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Theoretical model obtained in momentum space for charge transport in a system consisting of noninteracting polarons (2012)

F. Marsusi and J. Sabbaghzadeh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-09

Description: Author(s): F. Marsusi and J. Sabbaghzadeh We have developed a theory of charge transport in a system of noninteracting polarons. The theory is conducted to a compact relation through a nonperturbative method based on electron-phonon Hamiltonian. The derived final result represents two different limits of band and phonon-assisted transport, ... [Phys. Rev. B 85, 115302] Published Thu Mar 08, 2012

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Radiative coupling and weak lasing of exciton-polariton condensates (2012)

I. L. Aleiner, B. L. Altshuler, and Y. G. Rubo

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-09

Description: Author(s): I. L. Aleiner, B. L. Altshuler, and Y. G. Rubo In spite of having finite lifetimes exciton-polaritons in microcavities are known to condense at strong enough pumping of the reservoir. We present an analytical theory of such Bose condensates on a set of localized one-particle states: condensation centers. To understand the physics of these arrays... [Phys. Rev. B 85, 121301] Published Thu Mar 08, 2012

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Decoherence and dynamical decoupling control of nitrogen vacancy center electron spins in nuclear spin baths (2012)

Nan Zhao, Sai-Wah Ho, and Ren-Bao Liu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-09

Description: Author(s): Nan Zhao, Sai-Wah Ho, and Ren-Bao Liu We theoretically study the decoherence and the dynamical decoupling control of nitrogen vacancy center electron spins in high-purity diamond, where the hyperfine interaction with 13 C nuclear spins is the dominating decoherence mechanism. The decoherence is formulated as the entanglement between the ... [Phys. Rev. B 85, 115303] Published Thu Mar 08, 2012

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Current-conserving Aharonov-Bohm interferometry with arbitrary spin interactions (2012)

Minchul Lee and Dimitrije Stepanenko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): Minchul Lee and Dimitrije Stepanenko We propose a general scattering-matrix formalism that guarantees the charge conservation at junctions between conducting arms with arbitrary spin interactions. By using our formalism, we find that the spin-flip scattering can happen even at nonmagnetic junctions if the spin eigenstates in arms are n... [Phys. Rev. B 85, 075316] Published Tue Feb 21, 2012

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Role of anisotropy in the Förster energy transfer from a semiconductor quantum well to an organic crystalline overlayer (2012)

S. Kawka and G. C. La Rocca

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): S. Kawka and G. C. La Rocca We consider the nonradiative resonant energy transfer from a two-dimensional Wannier exciton (donor) to a Frenkel exciton of a molecular crystal overlayer (acceptor). We characterize the effect of the optical anisotropy of the organic subsystem on this process. Using realistic values of material par... [Phys. Rev. B 85, 115305] Published Mon Mar 12, 2012

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Mechanism for p-type conduction in polycrystalline indium oxide films (2012)

Jolanta Stankiewicz, María Pilar Lozano, and Francisco Villuendas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): Jolanta Stankiewicz, María Pilar Lozano, and Francisco Villuendas We report results of ac impedance measurements which we have obtained from intrinsic indium oxide films under UV irradiation and in darkness. We find two distinct contributions to the ac conductivity. One of them is brought about by grain boundaries, and the other one by inversion layers, which are ... [Phys. Rev. B 85, 125306] Published Wed Mar 14, 2012

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Electronic bound states in the continuum above (Ga,In)(As,N)/(Al,Ga)As quantum wells (2012)

Asaf Albo, Dan Fekete, and Gad Bahir

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): Asaf Albo, Dan Fekete, and Gad Bahir Using intersubband photocurrent spectroscopy, we have demonstrated that a bound state in the continuum exists above (Ga,In)(As,N)/(Al,Ga)As quantum wells. The photocurrent spectrum and responsivity show that the excited-state energies lie far above the potential barrier of the quantum well, and the ... [Phys. Rev. B 85, 115307] Published Wed Mar 14, 2012

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Single-valley quantum Hall ferromagnet in a dilute Mg_{x}Zn_{1−x}O/ZnO strongly correlated two-dimensional electron system (2012)

Y. Kozuka, A. Tsukazaki, D. Maryenko, J. Falson, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, and M. Kawasaki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-05

Description: Author(s): Y. Kozuka, A. Tsukazaki, D. Maryenko, J. Falson, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, and M. Kawasaki We investigate the spin susceptibility ( g * m * ) of dilute two-dimensional (2D) electrons confined at the Mg x Zn 1− x O/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g * m * , dominated by the increase in the Landé g -factor. The g -factor enhancement leads to a ferromagnetic... [Phys. Rev. B 85, 075302] Published Fri Feb 03, 2012

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Resonant polaron-assisted tunneling of strongly interacting electrons through a single-level vibrating quantum dot (2012)

Gleb A. Skorobagatko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-11

Description: Author(s): Gleb A. Skorobagatko The problem of resonant transport of strongly interacting electrons through a one-dimensional single-level vibrating quantum dot is being considered. In this paper, we generalize the Komnik and Gogolin model [ Phys. Rev. Lett. 90 246403 (2003) ] for the single-electron transistor with g =1/2 Luttinge... [Phys. Rev. B 85, 075310] Published Fri Feb 10, 2012

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Identification of magnetic dopants on the surfaces of topological insulators: Experiment and theory for Fe on Bi_{2}Te_{3}(111) (2012)

D. West, Y. Y. Sun, S. B. Zhang, T. Zhang, Xucun Ma, P. Cheng, Y. Y. Zhang, X. Chen, J. F. Jia, and Q. K. Xue

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-15

Description: Author(s): D. West, Y. Y. Sun, S. B. Zhang, T. Zhang, Xucun Ma, P. Cheng, Y. Y. Zhang, X. Chen, J. F. Jia, and Q. K. Xue Magnetic impurities are crucial for probing spin-polarized topological surface states. Scanning tunneling microscopy (STM) studies of Fe on the Bi 2 Te 3 (111) surface are preformed and unveil distinct impurity structures of unknown origin which exhibit temperature-dependent characteristics. Using densi... [Phys. Rev. B 85, 081305] Published Tue Feb 14, 2012

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Gate bias polarity dependent H migration and O vacancy generation through Si=O–H complex formation in SiO_{2}/Si(100) (2012)

Koichi Kato

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-16

Description: Author(s): Koichi Kato We studied H-atom migration in SiO 2 /Si systems triggering O vacancy generation based on first-principles calculations. The migrating H atoms in SiO 2 have been found to be mostly negatively charged irrespective of the charge-state polarity in the systems because strong charge transfer from the Si to ... [Phys. Rev. B 85, 085307] Published Wed Feb 15, 2012

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First-principles study of intermixing and polarization at the DyScO_{3}/SrTiO_{3} interface (2012)

K. Rahmanizadeh, G. Bihlmayer, M. Luysberg, and S. Blügel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): K. Rahmanizadeh, G. Bihlmayer, M. Luysberg, and S. Blügel The polar-to-nonpolar interface of DyScO 3 and SrTiO 3 was studied using density functional theory. Due to the polar discontinuity arising from nominally charged DyO or ScO 2 layers, sharp interfaces induce a strong ferroelectriclike polarization in the SrTiO 3 , while in chemically mixed interfaces this... [Phys. Rev. B 85, 075314] Published Tue Feb 21, 2012

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Tunneling magnetic effect in heterostructures with paramagnetic impurities (2012)

I. V. Rozhansky, N. S. Averkiev, and E. Lähderanta

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): I. V. Rozhansky, N. S. Averkiev, and E. Lähderanta An effect of paramagnetic impurity located in a vicinity of a quantum well (QW) on spin polarization of the carriers in the QW is analyzed theoretically. Within the approach of Bardeen's tunneling Hamiltonian the problem is formulated in terms of the Anderson-Fano model of configuration interaction ... [Phys. Rev. B 85, 075315] Published Tue Feb 21, 2012

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Transforming Fabry-Pérot resonances into a Tamm mode (2012)

