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Nanometer-scale monitoring of quantum-confined Stark effect and emission efficiency droop in multiple GaN/AlN quantum disks in nanowires (2016)

L. F. Zagonel, L. H. G. Tizei, G. Z. Vitiello, G. Jacopin, L. Rigutti, M. Tchernycheva, F. H. Julien, R. Songmuang, T. Ostasevicius, F. de la Peña, C. Ducati, P. A. Midgley, and M. Kociak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-05-07

Beschreibung: Author(s): L. F. Zagonel, L. H. G. Tizei, G. Z. Vitiello, G. Jacopin, L. Rigutti, M. Tchernycheva, F. H. Julien, R. Songmuang, T. Ostasevicius, F. de la Peña, C. Ducati, P. A. Midgley, and M. Kociak We report on a detailed study of the intensity dependent optical properties of individual GaN/AlN quantum disks (QDisks) embedded into GaN nanowires (NW). The structural and optical properties of the QDisks were probed by high spatial resolution cathodoluminescence (CL) in a scanning transmission el… [Phys. Rev. B 93, 205410] Published Fri May 06, 2016

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

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Terahertz ratchet effects in graphene with a lateral superlattice (2016)

P. Olbrich, J. Kamann, M. König, J. Munzert, L. Tutsch, J. Eroms, D. Weiss, Ming-Hao Liu (劉明豪), L. E. Golub, E. L. Ivchenko, V. V. Popov, D. V. Fateev, K. V. Mashinsky, F. Fromm, Th. Seyller, and S. D. Ganichev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-02-13

Beschreibung: Author(s): P. Olbrich, J. Kamann, M. König, J. Munzert, L. Tutsch, J. Eroms, D. Weiss, Ming-Hao Liu (劉明豪), L. E. Golub, E. L. Ivchenko, V. V. Popov, D. V. Fateev, K. V. Mashinsky, F. Fromm, Th. Seyller, and S. D. Ganichev This paper reports on the experimental realization of ratchet effects in graphene, excited by alternating electric fields of terahertz frequency range. Such ratchet effects were previously seen in semiconductors. Two types of graphene lateral superlattices are studied: epitaxially grown and exfoliated graphene with an asymmetric lateral periodic potential. Laser radiation shining on the modulated devices results in the excitation of a direct electric current being sensitive to the radiation’s polarization state. This ratchet current consists of a few linearly independent contributions including the Seebeck thermoratchet effect as well as “linear” and “circular” ratchets. The results are analyzed with a theoretical model. Further development of the theory is required for a quantitative analysis. [Phys. Rev. B 93, 075422] Published Fri Feb 12, 2016

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Identification of ${\mathrm{Ni}}_{2}\mathrm{C}$ electronic states in graphene-Ni(111) growth through resonant and dichroic angle-resolved photoemission at the C $K$-edge (2017)

G. Drera, C. Cepek, L. L. Patera, F. Bondino, E. Magnano, S. Nappini, C. Africh, A. Lodi-Rizzini, N. Joshi, P. Ghosh, A. Barla, S. K. Mahatha, S. Pagliara, A. Giampietri, C. Pintossi, and L. Sangaletti

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-10-31

Beschreibung: Author(s): G. Drera, C. Cepek, L. L. Patera, F. Bondino, E. Magnano, S. Nappini, C. Africh, A. Lodi-Rizzini, N. Joshi, P. Ghosh, A. Barla, S. K. Mahatha, S. Pagliara, A. Giampietri, C. Pintossi, and L. Sangaletti The graphene-Ni(111) (GrNi) growth via chemical vapor deposition has been explored by resonant, angle-resolved, and dichroic photoemission spectroscopy (soft x-ray Res-ARPES) in order to identify the possible contributions to the electronic structure deriving from different phases that can coexist i... [Phys. Rev. B 96, 165442] Published Mon Oct 30, 2017

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Intersubband scattering in $n$-GaAs/AlGaAs wide quantum wells (2018)

I. L. Drichko, I. Yu. Smirnov, M. O. Nestoklon, A. V. Suslov, D. Kamburov, K. W. Baldwin, L. N. Pfeiffer, K. W. West, and L. E. Golub

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2018-02-21

Beschreibung: Author(s): I. L. Drichko, I. Yu. Smirnov, M. O. Nestoklon, A. V. Suslov, D. Kamburov, K. W. Baldwin, L. N. Pfeiffer, K. W. West, and L. E. Golub Slow magneto-oscilations of the conductivity are observed in a 75-nm-wide quantum well at heating of the two-dimensional electrons by a high-intensity surface acoustic wave. These magneto-oscillations are caused by intersubband elastic scattering between the symmetric and asymmetric subbands formed ... [Phys. Rev. B 97, 075427] Published Tue Feb 20, 2018

