mn)(As,P) epilayers. We observe a structural anisotropy in the form of stacking faults that are present in the (111) and (11 1̅ ) planes and absent in the ( 1̅ 11) and (1 1̅ 1) planes. They occupy 10 -2 ... [Phys. Rev. B 83, 235324] Published Tue Jun 14, 2011

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Tunable surface conductivity in Bi_{2}Se_{3} revealed in diffusive electron transport (2011)

J. Chen, X. Y. He, K. H. Wu, Z. Q. Ji, L. Lu, J. R. Shi, J. H. Smet, and Y. Q. Li

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): J. Chen, X. Y. He, K. H. Wu, Z. Q. Ji, L. Lu, J. R. Shi, J. H. Smet, and Y. Q. Li We demonstrate that the weak antilocalization effect can serve as a convenient method for detecting decoupled surface transport in topological insulator thin films. In the regime where a bulk Fermi surface coexists with the surface states, the low-field magnetoconductivity is well described by the H... [Phys. Rev. B 83, 241304] Published Tue Jun 14, 2011

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Thermal conductance of a two-channel Kondo model (2011)

C. P. Moca, A. Roman, and D. C. Marinescu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): C. P. Moca, A. Roman, and D. C. Marinescu A theory of thermal transport in a two-channel Kondo system, such as the one formed by a small quantum dot coupled to two leads and to a larger dot, is formulated. The interplay of the two screening constants allow an exploration of the Fermi liquid and non-Fermi liquid regimes. By using analytical,... [Phys. Rev. B 83, 245308] Published Mon Jun 20, 2011

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X-ray diffraction profiles from axial nanowire heterostructures (2011)

V. M. Kaganer, M. Wölz, O. Brandt, L. Geelhaar, and H. Riechert

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): V. M. Kaganer, M. Wölz, O. Brandt, L. Geelhaar, and H. Riechert X-ray diffraction peaks from nanowires with quantum disks inserted to form axial heterostructures are studied theoretically and experimentally. The peak profiles are calculated taking into account partial coherence of the x-ray beam, the orientational distribution of nanowires, their length distribu... [Phys. Rev. B 83, 245321] Published Tue Jun 28, 2011

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Very fast light-induced degradation of a-Si:H/c-Si(100) interfaces (2011)

Stefaan De Wolf, Bénédicte Demaurex, Antoine Descoeudres, and Christophe Ballif

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-08

Beschreibung: Author(s): Stefaan De Wolf, Bénédicte Demaurex, Antoine Descoeudres, and Christophe Ballif Light-induced degradation (LID) of crystalline silicon ( c -Si) surfaces passivated with hydrogenated amorphous silicon ( a -Si:H) is investigated. The initial passivation decays on polished c -Si(100) surfaces on a time scale much faster than usually associated with bulk a -Si:H LID. This phenomenon is a... [Phys. Rev. B 83, 233301] Published Tue Jun 07, 2011

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Two exact properties of the perturbative expansion for the two-dimensional electron liquid with Rashba or Dresselhaus spin-orbit coupling (2011)

Stefano Chesi and Gabriele F. Giuliani

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-08

Beschreibung: Author(s): Stefano Chesi and Gabriele F. Giuliani We have identified two useful exact properties of the perturbative expansion for the case of a two-dimensional electron liquid with Rashba or Dresselhaus spin-orbit interaction and in the absence of magnetic field. The results allow us to draw interesting conclusions regarding the dependence of the ... [Phys. Rev. B 83, 235308] Published Tue Jun 07, 2011

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Structural and electronic properties of silver/silicon interfaces and implications for solar cell performance (2011)

Keith T. Butler, Per Erik Vullum, Astrid Marie Muggerud, Enrique Cabrera, and John H. Harding

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-08

Beschreibung: Author(s): Keith T. Butler, Per Erik Vullum, Astrid Marie Muggerud, Enrique Cabrera, and John H. Harding We present the results of an experimental and atomistic modeling investigation of the silicon/silver (Si/Ag) interfaces found in industrial solar cells. We use small ab initio calculations to parametrize a new interatomic potential for the Si/Ag interaction. This interatomic potential is then valida... [Phys. Rev. B 83, 235307] Published Tue Jun 07, 2011

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High-density limit of the two-dimensional electron liquid with Rashba spin-orbit coupling (2011)