Maxim Durach and Anastasia Rusina

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: Author(s): Maxim Durach and Anastasia Rusina We propose an optical structure composed of two metal nanolayers enclosing a distributed Bragg reflector (DBR) mirror. The structure is an open photonic system whose bound modes are coupled to external radiation. We apply the special theoretical treatment based on inversion symmetry of the structure... [Phys. Rev. B 86, 235312] Published Fri Dec 21, 2012

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Spin-orbit force due to Rashba coupling at the spin resonance condition (2012)

W. Ungier, Z. Wilamowski, and W. Jantsch

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: Author(s): W. Ungier, Z. Wilamowski, and W. Jantsch We analyze the effect of Rashba type of spin-orbit (SO) coupling on the electron dynamics and the rf electrical conductivity. We show that in addition to the momentum current an additional SO current occurs which can be attributed to a SO contribution to the electric Lorentz force. This Rashba SO fo... [Phys. Rev. B 86, 245318] Published Fri Dec 21, 2012

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Atomistic simulation of doping effects on growth and charge transport in Si/Ag interfaces in high-performance solar cells (2012)

Keith T. Butler and John H. Harding

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: Author(s): Keith T. Butler and John H. Harding We present the results of a first-principles atomistic simulation study of the effects of phosphorus doping on the silver/silicon interface as found in high-performance solar cells. Calculating the interfacial stabilities of the (110)/(110) and (111)/(111) interfaces we demonstrate how the presence ... [Phys. Rev. B 86, 245319] Published Fri Dec 21, 2012

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Transmission line theory of collective plasma excitations in periodic two-dimensional electron systems: Finite plasmonic crystals and Tamm states (2012)

Gregory R. Aizin and Gregory C. Dyer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Gregory R. Aizin and Gregory C. Dyer We present a comprehensive theory of the one-dimensional plasmonic crystal formed in the grating-gated two-dimensional electron gas (2DEG) in semiconductor heterostructures. To describe collective plasma excitations in the 2DEG, we develop a generalized transmission line theoretical formalism consis... [Phys. Rev. B 86, 235316] Published Fri Dec 28, 2012

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Structural and electronic properties of the Pb/Ge(111)-β(sqrt[3]×sqrt[3])R30^{∘} surface studied by photoelectron spectroscopy and first-principles calculations (2012)

Koichiro Yaji, Shinichiro Hatta, Tetsuya Aruga, and Hiroshi Okuyama

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Koichiro Yaji, Shinichiro Hatta, Tetsuya Aruga, and Hiroshi Okuyama We have studied structural and electronic properties of a Ge(111) surface covered with a monatomic Pb layer [Pb/Ge(111)- β ] by means of core-level photoelectron spectroscopy, angle-resolved photoelectron spectroscopy (ARPES), and a first-principles band structure calculation. There has been a controv... [Phys. Rev. B 86, 235317] Published Fri Dec 28, 2012

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Control of electron-hole pair generation by biharmonic voltage drive of a quantum point contact (2012)

Mihajlo Vanević and Wolfgang Belzig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Mihajlo Vanević and Wolfgang Belzig A time-dependent electromagnetic field creates electron-hole excitations in a Fermi sea at low temperature. We show that the electron-hole pairs can be generated in a controlled way using harmonic and biharmonic time-dependent voltages applied to a quantum contact, and we obtain the probabilities of... [Phys. Rev. B 86, 241306] Published Fri Dec 28, 2012

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k·p model for the energy dispersions and absorption spectra of InAs/GaSb type-II superlattices (2012)

Y. Livneh, P. C. Klipstein, O. Klin, N. Snapi, S. Grossman, A. Glozman, and E. Weiss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-21

Description: Author(s): Y. Livneh, P. C. Klipstein, O. Klin, N. Snapi, S. Grossman, A. Glozman, and E. Weiss We have fitted the k · p model derived recently by one of the authors [ Klipstein Phys. Rev. B 81 235314 (2010) ] to experimentally measured photoabsorption spectra at 77 and 300 K for representative InAs/GaSb superlattices with band-gap wavelengths between 4.3 and 10.5 μ m. The model is able to reprod... [Phys. Rev. B 86, 235311] Published Thu Dec 20, 2012

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Anomalous double-layer step formation on Si(100) in hydrogen process ambient (2012)

Sebastian Brückner, Henning Döscher, Peter Kleinschmidt, Oliver Supplie, Anja Dobrich, and Thomas Hannappel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Sebastian Brückner, Henning Döscher, Peter Kleinschmidt, Oliver Supplie, Anja Dobrich, and Thomas Hannappel We prepared Si(100) surfaces with anomalous atomic double-layer steps grown via chemical vapor deposition. Scanning tunneling microscopy resolved D A -type steps, supported by low-energy electron diffraction, Fourier-transform infrared spectroscopy, and in situ reflection anisotropy spectroscopy, whic... [Phys. Rev. B 86, 195310] Published Mon Nov 12, 2012

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Electronic transport through EuO spin-filter tunnel junctions (2012)

Nuttachai Jutong, Ivan Rungger, Cosima Schuster, Ulrich Eckern, Stefano Sanvito, and Udo Schwingenschlögl

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Nuttachai Jutong, Ivan Rungger, Cosima Schuster, Ulrich Eckern, Stefano Sanvito, and Udo Schwingenschlögl Epitaxial spin-filter tunnel junctions based on the ferromagnetic semiconductor europium monoxide (EuO) are investigated by means of density functional theory. In particular, we focus on the spin transport properties of Cu(100)/EuO(100)/Cu(100) junctions. The dependence of the transmission coefficie... [Phys. Rev. B 86, 205310] Published Mon Nov 12, 2012

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Electrostatic effects and band bending in doped topological insulators (2012)

Dimitrios Galanakis and Tudor D. Stanescu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Dimitrios Galanakis and Tudor D. Stanescu We investigate the electrostatic effects in doped topological insulators by developing a self-consistent scheme for an interacting tight-binding model. The presence of bulk carriers, in addition to surface electrons, generates an intrinsic inhomogeneous charge density in the vicinity of the surface ... [Phys. Rev. B 86, 195311] Published Mon Nov 12, 2012

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Fine structure of the band-edge excitons and trions in CdSe/CdS core/shell nanocrystals (2012)

A. Shabaev, A. V. Rodina, and Al. L. Efros

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): A. Shabaev, A. V. Rodina, and Al. L. Efros We present a theoretical description of excitons and positively and negatively charged trions in “giant” CdSe/CdS core-shell nanocrystals (NCs). The developed theory provides the parameters describing the fine structure of excitons in CdSe/CdS core/thick shell NCs as a function of the CdSe/CdS condu... [Phys. Rev. B 86, 205311] Published Mon Nov 12, 2012

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Enhancing phonon transmission across a Si/Ge interface by atomic roughness: First-principles study with the Green's function method (2012)

Zhiting Tian, Keivan Esfarjani, and Gang Chen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Zhiting Tian, Keivan Esfarjani, and Gang Chen Knowledge on phonon transmittance as a function of phonon frequency and incidence angle at interfaces is vital for multiscale modeling of heat transport in nanostructured materials. Although thermal conductivity reduction in nanostructured materials can usually be described by phonon scattering due ... [Phys. Rev. B 86, 235304] Published Mon Dec 10, 2012

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Microwave-induced resistance oscillations in tilted magnetic fields (2012)

A. Bogan, A. T. Hatke, S. A. Studenikin, A. Sachrajda, M. A. Zudov, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): A. Bogan, A. T. Hatke, S. A. Studenikin, A. Sachrajda, M. A. Zudov, L. N. Pfeiffer, and K. W. West We have studied the effect of an in-plane magnetic field on microwave-induced resistance oscillations in a high mobility two-dimensional electron system. We have found that the oscillation amplitude decays exponentially with an in-plane component of the magnetic field B ∥ . While these findings cannot... [Phys. Rev. B 86, 235305] Published Mon Dec 10, 2012

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Formation of polar InN with surface Fermi level near the valence band maximum by means of ammonia nitridation (2012)