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Spin properties of dense near-surface ensembles of nitrogen-vacancy centers in diamond (2018)

J.-P. Tetienne, R. W. de Gille, D. A. Broadway, T. Teraji, S. E. Lillie, J. M. McCoey, N. Dontschuk, L. T. Hall, A. Stacey, D. A. Simpson, and L. C. L. Hollenberg

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2018-02-03

Beschreibung: Author(s): J.-P. Tetienne, R. W. de Gille, D. A. Broadway, T. Teraji, S. E. Lillie, J. M. McCoey, N. Dontschuk, L. T. Hall, A. Stacey, D. A. Simpson, and L. C. L. Hollenberg We present a study of the spin properties of dense layers of near-surface nitrogen-vacancy (NV) centers in diamond created by nitrogen ion implantation. The optically detected magnetic resonance contrast and linewidth, spin coherence time, and spin relaxation time, are measured as a function of impl... [Phys. Rev. B 97, 085402] Published Fri Feb 02, 2018

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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All-electrical generation of spin-polarized currents in quantum spin Hall insulators (2017)

L. L. Tao, K. T. Cheung, L. Zhang, and J. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-03-25

Beschreibung: Author(s): L. L. Tao, K. T. Cheung, L. Zhang, and J. Wang The control and generation of spin-polarized current (SPC) without magnetic materials and an external magnetic field is a big challenge in spintronics and normally requires a spin-flip mechanism. In this Rapid Communication, we show the theoretical discovery of all-electrical generation of SPC witho… [Phys. Rev. B 95, 121407(R)] Published Fri Mar 24, 2017

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Metastable electron-electron states in double-layer graphene structures (2015)

L. L. Marnham and A. V. Shytov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): L. L. Marnham and A. V. Shytov The prototypical exciton model of two interacting Dirac particles in graphene was analyzed in J. Sabio et al. , Phys. Rev. B 81 , 045428 (2010) and it was found that in one of the electron-hole scattering channels the total kinetic energy vanishes, resulting in a singular behavior. We show that this … [Phys. Rev. B 92, 085409] Published Fri Aug 07, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Electrical control of the sign of the g factor in a GaAs hole quantum point contact (2016)

A. Srinivasan, K. L. Hudson, D. Miserev, L. A. Yeoh, O. Klochan, K. Muraki, Y. Hirayama, O. P. Sushkov, and A. R. Hamilton

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-07-19

Beschreibung: Author(s): A. Srinivasan, K. L. Hudson, D. Miserev, L. A. Yeoh, O. Klochan, K. Muraki, Y. Hirayama, O. P. Sushkov, and A. R. Hamilton Zeeman splitting of one-dimensional hole subbands is investigated in quantum point contacts fabricated on a (311)-oriented GaAs-AlGaAs heterostructure. Transport measurements can determine the magnitude of the g factor, but cannot usually determine the sign. Here we use a combination of tilted field… [Phys. Rev. B 94, 041406(R)] Published Mon Jul 18, 2016

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Nonlinear optical spectroscopy of indirect excitons in coupled quantum wells (2015)

P. Andreakou, S. Cronenberger, D. Scalbert, A. Nalitov, N. A. Gippius, A. V. Kavokin, M. Nawrocki, J. R. Leonard, L. V. Butov, K. L. Campman, A. C. Gossard, and M. Vladimirova

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-03-31

Beschreibung: Author(s): P. Andreakou, S. Cronenberger, D. Scalbert, A. Nalitov, N. A. Gippius, A. V. Kavokin, M. Nawrocki, J. R. Leonard, L. V. Butov, K. L. Campman, A. C. Gossard, and M. Vladimirova Indirect excitons in coupled quantum wells are long-living quasiparticles, explored in the studies of collective quantum states. We demonstrate that, despite the extremely low oscillator strength, their spin and population dynamics can by addressed by time-resolved pump-probe spectroscopy. Our exper... [Phys. Rev. B 91, 125437] Published Mon Mar 30, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Critical radius and temperature for buckling in graphene (2016)

L. L. Bonilla and M. Ruiz-Garcia

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2016-03-08

Beschreibung: Author(s): L. L. Bonilla and M. Ruiz-Garcia In this work, we find an analytical flat-membrane solution to the saddle point equations, derived by F. Guinea et al. [ Phys. Rev. B 89 , 125428 (2014) ], for the case of a suspended graphene membrane of circular shape. We also find how different buckled membrane solutions bifurcate from the flat membr… [Phys. Rev. B 93, 115407] Published Tue Mar 08, 2016

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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