Stefano Chesi and Gabriele F. Giuliani

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-08

Beschreibung: Author(s): Stefano Chesi and Gabriele F. Giuliani We discuss by analytic means the theory of the high-density limit of the unpolarized two-dimensional electron liquid in the presence of Rashba or Dresselhaus spin-orbit coupling. A generalization of the ring-diagram expansion is performed. We find that in this regime the spin-orbit coupling leads to... [Phys. Rev. B 83, 235309] Published Tue Jun 07, 2011

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Temperature dependence of the photoluminescence spectra from InAs(P)/InP multilayers containing thick quantum dots: Dot-size-dependent carrier dynamics (2011)

A. Lévesque, P. Desjardins, R. Leonelli, and R. A. Masut

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-07

Beschreibung: Author(s): A. Lévesque, P. Desjardins, R. Leonelli, and R. A. Masut We have studied the temperature dependence (∼10–293 K) of the photoluminescence (PL) from InAs/InP(001) quantum dot (QD) multilayers with thin spacer layers (∼5 nm) emitting in the 0.6–0.8 eV spectral region. The QD emission redshifts less than the InAs bulk material band gap with increasing tempera... [Phys. Rev. B 83, 235304] Published Mon Jun 06, 2011

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Picosecond strain pulses probed by the photocurrent in semiconductor devices with quantum wells (2011)

D. Moss, A. V. Akimov, R. P. Campion, M. Henini, C. T. Foxon, L. Eaves, A. J. Kent, and B. A. Glavin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-07

Beschreibung: Author(s): D. Moss, A. V. Akimov, R. P. Campion, M. Henini, C. T. Foxon, L. Eaves, A. J. Kent, and B. A. Glavin Ultrafast acoustic wave packets are detected by probing the photocurrent in semiconductor devices containing quantum wells. The strain pulses were generated by thermalization of a femtosecond laser pulse in a thin metal film deposited on the surface of the GaAs substrate opposite to the semiconducto... [Phys. Rev. B 83, 245303] Published Mon Jun 06, 2011

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Hubbard model description of silicon spin qubits: Charge stability diagram and tunnel coupling in Si double quantum dots (2011)

S. Das Sarma, Xin Wang, and Shuo Yang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): S. Das Sarma, Xin Wang, and Shuo Yang We apply the recently introduced Hubbard model approach to quantitatively describe the experimental charge stability diagram and tunnel coupling of silicon double quantum dot systems. The results calculated from both the generalized Hubbard model and the microscopic theory are compared with existing... [Phys. Rev. B 83, 235314] Published Fri Jun 10, 2011

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Microscopic origins of the surface exciton photoluminescence peak in ZnO nanostructures (2011)

Mahua Biswas, Yun Suk Jung, Hong Koo Kim, Kumarappan Kumar, Gregory J. Hughes, S. Newcomb, Martin O. Henry, and Enda McGlynn

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-14

Beschreibung: Author(s): Mahua Biswas, Yun Suk Jung, Hong Koo Kim, Kumarappan Kumar, Gregory J. Hughes, S. Newcomb, Martin O. Henry, and Enda McGlynn We report photoluminescence (PL) studies of the surface exciton peak in ZnO nanostructures at ~3.367 eV aimed at elucidation of the nature and origin of the emission and its relationship to the nanostructure morphology. PL spectra in conjunction with localized voltage application in high vacuum and ... [Phys. Rev. B 83, 235320] Published Mon Jun 13, 2011

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Stability of the Bi_{2}Se_{3}(111) topological state: Electron-phonon and electron-defect scattering (2011)

Richard C. Hatch, Marco Bianchi, Dandan Guan, Shining Bao, Jianli Mi, Bo Brummerstedt Iversen, Louis Nilsson, Liv Hornekær, and Philip Hofmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): Richard C. Hatch, Marco Bianchi, Dandan Guan, Shining Bao, Jianli Mi, Bo Brummerstedt Iversen, Louis Nilsson, Liv Hornekær, and Philip Hofmann The electron dynamics of the topological surface state on Bi 2 Se 3 (111) is investigated by temperature-dependent angle-resolved photoemission. The electron-phonon coupling strength is determined in a spectral region for which only intraband scattering involving the topological surface band is possible... [Phys. Rev. B 83, 241303] Published Tue Jun 14, 2011