J. Dahl, M. Kuzmin, J. Adell, T. Balasubramanian, and P. Laukkanen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): J. Dahl, M. Kuzmin, J. Adell, T. Balasubramanian, and P. Laukkanen Development of InN films for devices is hindered due to metallic In clusters, formed readily during growth, and unintentional n -type conductivity of the nominally undoped films, including surface electron-accumulation layers via the Fermi level pinning into the conduction band. Plasma nitridation el... [Phys. Rev. B 86, 245304] Published Mon Dec 10, 2012

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Cotunneling in the ν=5/2 fractional quantum Hall regime (2012)

Robert Zielke, Bernd Braunecker, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-13

Description: Author(s): Robert Zielke, Bernd Braunecker, and Daniel Loss We show that cotunneling in the 5/2 fractional quantum Hall regime allows us to test the Moore-Read wave function, proposed for this regime, and to probe the nature of the fractional charge carriers. We calculate the cotunneling current for electrons that tunnel between two quantum Hall edge states ... [Phys. Rev. B 86, 235307] Published Wed Dec 12, 2012

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Anisotropic Fermi contour of (001) GaAs holes in parallel magnetic fields (2012)

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-14

Description: Author(s): D. Kamburov, M. Shayegan, R. Winkler, L. N. Pfeiffer, K. W. West, and K. W. Baldwin We report a severe, spin-dependent, Fermi contour anisotropy induced by parallel magnetic field in a high-mobility (001) GaAs two-dimensional hole system. Employing commensurability oscillations created by a unidirectional, surface-strain-induced, periodic potential modulation, we directly probe the... [Phys. Rev. B 86, 241302] Published Thu Dec 13, 2012

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Geometrical pumping in quantum transport: Quantum master equation approach (2012)

Tatsuro Yuge, Takahiro Sagawa, Ayumu Sugita, and Hisao Hayakawa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-15

Description: Author(s): Tatsuro Yuge, Takahiro Sagawa, Ayumu Sugita, and Hisao Hayakawa For an open quantum system, we investigate the pumped current induced by a slow modulation of control parameters on the basis of the quantum master equation and full counting statistics. We find that the average and the cumulant generating function of the pumped quantity are characterized by the geo... [Phys. Rev. B 86, 235308] Published Fri Dec 14, 2012

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Resonant regimes in the Fock-space coherence of multilevel quantum dots (2012)

Eduardo Vaz and Jordan Kyriakidis

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-18

Description: Author(s): Eduardo Vaz and Jordan Kyriakidis The coherence between quantum states with different particle numbers—the Fock-space coherence—qualitatively differs from the more common Hilbert-space coherence between states with equal particle numbers. For a quantum dot with multiple channels available for transport, we find the conditions for de... [Phys. Rev. B 86, 235310] Published Mon Dec 17, 2012

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Quantum nanostructures in strongly spin-orbit coupled two-dimensional systems (2012)

Emmanuel I. Rashba

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): Emmanuel I. Rashba Recent progress in experimental studies of low-dimensional systems with strong spin-orbit coupling poses a question on the effect of this coupling on the energy spectrum of electrons in semiconductor nanostructures. It is shown in this paper that this effect is profound in the strong coupling limit.... [Phys. Rev. B 86, 125319] Published Mon Sep 24, 2012

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Impurity states in the quantum spin Hall phase in graphene (2012)

J. W. González and J. Fernández-Rossier

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): J. W. González and J. Fernández-Rossier Two-dimensional insulators with time-reversal symmetry can have two topologically different phases, the quantum spin Hall and the normal phase. The former is revealed by the existence of conducting edge states that are topologically protected. Here we show that the reaction to impurity, in bulk, is ... [Phys. Rev. B 86, 115327] Published Fri Sep 21, 2012

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Energy scaling of compositional disorder in Ga(N,P,As)/GaP quantum well structures (2012)

K. Jandieri, M. K. Shakfa, S. Liebich, M. Zimprich, B. Kunert, C. Karcher, A. Chernikov, K. Volz, W. Stolz, M. Koch, S. Chatterjee, W. Heimbrodt, F. Gebhard, and S. D. Baranovskii

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): K. Jandieri, M. K. Shakfa, S. Liebich, M. Zimprich, B. Kunert, C. Karcher, A. Chernikov, K. Volz, W. Stolz, M. Koch, S. Chatterjee, W. Heimbrodt, F. Gebhard, and S. D. Baranovskii In many-component semiconductor heterostructures photoluminescence (PL) is strongly affected by the disorder potentials caused by compositional fluctuations. We present an experimental study on the temperature-dependent PL in the Ga(N,P,As)/GaP quantum well which indicates the intriguing feature tha... [Phys. Rev. B 86, 125318] Published Fri Sep 21, 2012

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Enhanced spontaneous optical emission from inhomogeneous ensembles of quantum dots is induced by short-range coupling (2012)

Michał Kozub, Łukasz Pawicki, and Paweł Machnikowski

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): Michał Kozub, Łukasz Pawicki, and Paweł Machnikowski We study theoretically the spontaneous emission from an inhomogeneous ensemble of quantum dots in the weak excitation limit. We show that collective, superradiancelike effects lead to an enhanced emission rate in the presence of sufficiently strong coupling between the dots, in agreement with experi... [Phys. Rev. B 86, 121305] Published Fri Sep 21, 2012

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Atomic effective pseudopotentials for semiconductors (2012)

J. R. Cárdenas and G. Bester

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-28

Description: Author(s): J. R. Cárdenas and G. Bester We derive an analytic connection between the screened self-consistent effective potential from density-functional theory (DFT) and atomic effective pseudopotentials (AEPs). The motivation to derive AEPs is to address structures with thousands to hundreds of thousands of atoms, as given in most nanos... [Phys. Rev. B 86, 115332] Published Thu Sep 27, 2012

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Structural, electrical, and optical properties of hydrogen-doped ZnO films (2012)

Achim Kronenberger, Angelika Polity, Detlev M. Hofmann, Bruno K. Meyer, André Schleife, and Friedhelm Bechstedt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-29

Description: Author(s): Achim Kronenberger, Angelika Polity, Detlev M. Hofmann, Bruno K. Meyer, André Schleife, and Friedhelm Bechstedt Hydrogen doped ZnO thin films were deposited by radio frequency magnetron sputtering from a ceramic target on c -plane sapphire and fused silica using H 2 and O 2 as reactive gases. Structural analysis revealed that all films are polycrystalline with the c axis oriented perpendicularly to the substrate... [Phys. Rev. B 86, 115334] Published Fri Sep 28, 2012

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Finite-frequency noise properties of the nonequilibrium Anderson impurity model (2012)

Christoph P. Orth, Daniel F. Urban, and Andreas Komnik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-29

Description: Author(s): Christoph P. Orth, Daniel F. Urban, and Andreas Komnik We analyze the spectrum of the electric-current autocorrelation function (noise power) in the Anderson impurity model biased by a finite transport voltage. Special emphasis is placed on the interplay of nonequilibrium effects and electron-electron interactions. Analytic results are presented for a p... [Phys. Rev. B 86, 125324] Published Fri Sep 28, 2012

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Electron spin orientation under in-plane optical excitation in GaAs quantum wells (2012)

S. Pfalz, R. Winkler, N. Ubbelohde, D. Hägele, and M. Oestreich

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-02

Description: Author(s): S. Pfalz, R. Winkler, N. Ubbelohde, D. Hägele, and M. Oestreich We study the optical orientation of electron spins in GaAs/AlGaAs quantum wells for excitation in the growth direction and for in-plane excitation. Time- and polarization-resolved photoluminescence excitation measurements show, for resonant excitation of the heavy-hole conduction band transition, a ... [Phys. Rev. B 86, 165301] Published Mon Oct 01, 2012

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Accelerated molecular dynamics study of the GaAs(001)β2(2×4)/c(2×8) surface (2012)

Yangzheng Lin and Kristen A. Fichthorn

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-03

Description: Author(s): Yangzheng Lin and Kristen A. Fichthorn We develop an accelerated molecular dynamics method that has several advantages over conventional rare-event methods. We apply our method using a semiempirical Tersoff-Abell potential to understand the disordered structure of the GaAs(001) β 2(2×4) surface at various temperatures. Our simulations indi... [Phys. Rev. B 86, 165303] Published Tue Oct 02, 2012

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Magneto-optical studies of ensembles of semimagnetic self-organized Cd(Mn)Se/Zn(Mn)Se quantum dots (2012)

I. I. Reshina, S. V. Ivanov, and A. A. Toropov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-04

Description: Author(s): I. I. Reshina, S. V. Ivanov, and A. A. Toropov Ensembles of Cd(Mn)Se/Zn(Mn)Se semimagnetic self-organized quantum dots with different Mn content have been studied by photoluminescence and Raman scattering under strong magnetic fields in Faraday and Voigt geometries and with selective excitation. Electron spin-flip transitions have been observed ... [Phys. Rev. B 86, 155302] Published Wed Oct 03, 2012

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Elastic constants, composition, and piezolectric polarization in In_{x}Al_{1−x}N: From ab initio calculations to experimental implications for the applicability of Vegard's rule (2012)

M.-Y. Xie, F. Tasnádi, I. A. Abrikosov, L. Hultman, and V. Darakchieva

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): M.-Y. Xie, F. Tasnádi, I. A. Abrikosov, L. Hultman, and V. Darakchieva We present a theoretical analysis on the applicability of Vegard's linear rule in In x Al 1− x N alloys in relation to strain related elastic and piezoelectric properties. We derive the elastic stiffness constants and biaxial coefficients, as well as the respective deviations from linearity (Vegard's rul... [Phys. Rev. B 86, 155310] Published Fri Oct 12, 2012

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Electric control of the exciton fine structure in nonparabolic quantum dots (2012)

Erik Welander and Guido Burkard

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): Erik Welander and Guido Burkard We show that the nonparabolic confinement potential is responsible for the nonmonotonic behavior and sign change of the exciton fine-structure splitting (FSS) in optically active self-assembled quantum dots. This insight is important for the theoretical understanding and practical control by electri... [Phys. Rev. B 86, 165312] Published Fri Oct 12, 2012

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Particle entanglement spectra for quantum Hall states on lattices (2012)

Antoine Sterdyniak, Nicolas Regnault, and Gunnar Möller

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): Antoine Sterdyniak, Nicolas Regnault, and Gunnar Möller We use particle entanglement spectra to characterize bosonic quantum Hall states on lattices, motivated by recent studies of bosonic atoms on optical lattices. Unlike for the related problem of fractional Chern insulators, very good trial wave functions are known for fractional quantum Hall states o... [Phys. Rev. B 86, 165314] Published Fri Oct 12, 2012

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Surface states scattering from a step defect in the topological insulator Bi_{2}Te_{3} (2012)

Jin An and C. S. Ting

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): Jin An and C. S. Ting We study theoretically, using a quantum-mechanical approach, the general scattering problem of a straight step defect on the surface of the topological insulator Bi 2 Te 3 with a strong warping effect. At high energy where the warping effect is large, an electron incident on a step defect running along... [Phys. Rev. B 86, 165313] Published Fri Oct 12, 2012

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Plasmonic effects in excitonic population transfer in a driven semiconductor–metal nanoparticle hybrid system (2012)

M. A. Antón, F. Carreño, Sonia Melle, Oscar G. Calderón, E. Cabrera-Granado, Joel Cox, and Mahi R. Singh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-06

Description: Author(s): M. A. Antón, F. Carreño, Sonia Melle, Oscar G. Calderón, E. Cabrera-Granado, Joel Cox, and Mahi R. Singh We have investigated the coherent transfer of excitonic populations in a semiconductor quantum dot (SQD) modulated by the surface plasmon of a metallic nanoparticle (MNP). The SQD is considered as a three-level V-type atomic system. We applied a transform-limited laser pulse field resonant with the ... [Phys. Rev. B 86, 155305] Published Fri Oct 05, 2012

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Inhomogeneous longitudinal electric field-induced anomalous Hall conductivity in a ferromagnetic two-dimensional electron gas (2012)

Ankur Sensharma and Sudhansu S. Mandal

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-06

Description: Author(s): Ankur Sensharma and Sudhansu S. Mandal It is known that the anomalous Hall conductivity (AHC) in a disordered two-dimensional electron system with a Rashba spin-orbit interaction and a finite ferromagnetic spin-exchange energy, is zero in the metallic weak-scattering regime because of the exact cancellation of the bare-bubble contributio... [Phys. Rev. B 86, 165305] Published Fri Oct 05, 2012

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Optical control of the spin state of two Mn atoms in a quantum dot (2012)

L. Besombes, C. L. Cao, S. Jamet, H. Boukari, and J. Fernández-Rossier

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-06

Description: Author(s): L. Besombes, C. L. Cao, S. Jamet, H. Boukari, and J. Fernández-Rossier We report on the optical spectroscopy of the spin of two magnetic atoms (Mn) embedded in an individual quantum dot interacting with a single electron, a single exciton, or a single trion. As a result of their interaction to a common entity, the Mn spins become correlated. The dynamics of this proces... [Phys. Rev. B 86, 165306] Published Fri Oct 05, 2012

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Surface organization of homoepitaxial InP films grown by metalorganic vapor-phase epitaxy (2012)

A. Gocalinska, M. Manganaro, E. Pelucchi, and D. D. Vvedensky

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-09

Description: Author(s): A. Gocalinska, M. Manganaro, E. Pelucchi, and D. D. Vvedensky We present a systematic study of the morphology of homoepitaxial InP films grown by metalorganic vapor-phase epitaxy which are imaged with ex situ atomic force microscopy. These films show a dramatic range of different surface morphologies as a function of the growth conditions and substrate (growth... [Phys. Rev. B 86, 165307] Published Mon Oct 08, 2012

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Anisotropy of spin polarization and spin accumulation in Si/Al_{2}O_{3}/ferromagnet tunnel devices (2012)

S. Sharma, S. P. Dash, H. Saito, S. Yuasa, B. J. van Wees, and R. Jansen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-09

Description: Author(s): S. Sharma, S. P. Dash, H. Saito, S. Yuasa, B. J. van Wees, and R. Jansen The contribution of the spin accumulation to tunneling anisotropy in Si/Al 2 O 3 /ferromagnet devices was investigated. Rotation of the magnetization of the ferromagnet from in-plane to perpendicular to the tunnel interface reveals a tunneling anisotropy that depends on the type of the ferromagnet (Fe o... [Phys. Rev. B 86, 165308] Published Mon Oct 08, 2012

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Two-dimensional Fourier spectroscopy applied to electron-phonon correlations in quantum well intersubband systems (2012)

Thi Uyen-Khanh Dang, Carsten Weber, Sebastian Eiser, Andreas Knorr, and Marten Richter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-10

Description: Author(s): Thi Uyen-Khanh Dang, Carsten Weber, Sebastian Eiser, Andreas Knorr, and Marten Richter Two-dimensional photon echo spectroscopy allows one to track relaxation and correlation processes in optically excited nanostructures. We analyze such spectra for intersubband transitions in an n -doped GaAs/Al 0.35 Ga 0.65 As single quantum well. Focusing on electron-longitudinal optical phonon interact... [Phys. Rev. B 86, 155306] Published Tue Oct 09, 2012

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Dynamical decoupling of a singlet-triplet qubit afflicted by a charge fluctuator (2012)

Guy Ramon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): Guy Ramon The efficiency of dynamical decoupling pulse sequences in removing noise due to a nearby charge fluctuator is studied for a singlet-triplet spin qubit. We develop a numerical method to solve the dynamical equations for all three components of the Bloch vector under a general pulse protocol, where pu... [Phys. Rev. B 86, 125317] Published Fri Sep 21, 2012

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Band-gap profiling by laser writing of hydrogen-containing III-N-Vs (2012)

N. Balakrishnan, G. Pettinari, O. Makarovsky, L. Turyanska, M. W. Fay, M. De Luca, A. Polimeni, M. Capizzi, F. Martelli, S. Rubini, and A. Patanè

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-11

Description: Author(s): N. Balakrishnan, G. Pettinari, O. Makarovsky, L. Turyanska, M. W. Fay, M. De Luca, A. Polimeni, M. Capizzi, F. Martelli, S. Rubini, and A. Patanè We show that the dissociation of the N-H complex in hydrogenated III-N-Vs can be laser activated at temperatures that are significantly smaller than those (〉200 °C) required for thermal dissociation due to a resonant photon absorption by the N-H complex. This phenomenon provides a mechanism for p... [Phys. Rev. B 86, 155307] Published Wed Oct 10, 2012