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Formation of bound states in the continuum for a quantum dot with variable width (2011)

Evgeny Bulgakov and Almas Sadreev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): Evgeny Bulgakov and Almas Sadreev We consider mechanisms of formation of the bound states in the continuum in open rectangular quantum dots with variable width. Because of symmetry there might be bound states in the continuum (BSCs) embedded into one, two, and three continua because of the symmetry of system. These BSCs arise for se... [Phys. Rev. B 83, 235321] Published Tue Jun 14, 2011

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Coherent properties of nanoelectromechanical systems (2011)

G. Piovano, F. Cavaliere, E. Paladino, and M. Sassetti

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-23

Beschreibung: Author(s): G. Piovano, F. Cavaliere, E. Paladino, and M. Sassetti We study the properties of a nanoelectromechanical system in the coherent regime, where the electronic and vibrational time scales are of the same order. By employing a master-equation approach, we obtain the stationary reduced density matrix retaining the coherences between vibrational states. Depe... [Phys. Rev. B 83, 245311] Published Wed Jun 22, 2011

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Anomalous spectral scaling of light emission rates in low-dimensional metallic nanostructures (2011)

D. A. Genov, R. F. Oulton, G. Bartal, and X. Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): D. A. Genov, R. F. Oulton, G. Bartal, and X. Zhang The strength of light emission near metallic nanostructures can scale anomalously with frequency and dimensionality. We find that light-matter interactions in plasmonic systems confined in two dimensions (e.g., near metal nanowires) strengthen with decreasing frequency owing to strong mode confineme... [Phys. Rev. B 83, 245312] Published Fri Jun 24, 2011

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Density functional theory study of TiO_{2}/Ag interfaces and their role in memristor devices (2011)

Stefano Prada, Massimo Rosa, Livia Giordano, Cristiana Di Valentin, and Gianfranco Pacchioni

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): Stefano Prada, Massimo Rosa, Livia Giordano, Cristiana Di Valentin, and Gianfranco Pacchioni The nature of Ag(111)/TiO 2 rutile and anatase interfaces, of interest for the design of memristors, has been studied by means of density functional theory calculations using various computational approaches. We have considered interfaces where the lattice mismatch of the oxide crystalline phase and ... [Phys. Rev. B 83, 245314] Published Fri Jun 24, 2011

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Saturation of front propagation in a reaction diffusion process describing plasma damage in porous low-k materials (2011)

Soghra Safaverdi, Gerard T. Barkema, Eddy Kunnen, Adam M. Urbanowicz, and Christian Maes

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): Soghra Safaverdi, Gerard T. Barkema, Eddy Kunnen, Adam M. Urbanowicz, and Christian Maes We propose a three-component reaction-diffusion system yielding an asymptotic logarithmic time dependence for a moving interface. This is naturally related to a Stefan problem for which both one-sided Dirichlet-type and von Neumann-type boundary conditions are considered. We integrate the dependence... [Phys. Rev. B 83, 245320] Published Tue Jun 28, 2011

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Surface core-level shifts on Ge(111)c(2×8): Experiment and theory (2011)

M. Kuzmin, M. J. P. Punkkinen, P. Laukkanen, J. J. K. Lång, J. Dahl, V. Tuominen, M. Tuominen, R. E. Perälä, T. Balasubramanian, J. Adell, B. Johansson, L. Vitos, K. Kokko, and I. J. Väyrynen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-29

Beschreibung: Author(s): M. Kuzmin, M. J. P. Punkkinen, P. Laukkanen, J. J. K. Lång, J. Dahl, V. Tuominen, M. Tuominen, R. E. Perälä, T. Balasubramanian, J. Adell, B. Johansson, L. Vitos, K. Kokko, and I. J. Väyrynen Combining high-resolution photoelectron spectroscopy and density functional theory (DFT) calculations, 3 d photoemission line shape and surface core-level shifts have been reinvestigated on the Ge(111) c (2 × 8) surface. It is found that 3 d spectra include, in addition to the bulk and three surface-shi... [Phys. Rev. B 83, 245319] Published Tue Jun 28, 2011

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Strain-induced darkening of trapped excitons in coupled quantum wells at low temperature (2011)