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Influence of the atomic-scale structure on the exciton fine-structure splitting in InGaAs and GaAs quantum dots in a vertical electric field (2012)

Jun-Wei Luo, Ranber Singh, Alex Zunger, and Gabriel Bester

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-11

Description: Author(s): Jun-Wei Luo, Ranber Singh, Alex Zunger, and Gabriel Bester We investigate the vertical electric field tuning of the exciton fine-structure splitting (FSS) in several InGaAs and GaAs quantum dots (QDs) using the atomistic empirical pseudopotential approach and configuration interaction. We find that the FSS is surprisingly tunable, with a rate similar to the... [Phys. Rev. B 86, 161302] Published Wed Oct 10, 2012

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Decay of Shockley surface state by randomly adsorbed Bi atoms at Ag(111) surfaces (2012)

Hiroyuki Fukumoto, Yuki Aoki, and Hiroyuki Hirayama

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-12

Description: Author(s): Hiroyuki Fukumoto, Yuki Aoki, and Hiroyuki Hirayama The decay of the Shockley surface state by randomly adsorbed Bi atoms at Ag(111) surfaces was investigated. As the Bi coverage ( θ Bi ) increased, the energy dispersion E ( k ) was observed to deviate from the intrinsic downward parabolic dispersion of the Ag(111) Shockley surface state at the low-energy ... [Phys. Rev. B 86, 165311] Published Thu Oct 11, 2012

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Thermoelectric properties of ultrathin silicon nanowires (2012)

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): E. B. Ramayya, L. N. Maurer, A. H. Davoody, and I. Knezevic We calculate the room-temperature thermoelectric properties of highly doped ultrathin silicon nanowires (SiNW) of square cross section (3 × 3 to 8 × 8 nm 2 ) by solving the Boltzmann transport equations for electrons and phonons on an equal footing, using the ensemble Monte Carlo technique for each. W... [Phys. Rev. B 86, 115328] Published Mon Sep 24, 2012

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Bunched photon statistics of the spectrally diffusive photoluminescence of single self-assembled GaAs quantum dots (2012)

Marco Abbarchi, Takashi Kuroda, Takaaki Mano, Massimo Gurioli, and Kazuaki Sakoda

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): Marco Abbarchi, Takashi Kuroda, Takaaki Mano, Massimo Gurioli, and Kazuaki Sakoda Spectral diffusion in the optical transition of self-assembled GaAs quantum dots is studied using the intensity correlation functions of spectrally filtered photoluminescence signals. Analysis of the bunched photon correlation reveals the statistical nature of frequency drift over six orders of magn... [Phys. Rev. B 86, 115330] Published Wed Sep 26, 2012

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Quantum beats due to excitonic ground-state splitting in colloidal quantum dots (2012)

J. Bylsma, P. Dey, J. Paul, S. Hoogland, E. H. Sargent, J. M. Luther, M. C. Beard, and D. Karaiskaj

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): J. Bylsma, P. Dey, J. Paul, S. Hoogland, E. H. Sargent, J. M. Luther, M. C. Beard, and D. Karaiskaj The dephasing of PbS quantum dots has been carefully measured using three pulse four-wave mixing and two-dimensional nonlinear optical spectroscopy. The temperature dependence of the homogeneous linewidth obtained from the two-dimensional spectra indicates significant scattering by acoustic phonons,... [Phys. Rev. B 86, 125322] Published Wed Sep 26, 2012

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Optical orientation of the homogeneous nonequilibrium Bose-Einstein condensate of exciton polaritons (2012)

V. L. Korenev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-12

Description: Author(s): V. L. Korenev A simple model, describing the steady state of the nonequilibrium polarization of a homogeneous Bose-Einstein condensate of exciton polaritons, is considered. It explains the suppression of spin splitting of a nonequilibrium polariton condensate in an external magnetic field, the linear polarization... [Phys. Rev. B 86, 035310] Published Wed Jul 11, 2012

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Large crystal local-field effects in second-harmonic generation of a Si/CaF_{2} interface: An ab initio study (2012)

Matteo Bertocchi, Eleonora Luppi, Elena Degoli, Valérie Véniard, and Stefano Ossicini

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-12

Description: Author(s): Matteo Bertocchi, Eleonora Luppi, Elena Degoli, Valérie Véniard, and Stefano Ossicini In this work we present the ab initio study of crystal local-field effects in second-harmonic generation spectroscopy for an interface material such as Si/CaF 2 . Starting from an independent particle picture, we demonstrate the fundamental importance of the polarization effects at the interface disco... [Phys. Rev. B 86, 035309] Published Wed Jul 11, 2012

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Dynamic control of photoluminescence polarization properties in GaAs/AlAs quantum wells by surface acoustic waves (2012)

Tetsuomi Sogawa, Haruki Sanada, Hideki Gotoh, Hiroshi Yamaguchi, and Paulo V. Santos

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-14

Description: Author(s): Tetsuomi Sogawa, Haruki Sanada, Hideki Gotoh, Hiroshi Yamaguchi, and Paulo V. Santos We have investigated the dynamic polarization properties of photoluminescence (PL) spectra in GaAs/AlAs quantum wells (QWs) modulated by surface acoustic waves (SAWs) in various configurations. One-dimensional standing SAWs, which are formed by the interference of two counterpropagating SAW beams, e... [Phys. Rev. B 86, 035311] Published Fri Jul 13, 2012

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In-plane magnetic field dependence of cyclotron relaxation time in a Si two-dimensional electron system (2012)

Tasuku Chiba, Ryuichi Masutomi, Kentarou Sawano, Yasuhiro Shiraki, and Tohru Okamoto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-07-14

Description: Author(s): Tasuku Chiba, Ryuichi Masutomi, Kentarou Sawano, Yasuhiro Shiraki, and Tohru Okamoto Cyclotron resonance of two-dimensional electrons is studied for a high-mobility Si/SiGe quantum well in the presence of an in-plane magnetic field, which induces spin polarization. The relaxation time τ CR shows a negative in-plane magnetic-field dependence, which is similar to that of the transport ... [Phys. Rev. B 86, 045310] Published Fri Jul 13, 2012

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Exciton localization in doped Si nanocrystals from single dot spectroscopy studies (2012)

I. Sychugov, J. Valenta, K. Mitsuishi, and J. Linnros

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-17

Description: Author(s): I. Sychugov, J. Valenta, K. Mitsuishi, and J. Linnros The results of low-temperature photoluminescence characterization of single silicon nanocrystals prepared from highly doped silicon-on-insulator wafers are presented. The effect of B, P, As, and Sb impurities on ensemble as well as individual emission spectra are determined by comparison with the li... [Phys. Rev. B 86, 075311] Published Thu Aug 16, 2012

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Nanomechanical resonator coupled linearly via its momentum to a quantum point contact (2012)

Latchezar L. Benatov and Miles P. Blencowe

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-21

Description: Author(s): Latchezar L. Benatov and Miles P. Blencowe We use a Born-Markov approximated master equation approach to study the symmetrized-in-frequency current noise spectrum and the oscillator steady state of a nanoelectromechanical system where a nanoscale resonator is coupled linearly via its momentum to a quantum point contact (QPC). Our current noi... [Phys. Rev. B 86, 075313] Published Mon Aug 20, 2012

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Sharp exponential band tails in highly disordered lead sulfide quantum dot arrays (2012)

Peter T. Erslev, Hsiang-Yu Chen, Jianbo Gao, Matthew C. Beard, Arthur J. Frank, Jao van de Lagemaat, Justin C. Johnson, and Joseph M. Luther

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-18

Description: Author(s): Peter T. Erslev, Hsiang-Yu Chen, Jianbo Gao, Matthew C. Beard, Arthur J. Frank, Jao van de Lagemaat, Justin C. Johnson, and Joseph M. Luther We employ temperature-dependent, illumination intensity modulated photocurrent spectroscopy (IMPS) to investigate the intra-band-gap density of states in films of PbS quantum dots (QDs). Using both coplanar electrode and stacked photovoltaic device configurations, IMPS measurements of PbS QD arrays ... [Phys. Rev. B 86, 155313] Published Wed Oct 17, 2012

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Quantum oscillation of Rashba spin splitting in topological insulator Bi_{2}Se_{3} induced by the quantum size effects of Pb adlayers (2012)

Hong Yang, Xiangyang Peng, Xiaolin Wei, Wenliang Liu, Wenguang Zhu, Di Xiao, G. Malcolm Stocks, and Jianxin Zhong

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-24

Description: Author(s): Hong Yang, Xiangyang Peng, Xiaolin Wei, Wenliang Liu, Wenguang Zhu, Di Xiao, G. Malcolm Stocks, and Jianxin Zhong Based on first-principles calculations within density functional theory, we find that Pb adlayers can induce a giant Rashba spin splitting in the quantum well states of an underlying Bi 2 Se 3 film. As the thickness of the Pb adlayers varies, the distance between the Pb adlayer and the Bi 2 Se 3 film, the... [Phys. Rev. B 86, 155317] Published Tue Oct 23, 2012

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Disorder-induced Majorana metal in interacting non-Abelian anyon systems (2012)

Chris R. Laumann, Andreas W. W. Ludwig, David A. Huse, and Simon Trebst

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-12

Description: Author(s): Chris R. Laumann, Andreas W. W. Ludwig, David A. Huse, and Simon Trebst We demonstrate that a thermal metal of Majorana fermions forms in a two-dimensional system of interacting non-Abelian (Ising) anyons in the presence of moderate disorder. This bulk metallic phase arises in the ν =5/2 quantum Hall state when disorder pins the anyonic quasiparticles. More generally, it... [Phys. Rev. B 85, 161301] Published Wed Apr 11, 2012

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Magnetic anisotropies of quantum dots doped with magnetic ions (2012)

Karel Výborný, J. E. Han, Rafał Oszwałdowski, Igor Žutić, and A. G. Petukhov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): Karel Výborný, J. E. Han, Rafał Oszwałdowski, Igor Žutić, and A. G. Petukhov Magnetic anisotropies in quantum dots (QDs) doped with magnetic ions are discussed in terms of two frameworks: anisotropic g factors and magnetocrystalline anisotropy energy. It is shown that even a simple model of zinc-blende p -doped QDs displays a rich diagram of magnetic anisotropies in the QD pa... [Phys. Rev. B 85, 155312] Published Thu Apr 12, 2012

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Polariton states bound to defects in GaAs/AlAs planar microcavities (2012)

Joanna M. Zajac, Wolfgang Langbein, Maxime Hugues, and Mark Hopkinson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): Joanna M. Zajac, Wolfgang Langbein, Maxime Hugues, and Mark Hopkinson We report on polariton states bound to defects in planar GaAs/AlAs microcavities grown by molecular beam epitaxy. The defect types relevant for the spatial polariton dynamics in these structures are cross-hatch misfit dislocations, and point-like defects extended over several micrometers. We attribu... [Phys. Rev. B 85, 165309] Published Thu Apr 12, 2012

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Quantitative description for the growth rate of self-induced GaN nanowires (2012)

V. Consonni, V. G. Dubrovskii, A. Trampert, L. Geelhaar, and H. Riechert

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): V. Consonni, V. G. Dubrovskii, A. Trampert, L. Geelhaar, and H. Riechert We determine with high precision the growth rate of self-induced GaN nanowires grown by molecular beam epitaxy under various conditions from scanning electron micrographs by taking into account in situ measurements of the initial incubation time, which is needed before the nanowire growth starts. In... [Phys. Rev. B 85, 155313] Published Thu Apr 12, 2012

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Exact solution for spin and charge correlations in quantum dots: Effect of level fluctuations and Zeeman splitting (2012)

I. S. Burmistrov, Yuval Gefen, and M. N. Kiselev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): I. S. Burmistrov, Yuval Gefen, and M. N. Kiselev The inclusion of charging and spin-exchange interactions within the universal Hamiltonian description of quantum dots is challenging as it leads to a non-Abelian action. Here we present an exact analytical solution to the problem, in particular, in the vicinity of the Stoner instability. We calculat... [Phys. Rev. B 85, 155311] Published Thu Apr 12, 2012

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Out-of-plane equilibrium spin current in a quasi-two-dimensional electron gas under in-plane magnetic field (2012)

E. Nakhmedov and O. Alekperov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-17

Description: Author(s): E. Nakhmedov and O. Alekperov Equilibrium spin current is calculated in a quasi-two-dimensional electron gas with finite thickness under in-plane magnetic field and in the presence of Rashba- and Dresselhaus spin-orbit interactions. The out-off-plane component of the equilibrium spin current appears to be nonzero in the presence... [Phys. Rev. B 85, 153302] Published Mon Apr 16, 2012

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Intertwining of Zeeman and Coulomb interactions on excitons in highly symmetric semiconductor quantum dots (2012)

D. Y. Oberli

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-07

Description: Author(s): D. Y. Oberli We present an experimental study and develop a group theoretical analysis of the Zeeman effect on excitons in pyramidal semiconductor quantum dots possessing the symmetries of the C 3 v point group. The magnetic field dependence of the emission pattern originating from neutral exciton states is invest... [Phys. Rev. B 85, 155305] Published Fri Apr 06, 2012

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Conductance fluctuations induced by bulk state in quasi-one-dimensional strips of topological insulator (2012)

Y. Takagaki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-10

Description: Author(s): Y. Takagaki We numerically calculate the conductance of a topological insulator confined as quasi-one-dimensional strips using a four-band Hamiltonian. The conductance is nearly unchanged in the presence of a short-range disorder when the Fermi level is located in the bulk band gap. Helical edge states of topol... [Phys. Rev. B 85, 155308] Published Mon Apr 09, 2012

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Giant optical vortex in photonic crystal waveguide with nonlinear optical cavity (2012)

Evgeny N. Bulgakov and Almas F. Sadreev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-10

Description: Author(s): Evgeny N. Bulgakov and Almas F. Sadreev We consider light transmission in a directional photonic crystal waveguide that holds a nonlinear defect with two resonant dipole modes within the light propagation band. For the defect positioned on the center line of the waveguide, there are two ways to break the mirror symmetry with respect to ei... [Phys. Rev. B 85, 165305] Published Mon Apr 09, 2012

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Wave-function Monte Carlo method for polariton condensates (2012)

Michiel Wouters

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-07

Description: Author(s): Michiel Wouters We present a quantum jump approach to describe coupled quantum and classical systems in the context of Bose-Einstein condensation in the solid state. In our formalism, the excitonic gain medium is described by classical rate equations, while the polariton modes are described fully quantum-mechanical... [Phys. Rev. B 85, 165303] Published Fri Apr 06, 2012

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Fundamental temperature-dependent properties of the Si nanocrystal band gap (2012)

A. M. Hartel, S. Gutsch, D. Hiller, and M. Zacharias

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): A. M. Hartel, S. Gutsch, D. Hiller, and M. Zacharias Ever since the first reports about low-temperature photoluminescence (PL) measurements of Si nanocrystals Si (NCs), a severe deviation from the equations commonly used to describe the temperature dependence of the band-gap energy for bulk materials was reported. Our analysis reveals that the formerl... [Phys. Rev. B 85, 165306] Published Thu Apr 12, 2012

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Dopant enhanced neutralization of low-energy Li^{+} scattered from Si(111) (2012)

R. D. Gann, Z. Sroubek, and J. A. Yarmoff

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): R. D. Gann, Z. Sroubek, and J. A. Yarmoff The neutralization of 3 keV Li + ions scattered from Si(111) is measured as a function of doping density, dopant type, and hydrogen coverage. When the surfaces are saturated with hydrogen to unpin the Fermi level, the neutral fractions decrease for lightly doped samples but become anomalously large f... [Phys. Rev. B 85, 165307] Published Thu Apr 12, 2012

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Formation of inversion layers in organic field-effect transistors (2012)