N. W. Sinclair, J. K. Wuenschell, Z. Vörös, B. Nelsen, D. W. Snoke, M. H. Szymanska, A. Chin, J. Keeling, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-10

Beschreibung: Author(s): N. W. Sinclair, J. K. Wuenschell, Z. Vörös, B. Nelsen, D. W. Snoke, M. H. Szymanska, A. Chin, J. Keeling, L. N. Pfeiffer, and K. W. West In GaAs/AlGaAs coupled quantum wells, strain-induced traps may be used to confine excitons in in-plane, harmonic traps. Using these traps, we have pursued Bose-Einstein condensation (BEC) of long-lived, spatially indirect excitons. Here, we report a remarkable transition of the indirect exciton lumi... [Phys. Rev. B 83, 245304] Published Thu Jun 09, 2011

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Static conductivity of charged domain walls in uniaxial ferroelectric semiconductors (2011)

E. A. Eliseev, A. N. Morozovska, G. S. Svechnikov, Venkatraman Gopalan, and V. Ya. Shur

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-10

Beschreibung: Author(s): E. A. Eliseev, A. N. Morozovska, G. S. Svechnikov, Venkatraman Gopalan, and V. Ya. Shur By using Landau-Ginzburg-Devonshire theory, we numerically calculated the static conductivity of charged domain walls with different incline angles with respect to the spontaneous polarization vector in the uniaxial ferroelectric semiconductors of n type. We used the effective mass approximation for... [Phys. Rev. B 83, 235313] Published Thu Jun 09, 2011

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Stability of boron nitride bilayers: Ground-state energies, interlayer distances, and tight-binding description (2011)

R. M. Ribeiro and N. M. R. Peres

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-10

Beschreibung: Author(s): R. M. Ribeiro and N. M. R. Peres We have studied boron nitride monolayer and bilayer band structures. For bilayers, the ground-state energies of the different five stackings are computed using DFT in order to determine the most stable configuration. Also, the interlayer distance for the five different types of stacking in which bor... [Phys. Rev. B 83, 235312] Published Thu Jun 09, 2011

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Phenomenological study of decoherence in solid-state spin qubits due to nuclear spin diffusion (2011)

Michael J. Biercuk and Hendrik Bluhm

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Michael J. Biercuk and Hendrik Bluhm We present a study of the prospects for coherence preservation in solid-state spin qubits using dynamical decoupling protocols. Recent experiments have provided the first demonstrations of multipulse dynamical decoupling sequences in this qubit system, but quantitative analyses of potential coherenc... [Phys. Rev. B 83, 235316] Published Fri Jun 10, 2011

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Acoustic studies of ac conductivity mechanisms in n-GaAs/Al_{x}Ga_{1-x}As in the integer and fractional quantum Hall effect regime (2011)

I. L. Drichko, I. Yu. Smirnov, A. V. Suslov, and D. R. Leadley

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): I. L. Drichko, I. Yu. Smirnov, A. V. Suslov, and D. R. Leadley For the heterostructure n -GaAs/Al x Ga 1- x As with a sheet density n =2×10 11 cm -2 and mobility μ ≈2×10 6 cm 2 /V s with integer and fractional quantum Hall effects (IQHE and FQHE, respectively) we demonstrate the wide applicability of acoustic methods for determining the general conduction parameters of a two... [Phys. Rev. B 83, 235318] Published Fri Jun 10, 2011

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Phonon-mediated decoherence in triple quantum dot interferometers (2011)

Fernando Domínguez, Sigmund Kohler, and Gloria Platero

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): Fernando Domínguez, Sigmund Kohler, and Gloria Platero We investigate decoherence in a triple quantum dot in a ring configuration, in which one dot is coupled to a damped phonon mode while the other two dots are connected to a source and a drain, respectively. In the absence of decoherence, single-electron transport may get blocked by an electron fallin... [Phys. Rev. B 83, 235319] Published Fri Jun 10, 2011

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From irrational to nonunitary: Haffnian and Haldane-Rezayi wave functions (2011)

M. Hermanns, N. Regnault, B. A. Bernevig, and E. Ardonne

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): M. Hermanns, N. Regnault, B. A. Bernevig, and E. Ardonne We study the Haffnian and Haldane-Rezayi quantum Hall wave functions and their quasihole excitations by means of their “root configurations,” and point out a close connection between these seemingly different states. For both states, we formulate a “generalized Pauli-principle,” which makes it possi... [Phys. Rev. B 83, 241302] Published Fri Jun 10, 2011