J. J. Brondijk, M. Spijkman, F. van Seijen, P. W. M. Blom, and D. M. de Leeuw

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): J. J. Brondijk, M. Spijkman, F. van Seijen, P. W. M. Blom, and D. M. de Leeuw An inversion current in unipolar organic field-effect transistors is not observed, which can be due to trapping of electrons or to negligible electron injection. Here, we distinguish between both cases by studying the depletion current of unipolar p -type transistors based on a deliberately doped org... [Phys. Rev. B 85, 165310] Published Thu Apr 12, 2012

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Fast preparation of a single-hole spin in an InAs/GaAs quantum dot in a Voigt-geometry magnetic field (2012)

T. M. Godden, J. H. Quilter, A. J. Ramsay, Yanwen Wu, P. Brereton, I. J. Luxmoore, J. Puebla, A. M. Fox, and M. S. Skolnick

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-12

Description: Author(s): T. M. Godden, J. H. Quilter, A. J. Ramsay, Yanwen Wu, P. Brereton, I. J. Luxmoore, J. Puebla, A. M. Fox, and M. S. Skolnick The preparation of a coherent heavy-hole spin via ionization of a spin-polarized electron-hole pair in an InAs/GaAs quantum dot in a Voigt geometry magnetic field is experimentally investigated. For a dot with a typical bright-exciton fine-structure splitting of 17 μ eV , the fidelity of the spin prep... [Phys. Rev. B 85, 155310] Published Wed Apr 11, 2012

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Cyclotron-resonant exciton transfer between the nearly free and strongly localized radiative states of a two-dimensional hole gas in a high magnetic field (2012)

L. Bryja, J. Jadczak, A. Wójs, G. Bartsch, D. R. Yakovlev, M. Bayer, P. Plochocka, M. Potemski, D. Reuter, and A. D. Wieck

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-13

Description: Author(s): L. Bryja, J. Jadczak, A. Wójs, G. Bartsch, D. R. Yakovlev, M. Bayer, P. Plochocka, M. Potemski, D. Reuter, and A. D. Wieck Avoided crossing of the emission lines of a nearly free positive trion and a cyclotron replica of an exciton bound to an interface acceptor has been observed in the magnetophotoluminescence spectra of p -doped GaAs quantum wells. Identification of the localized state depended on the precise mapping o... [Phys. Rev. B 85, 165308] Published Thu Apr 12, 2012

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Strong enhancement of Rashba spin-orbit coupling with increasing anisotropy in the Fock-Darwin states of a quantum dot (2012)

Siranush Avetisyan, Pekka Pietiläinen, and Tapash Chakraborty

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-14

Description: Author(s): Siranush Avetisyan, Pekka Pietiläinen, and Tapash Chakraborty We have investigated the electronic properties of elliptical quantum dots in a perpendicular external magnetic field, and in the presence of the Rashba spin-orbit interaction. Our work indicates that the Fock-Darwin spectra display a strong signature of Rashba spin-orbit coupling even in a low magne... [Phys. Rev. B 85, 153301] Published Fri Apr 13, 2012

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Crossover between two different Kondo couplings in side-coupled double quantum dots (2012)

Yoichi Tanaka, Norio Kawakami, and Akira Oguri

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-14

Description: Author(s): Yoichi Tanaka, Norio Kawakami, and Akira Oguri We study the Kondo effect in side-coupled double quantum dots with particular focus on the crossover between two distinct singlet ground states, using the numerical renormalization group. The crossover occurs as the quantized energy level of the embedded dot, which is connected directly to the leads... [Phys. Rev. B 85, 155314] Published Fri Apr 13, 2012

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Direct observation of nuclear field fluctuations in single quantum dots (2012)

R. Kaji, S. Adachi, H. Sasakura, and S. Muto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-04-14

Description: Author(s): R. Kaji, S. Adachi, H. Sasakura, and S. Muto The spin interaction between an electron and nuclei was investigated optically in a single self-assembled InAlAs quantum dot (QD). In spin dynamics at the initial stage, the fluctuation of nuclear field and the resulting electron spin relaxation time play a crucial role. We examined a positively cha... [Phys. Rev. B 85, 155315] Published Fri Apr 13, 2012

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Dephasing in Ge/SiGe quantum wells measured by means of coherent oscillations (2012)

K. Kolata, N. S. Köster, A. Chernikov, M. J. Drexler, E. Gatti, S. Cecci, D. Chrastina, G. Isella, M. Guzzi, and S. Chatterjee

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-01

Description: Author(s): K. Kolata, N. S. Köster, A. Chernikov, M. J. Drexler, E. Gatti, S. Cecci, D. Chrastina, G. Isella, M. Guzzi, and S. Chatterjee We present a dephasing time analysis of the excitonic resonances in Ge/SiGe quantum wells for various lattice temperatures by coherent oscillation spectroscopy (COS). The results are compared to the linewidths of the excitonic resonances determined from linear absorption measurements. Additionally, ... [Phys. Rev. B 86, 201303] Published Fri Nov 30, 2012

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Decoherence mechanisms of ^{209}Bi donor electron spins in isotopically pure ^{28}Si (2012)

Gary Wolfowicz, Stephanie Simmons, Alexei M. Tyryshkin, Richard E. George, Helge Riemann, Nikolai V. Abrosimov, Peter Becker, Hans-Joachim Pohl, Stephen A. Lyon, Mike L. W. Thewalt, and John J. L. Morton

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-05

Description: Author(s): Gary Wolfowicz, Stephanie Simmons, Alexei M. Tyryshkin, Richard E. George, Helge Riemann, Nikolai V. Abrosimov, Peter Becker, Hans-Joachim Pohl, Stephen A. Lyon, Mike L. W. Thewalt, and John J. L. Morton Bismuth ( 209 Bi) is the deepest group V donor in silicon and possesses the most extreme characteristics such as a 9/2 nuclear spin and a 1.5 GHz hyperfine coupling. These lead to several potential advantages for a Si:Bi donor electron spin qubit compared to the more common phosphorus donor. Most prev... [Phys. Rev. B 86, 245301] Published Tue Dec 04, 2012

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High guided mode–cavity mode coupling for an efficient extraction of spontaneous emission of a single quantum dot embedded in a photonic crystal nanobeam cavity (2012)

Alexandre Enderlin, Yasutomo Ota, Ryuichi Ohta, Naoto Kumagai, Satomi Ishida, Satoshi Iwamoto, and Yasuhiko Arakawa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-23

Description: Author(s): Alexandre Enderlin, Yasutomo Ota, Ryuichi Ohta, Naoto Kumagai, Satomi Ishida, Satoshi Iwamoto, and Yasuhiko Arakawa We demonstrate efficient extraction of a single InAs quantum dot spontaneous emission through an air-suspended waveguide to which a photonic crystal nanobeam cavity is coupled. First, the quantum dot emission into the cavity mode is enhanced due to a high Purcell effect arising from a large quality ... [Phys. Rev. B 86, 075314] Published Wed Aug 22, 2012

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Pulsed acousto-optic switching of a bistable cavity polariton system (2012)

S. S. Gavrilov and N. A. Gippius

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-23

Description: Author(s): S. S. Gavrilov and N. A. Gippius Theoretical studies have been made of nonequilibrium transitions in a planar exciton-polariton system under composite acousto-optic excitation: picosecond-long strain pulses causing reversible perturbations of exciton energy and stationary optic pump along the normal to the cavity surface. It is fou... [Phys. Rev. B 86, 085317] Published Wed Aug 22, 2012

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Tunable enhancement of light absorption and scattering in Si_{1−x}Ge_{x} nanowires (2012)

Houssem Kallel, Arnaud Arbouet, Gérard Ben; Assayag, Abdallah Chehaidar, Alexis Potié, Bassem Salem, Thierry Baron, and Vincent Paillard

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-23

Description: Author(s): Houssem Kallel, Arnaud Arbouet, Gérard BenAssayag, Abdallah Chehaidar, Alexis Potié, Bassem Salem, Thierry Baron, and Vincent Paillard Semiconducting nanowires (NWs) are good candidates for new optoelectronic or photovoltaic devices due to their excellent ability to guide, scatter, or absorb light, from near ultraviolet to near infrared. The existence of morphology-dependent optical resonances opens a promising route to overcome th... [Phys. Rev. B 86, 085318] Published Wed Aug 22, 2012