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Effects of confinement and orientation on the thermoelectric power factor of silicon nanowires (2011)

Neophytos Neophytou and Hans Kosina

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): Neophytos Neophytou and Hans Kosina It is suggested that low dimensionality can improve the thermoelectric (TE) power factor of a device, offering an enhancement of the ZT figure of merit. In this paper, the atomistic sp 3 d 5 s * -spin-orbit-coupled tight-binding model and the linearized Boltzmann transport theory is applied to calculate t... [Phys. Rev. B 83, 245305] Published Fri Jun 10, 2011

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Theory of excitons in cubic III-V semiconductor GaAs, InAs and GaN quantum dots: Fine structure and spin relaxation (2011)

H. Tong and M. W. Wu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): H. Tong and M. W. Wu Exciton fine structures in cubic III-V semiconductor GaAs, InAs and GaN quantum dots are investigated systematically and the exciton spin relaxation in GaN quantum dots is calculated by first setting up the effective exciton Hamiltonian. The electron-hole exchange interaction Hamiltonian, which cons... [Phys. Rev. B 83, 235323] Published Tue Jun 14, 2011

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Impurity effects on semiconductor quantum bits in coupled quantum dots (2011)

Nga T. T. Nguyen and S. Das Sarma

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-15

Beschreibung: Author(s): Nga T. T. Nguyen and S. Das Sarma We theoretically consider the effects of having unintentional charged impurities in laterally coupled two-dimensional double (GaAs) quantum-dot systems, where each dot contains one or two electrons and a single charged impurity. Using molecular orbital and configuration interaction methods, we calcu... [Phys. Rev. B 83, 235322] Published Tue Jun 14, 2011

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Spatial mapping and manipulation of two tunnel-coupled quantum dots (2011)

Magdalena Huefner, Bruno Kueng, Stephan Schnez, Klaus Ensslin, Thomas Ihn, Matthias Reinwald, and Werner Wegscheider

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): Magdalena Huefner, Bruno Kueng, Stephan Schnez, Klaus Ensslin, Thomas Ihn, Matthias Reinwald, and Werner Wegscheider The metallic tip of a scanning force microscope operated at 300mK is used to locally induce a potential in a fully controllable double quantum dot defined via local anodic oxidation in a GaAs/AlGaAs heterostructure. Using scanning gate techniques we record spatial images of the current through the s... [Phys. Rev. B 83, 235326] Published Wed Jun 15, 2011

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Mn incorporation into the GaAs lattice investigated by hard x-ray photoelectron spectroscopy and diffraction (2011)

I. Bartoš, I. Píš, M. Kobata, K. Kobayashi, M. Cukr, P. Jiřiček, T. Sugiyama, and E. Ikenaga

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): I. Bartoš, I. Píš, M. Kobata, K. Kobayashi, M. Cukr, P. Jiřiček, T. Sugiyama, and E. Ikenaga Photoelectron spectroscopy and diffraction have been used to investigate structural changes during the annealing process of Ga 1- x Mn x As samples. Hard x-ray radiation helped in observing photoelectron core-level spectra and electron diffraction from the bulk underlying the oxidized surface layer. High... [Phys. Rev. B 83, 235327] Published Wed Jun 15, 2011

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Cavity polaritons of heavy-hole and light-hole excitons in a CuI microcavity (2011)

M. Nakayama, M. Kameda, T. Kawase, and D. Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): M. Nakayama, M. Kameda, T. Kawase, and D. Kim We have investigated the exciton-photon coupling phenomena in a CuI bulk microcavity consisting of a CuI active layer with an effective thickness of λ /2 and HfO 2 / SiO 2 distributed Bragg reflectors. In the CuI active layer, a thermal strain removes the degeneracy of the heavy-hole (HH) and light-hole ... [Phys. Rev. B 83, 235325] Published Wed Jun 15, 2011

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Simulations of friction force microscopy on the KBr(001) surface based on ab initio calculated tip-sample forces (2011)

Christine Wieferink, Peter Krüger, and Johannes Pollmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-16