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Scalable qubit architecture based on holes in quantum dot molecules (2012)

Sophia E. Economou, Juan I. Climente, Antonio Badolato, Allan S. Bracker, Daniel Gammon, and Matthew F. Doty

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-25

Description: Author(s): Sophia E. Economou, Juan I. Climente, Antonio Badolato, Allan S. Bracker, Daniel Gammon, and Matthew F. Doty Spins confined in quantum dots are a leading candidate for solid-state quantum bits that can be coherently controlled by optical pulses. There are, however, many challenges to developing a scalable multibit information processing device based on spins in quantum dots, including the natural inhomogen... [Phys. Rev. B 86, 085319] Published Fri Aug 24, 2012

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Detection of spin polarization utilizing singlet and triplet states in a single-lead quantum dot (2012)

Tomohiro Otsuka, Yuuki Sugihara, Jun Yoneda, Shingo Katsumoto, and Seigo Tarucha

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-01

Description: Author(s): Tomohiro Otsuka, Yuuki Sugihara, Jun Yoneda, Shingo Katsumoto, and Seigo Tarucha We propose and demonstrate a new method to probe local spin polarization in semiconductor microdevices at low and zero magnetic fields. By connecting a single-lead quantum dot to a semiconductor microdevice and monitoring electron tunneling into singlet and triplet states in the dot, we can detect t... [Phys. Rev. B 86, 081308] Published Fri Aug 31, 2012

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Modeling the influence of doping on the performance of bulk heterojunction organic solar cells: One-dimensional effective semiconductor versus two-dimensional donor/acceptor model (2012)

Felix Florian Stelzl and Uli Würfel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-24

Description: Author(s): Felix Florian Stelzl and Uli Würfel This work reports on two different approaches to simulate bulk-heterojunction organic solar cells (BHJ OSCs). The first is a one-dimensional (1D) description which is based on one effective semiconductor and the second is a two-dimensional model (2D) explicitly taking into account both the donor and... [Phys. Rev. B 86, 075315] Published Thu Aug 23, 2012

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Band gap of wurtzite GaAs: A resonant Raman study (2012)

Patryk Kusch, Steffen Breuer, Manfred Ramsteiner, Lutz Geelhaar, Henning Riechert, and Stephanie Reich

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-25

Description: Author(s): Patryk Kusch, Steffen Breuer, Manfred Ramsteiner, Lutz Geelhaar, Henning Riechert, and Stephanie Reich We report resonant Raman scattering (RRS) by the TO, LO, and 2 LO modes of single wurtzite and zinc-blende GaAs nanowires. The optical band gap of wurtzite GaAs is 1.460 eV±3 meV at room temperature, and 35±3 meV larger than the GaAs zinc-blende band gap. Raman measurements using incoming light pola... [Phys. Rev. B 86, 075317] Published Fri Aug 24, 2012

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Residual disorder and diffusion in thin Heusler alloy films (2012)

B. Jenichen, J. Herfort, T. Hentschel, A. Nikulin, X. Kong, A. Trampert, and I. Žižak

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-30

Description: Author(s): B. Jenichen, J. Herfort, T. Hentschel, A. Nikulin, X. Kong, A. Trampert, and I. Žižak Co 2 FeSi/GaAs(110) and Co 2 FeSi/GaAs(111)B hybrid structures were grown by molecular-beam epitaxy and characterized by transmission electron microscopy (TEM) and x-ray diffraction. The films contained inhomogeneous distributions of ordered L 2 1 and B 2 phases. The average stoichiometry was controlled by... [Phys. Rev. B 86, 075319] Published Wed Aug 29, 2012

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Energetics and approximate quasiparticle electronic structure of low-index surfaces of SnO_{2} (2012)

Sebastian Küfner, André Schleife, Benjamin Höffling, and Friedhelm Bechstedt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-30

Description: Author(s): Sebastian Küfner, André Schleife, Benjamin Höffling, and Friedhelm Bechstedt The geometry and energetics of the unreconstructed tin- and oxygen-terminated (100), (010), and (110) surfaces, the tin-terminated (111) surface, and the stoichiometric (001) surface of rutile-SnO 2 are investigated. Total energies and relaxed atomic geometries are calculated within density functiona... [Phys. Rev. B 86, 075320] Published Wed Aug 29, 2012

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Imaging backscattering through impurity-induced antidots in quantum Hall constrictions (2012)

Nicola Paradiso, Stefan Heun, Stefano Roddaro, Giorgio Biasiol, Lucia Sorba, Davide Venturelli, Fabio Taddei, Vittorio Giovannetti, and Fabio Beltram

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-31

Description: Author(s): Nicola Paradiso, Stefan Heun, Stefano Roddaro, Giorgio Biasiol, Lucia Sorba, Davide Venturelli, Fabio Taddei, Vittorio Giovannetti, and Fabio Beltram We exploit the biased tip of a scanning gate microscope to induce a controlled backscattering between counterpropagating edge channels in a wide constriction in the quantum Hall regime. We compare our detailed conductance maps with a numerical percolation model and demonstrate that conductance fluct... [Phys. Rev. B 86, 085326] Published Thu Aug 30, 2012

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Extraction of the homogeneous linewidth of the spectrally diffusing line of a CdSe/ZnSe quantum dot embedded in a nanowire (2012)

S. Bounouar, A. Trichet, M. Elouneg-Jamroz, R. André, E. Bellet-Amalric, C. Bougerol, M. Den Hertog, K. Kheng, S. Tatarenko, and J.-Ph. Poizat

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-31

Description: Author(s): S. Bounouar, A. Trichet, M. Elouneg-Jamroz, R. André, E. Bellet-Amalric, C. Bougerol, M. Den Hertog, K. Kheng, S. Tatarenko, and J.-Ph. Poizat We present a simple method to extract the homogeneous linewidth of a single photon emitter line exhibiting fast (down to 1 ns) spectral diffusion (SD). It is based on a recently developed technique using photon correlation measurements on half of the line. Here we show that the SD induced bunching d... [Phys. Rev. B 86, 085325] Published Thu Aug 30, 2012

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Large insulating gap in topological insulators induced by negative spin-orbit splitting (2012)

Julien Vidal, Xiuwen Zhang, Vladan Stevanović, Jun-Wei Luo, and Alex Zunger

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-25

Description: Author(s): Julien Vidal, Xiuwen Zhang, Vladan Stevanović, Jun-Wei Luo, and Alex Zunger In a cubic topological insulator (TI), there is a band inversion whereby the s -like Γ 6c conduction band is below the p -like Γ 7v + Γ 8v valence bands by the “inversion energy” Δ i 〈0. In TIs based on the zinc-blende structure such as HgTe, the Fermi energy intersects the degenerate Γ 8v state so the ins... [Phys. Rev. B 86, 075316] Published Fri Aug 24, 2012

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Nonlinear response in overlapping and separated Landau levels of GaAs quantum wells (2012)

A. T. Hatke, M. A. Zudov, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-29

Description: Author(s): A. T. Hatke, M. A. Zudov, L. N. Pfeiffer, and K. W. West We have studied magnetotransport properties of a high-mobility two-dimensional electron system subject to weak electric fields. At low magnetic field B , the differential resistivity acquires a correction δ r ∝− λ 2 j 2 / B 2 , where λ is the Dingle factor and j is the current density, in agreement with theore... [Phys. Rev. B 86, 081307] Published Tue Aug 28, 2012

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Nonlocal noise cross correlation mediated by entangled Majorana fermions (2012)

Hai-Feng Lü, Hai-Zhou Lu, and Shun-Qing Shen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-28

Description: Author(s): Hai-Feng Lü, Hai-Zhou Lu, and Shun-Qing Shen Due to their nonlocality, qubits nested in Majorana bound states may be the key to realize decoherence-free quantum computation. Majorana bound states could be achieved at the ends of a one-dimensional topological superconductor. However, when the bound states couple directly to electron reservoirs ... [Phys. Rev. B 86, 075318] Published Mon Aug 27, 2012

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