Beschreibung: Author(s): Christine Wieferink, Peter Krüger, and Johannes Pollmann We report on ab initio -based simulations of friction-force microscopy on the KBr(001) surface at zero and nonzero temperature. To simulate sliding friction, we employ an extended three-dimensional (3D) Prandtl-Tomlinson model. The microscopic part of the tip is modeled by K + - or Br - -terminated tips.... [Phys. Rev. B 83, 235328] Published Wed Jun 15, 2011

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Scattering mechanisms in a high-mobility low-density carbon-doped (100) GaAs two-dimensional hole system (2011)

J. D. Watson, S. Mondal, G. A. Csáthy, M. J. Manfra, E. H. Hwang, S. Das Sarma, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): J. D. Watson, S. Mondal, G. A. Csáthy, M. J. Manfra, E. H. Hwang, S. Das Sarma, L. N. Pfeiffer, and K. W. West We report on a systematic study of the density dependence of mobility in a low-density carbon-doped (100) GaAs two-dimensional hole system (2DHS). At T =50 mK, a mobility of 2.6 × 10 6 cm 2 /Vs at a density p =6.2×10 10 cm -2 was measured. This is the highest mobility reported for a 2DHS to date. Using a b... [Phys. Rev. B 83, 241305] Published Mon Jun 20, 2011

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Optical evidence for intermolecular coupling in mixed films of pentacene and perfluoropentacene (2011)

K. Broch, U. Heinemeyer, A. Hinderhofer, F. Anger, R. Scholz, A. Gerlach, and F. Schreiber

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): K. Broch, U. Heinemeyer, A. Hinderhofer, F. Anger, R. Scholz, A. Gerlach, and F. Schreiber We present optical absorption spectra of mixed films of pentacene (PEN) and perfluoropentacene (PFP) grown on SiO 2 . We investigated the influence of intermolecular coupling between PEN and PFP on the optical spectra by analyzing samples with five different mixing ratios of PFP:PEN with variable angl... [Phys. Rev. B 83, 245307] Published Mon Jun 20, 2011

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Three-dimensional view of the shape, size, and atomic composition of ordered nanostructures by Rutherford backscattering spectrometry (2011)

Z. Zolnai, N. Nagy, A. Deák, G. Battistig, and E. Kótai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): Z. Zolnai, N. Nagy, A. Deák, G. Battistig, and E. Kótai Conventional Rutherford backscattering spectrometry (RBS) in combination with Monte Carlo simulations performed on 3D model cells allow the self-consistent determination of the shape, size, and atomic composition of silica particles as model structures, on the submicron scale. Spherical and ellipsoi... [Phys. Rev. B 83, 233302] Published Mon Jun 20, 2011

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Ultrafast polariton relaxation dynamics in an organic semiconductor microcavity (2011)

T. Virgili, D. Coles, A. M. Adawi, C. Clark, P. Michetti, S. K. Rajendran, D. Brida, D. Polli, G. Cerullo, and D. G. Lidzey

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-21

Beschreibung: Author(s): T. Virgili, D. Coles, A. M. Adawi, C. Clark, P. Michetti, S. K. Rajendran, D. Brida, D. Polli, G. Cerullo, and D. G. Lidzey We study an organic semiconductor microcavity operating in the strong-coupling regime using fs pump-probe spectroscopy. By probing the induced absorption associated with the one-exciton to two-exciton transition, we are able to characterize the time-dependent population densities of states in the up... [Phys. Rev. B 83, 245309] Published Mon Jun 20, 2011

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Quantum transport in indium nitride nanowires (2011)

Liubing Huang, Dongdong Li, Paichun Chang, Sheng Chu, Hans Bozler, Igor S. Beloborodov, and Jia G. Lu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-22

Beschreibung: Author(s): Liubing Huang, Dongdong Li, Paichun Chang, Sheng Chu, Hans Bozler, Igor S. Beloborodov, and Jia G. Lu Transport measurements are performed under the variations of temperature and magnetic field on single crystalline InN nanowires. Conduction at low temperature reveals a three-dimensional Mott variable range hopping mechanism. With rising temperature, a semiconductor-to-metal transition is observed a... [Phys. Rev. B 83, 245310] Published Tue Jun 21, 2011

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Occupation of electron subbands in optically excited δ-acceptor-doped GaAs/Al_{x}Ga_{1-x}As heterostructure (2011)

J. Łusakowski, R. Buczko, K.-J. Friedland, and R. Hey

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): J. Łusakowski, R. Buczko, K.-J. Friedland, and R. Hey Photoluminescence (PL) measurements were carried out on a Be-acceptor δ -doped GaAs/Al 0.33 Ga 0.67 As heterostructure at 1.6 K at magnetic fields up to 5 T. The studied PL originated from the recombination of free electrons in a two-dimensional electron gas with holes captured on Be acceptors. The elect... [Phys. Rev. B 83, 245313] Published Fri Jun 24, 2011

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Tunable nonlocal coupling between Kondo impurities (2011)

D. Tutuc, B. Popescu, D. Schuh, W. Wegscheider, and R. J. Haug

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-28

Beschreibung: Author(s): D. Tutuc, B. Popescu, D. Schuh, W. Wegscheider, and R. J. Haug We study the tuning mechanisms of Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction between two lateral quantum dots in the Kondo regime. At zero magnetic field we observe the expected splitting of the Kondo resonance and estimate the nonlocal coupling strength as a function of the asymmetry... [Phys. Rev. B 83, 241308] Published Mon Jun 27, 2011

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Variational analysis of the Rashba splitting in III–V semiconductor inversion layers (2011)

M. A. Toloza Sandoval, A. Ferreira da Silva, E. A. de Andrada e Silva, and G. C. La Rocca

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): M. A. Toloza Sandoval, A. Ferreira da Silva, E. A. de Andrada e Silva, and G. C. La Rocca A spin-dependent variational theory is used to analyze the Rashba spin-orbit splitting in two-dimensional electron gases formed in III–V semiconductor inversion layers. The spin split conduction subbands in CdTe/InSb, insulator/InAs, InP/InGaAs, InAlAs/InGaAs, and AlGaAs/GaAs heterojunctions are cal... [Phys. Rev. B 83, 235315] Published Fri Jun 10, 2011

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

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Positively versus negatively charged excitons: A high magnetic field study of CdTe/Cd_{1-x}Mg_{x}Te quantum wells (2011)

G. Bartsch, M. Gerbracht, D. R. Yakovlev, J. H. Blokland, P. C. M. Christianen, E. A. Zhukov, A. B. Dzyubenko, G. Karczewski, T. Wojtowicz, J. Kossut, J. C. Maan, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-11

Beschreibung: Author(s): G. Bartsch, M. Gerbracht, D. R. Yakovlev, J. H. Blokland, P. C. M. Christianen, E. A. Zhukov, A. B. Dzyubenko, G. Karczewski, T. Wojtowicz, J. Kossut, J. C. Maan, and M. Bayer A magneto-optical study of the energy and spin structure of charged excitons in a 20-nm-thick CdTe/Cd 0.65 Mg 0.35 Te quantum well is performed in strong magnetic fields up to 51 T. The type of resident carriers (holes or electrons) in the quantum well is controlled optically by above-barrier illuminati... [Phys. Rev. B 83, 235317] Published Fri Jun 10, 2011

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

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93

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Plasmon mechanism of the trion emission band broadening in quantum wells (2011)

A. A. Klochikhin, V. P. Kochereshko, L. Besombes, G. Karczewski, T. Wojtowicz, and J. Kossut

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-17

Beschreibung: Author(s): A. A. Klochikhin, V. P. Kochereshko, L. Besombes, G. Karczewski, T. Wojtowicz, and J. Kossut The effects of charge-density fluctuations on negative trion states in a quantum well are considered for the case of intermediate doping by electrons at zero magnetic field. The quasi-two-dimensionality of the system and the trion-plasmon interaction are taken into account in the framework of the ra... [Phys. Rev. B 83, 235329] Published Thu Jun 16, 2011

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

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Spin dephasing and photoinduced spin diffusion in a high-mobility two-dimensional electron system embedded in a GaAs-(Al,Ga)As quantum well grown in the [110] direction (2011)

R. Völkl, M. Griesbeck, S. A. Tarasenko, D. Schuh, W. Wegscheider, C. Schüller, and T. Korn

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): R. Völkl, M. Griesbeck, S. A. Tarasenko, D. Schuh, W. Wegscheider, C. Schüller, and T. Korn We have studied spin dephasing and spin diffusion in a high-mobility two-dimensional electron system, embedded in a GaAs/AlGaAs quantum well grown in the [110] direction, by a two-beam Hanle experiment. For very low excitation density, we observe spin lifetimes of more than 16 ns, which rapidly decr... [Phys. Rev. B 83, 241306] Published Fri Jun 24, 2011

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95

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Spin-to-orbital angular momentum conversion in semiconductor microcavities (2011)

F. Manni, K. G. Lagoudakis, T. K. Paraïso, R. Cerna, Y. Léger, T. C. H. Liew, I. A. Shelykh, A. V. Kavokin, F. Morier-Genoud, and B. Deveaud-Plédran

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-25

Beschreibung: Author(s): F. Manni, K. G. Lagoudakis, T. K. Paraïso, R. Cerna, Y. Léger, T. C. H. Liew, I. A. Shelykh, A. V. Kavokin, F. Morier-Genoud, and B. Deveaud-Plédran We experimentally demonstrate a technique for the generation of optical beams carrying orbital angular momentum using a planar semiconductor microcavity. Despite being isotropic systems with no structural gyrotropy, semiconductor microcavities, because of the transverse-electric–transverse-magnetic ... [Phys. Rev. B 83, 241307] Published Fri Jun 24, 2011

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Polarized red and blue light emission from silicon-based nanostructures correlated with crystallographic axes (2011)

B. Goller and D. Kovalev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-28

Beschreibung: Author(s): B. Goller and D. Kovalev Energy-selective photoluminescence spectroscopy of porous silicon has been used to study the morphology of porous silicon layers prepared from (110) silicon wafers. We demonstrate that the electric field vector of the red emission band is aligned along the principal crystallographic axes of bulk sil... [Phys. Rev. B 83, 233303] Published Mon Jun 27, 2011

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Suppression of low-frequency noise in two-dimensional electron gas at degenerately doped Si:P δ layers (2011)

Saquib Shamim, Suddhasatta Mahapatra, Craig Polley, Michelle Y. Simmons, and Arindam Ghosh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-06-28

Beschreibung: Author(s): Saquib Shamim, Suddhasatta Mahapatra, Craig Polley, Michelle Y. Simmons, and Arindam Ghosh We report low-frequency 1/ f -noise measurements of degenerately doped Si:P δ layers at 4.2 K. The noise was found to be over six orders of magnitude lower than that of bulk Si:P systems in the metallic regime and is one of the lowest values reported for doped semiconductors. The noise was nearly inde... [Phys. Rev. B 83, 233304] Published Mon Jun 27, 2011

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

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Optimization of electron pumping by harmonic mixing (2011)

Niklas Rohling and Frank Grossmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-05-21

Beschreibung: Author(s): Niklas Rohling and Frank Grossmann For a symmetric bridge coupled to infinite leads, in the presence of a dipole-coupled external ac field with harmonic mixing, we solve the Schrödinger equation in the time domain using open boundary conditions as well as in the energy domain using Floquet scattering theory. As this potential breaks ... [Phys. Rev. B 83, 205310] Published Fri May 20, 2011

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Material configurations for n-type silicon-based terahertz quantum cascade lasers (2011)

A. Valavanis, T. V. Dinh, L. J. M. Lever, Z. Ikonić, and R. W. Kelsall

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-05-24

Beschreibung: Author(s): A. Valavanis, T. V. Dinh, L. J. M. Lever, Z. Ikonić, and R. W. Kelsall Silicon-based quantum cascade lasers (QCLs) offer the prospect of integrating coherent terahertz (THz) radiation sources with silicon microelectronics. Theoretical studies have proposed a variety of n -type SiGe-based heterostructures as design candidates; however, the optimal material configuration ... [Phys. Rev. B 83, 195321] Published Mon May 23, 2011

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Density functional theory study of dopants in polycrystalline TiO_{2} (2011)

Wolfgang Körner and Christian Elsässer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2011-05-25

Beschreibung: Author(s): Wolfgang Körner and Christian Elsässer We present a density functional theory (DFT) study of doped rutile and anatase TiO 2 in which we investigate the impact of grain boundaries on the physics of atomic defects. The main goal is to obtain information about the positions of the defect levels generated by an oxygen vacancy, a titanium inte... [Phys. Rev. B 83, 205315] Published Tue May 24, 2011

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