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Quantum Hall effect in monolayer-bilayer graphene planar junctions (2013)

Jifa Tian, Yongjin Jiang, Isaac Childres, Helin Cao, Jiangping Hu, and Yong P. Chen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-07

Description: Author(s): Jifa Tian, Yongjin Jiang, Isaac Childres, Helin Cao, Jiangping Hu, and Yong P. Chen The Hall resistance of a homogeneous electron system is well known to be antisymmetric with respect to the magnetic field and the sign of charge carriers. We have observed that such symmetries no longer hold in planar hybrid structures consisting of partly single layer graphene (SLG) and partly bila... [Phys. Rev. B 88, 125410] Published Fri Sep 06, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Electronic ISSN: 1095-3795

Topics: Physics

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Zeeman coupling and screening corrections to skyrmion excitations in graphene (2013)

Wenchen Luo and R. Côté

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-12

Description: Author(s): Wenchen Luo and R. Côté At half-filling of the fourfold degenerate Landau levels | n |≥1 in graphene, the ground states are spin-polarized quantum Hall states that support spin skyrmion excitations for | n |=1,2,3. Working in the Hartree-Fock approximation, we compute the excitation energy of an unbound spin skyrmion-antiskyrm... [Phys. Rev. B 88, 115417] Published Wed Sep 11, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Flexural mode of graphene on a substrate (2013)

Bruno Amorim and Francisco Guinea

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-12

Description: Author(s): Bruno Amorim and Francisco Guinea Out of plane vibrations are suppressed in graphene layers placed on a substrate. These vibrations, in suspended samples, are relevant for the understanding of properties such as the electrical resistivity, the thermal expansion coefficient, and others. We use a general framework to study the propert... [Phys. Rev. B 88, 115418] Published Wed Sep 11, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Mode conversion and long-lived vibrational modes in lead monolayers on silicon (111) after femtosecond laser excitation: A molecular dynamics simulation (2013)

Sung Sakong, Peter Kratzer, Simone Wall, Annika Kalus, and Michael Horn-von Hoegen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-12

Description: Author(s): Sung Sakong, Peter Kratzer, Simone Wall, Annika Kalus, and Michael Horn-von Hoegen The dynamics of vibrations localized in a monolayer of Pb on Si(111) is studied using density functional theory and molecular dynamics methods. Recently, a pump-probe experiment has given direct access to the relaxation dynamics of the vibrational excitations in Pb, revealing two distinct time scale... [Phys. Rev. B 88, 115419] Published Wed Sep 11, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Dielectric screening and plasmons in AA-stacked bilayer graphene (2013)

Rafael Roldán and Luis Brey

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-14

Description: Author(s): Rafael Roldán and Luis Brey The screening properties and collective excitations (plasmons) in AA-stacked bilayer graphene are studied within the random phase approximation. Whereas long-lived plasmons in single-layer graphene and in AB-stacked bilayer graphene can exist only in doped samples, we find that coherent plasmons can... [Phys. Rev. B 88, 115420] Published Fri Sep 13, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Combined effect of strain and defects on the conductance of graphene nanoribbons (2013)

Thomas Lehmann, Dmitry A. Ryndyk, and Gianaurelio Cuniberti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-17

Description: Author(s): Thomas Lehmann, Dmitry A. Ryndyk, and Gianaurelio Cuniberti We investigate the combined influence of structural defects and uniaxial longitudinal strain on the electronic transport properties of armchair graphene nanoribbons using the numerical approach based on the semiempirical tight-binding model, the Landauer formalism, and the recursion method for Green... [Phys. Rev. B 88, 125420] Published Mon Sep 16, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Bulk-boundary correspondence for chiral symmetric quantum walks (2013)

János K. Asbóth and Hideaki Obuse

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-18

Description: Author(s): János K. Asbóth and Hideaki Obuse Discrete-time quantum walks (DTQW) have topological phases that are richer than those of time-independent lattice Hamiltonians. Even the basic symmetries, on which the standard classification of topological insulators hinges, have not yet been properly defined for quantum walks. We introduce the key... [Phys. Rev. B 88, 121406] Published Tue Sep 17, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Nanoscopic interferometer model for spin resonance in current noise (2013)

Anatoly Golub and Baruch Horovitz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-18

Description: Author(s): Anatoly Golub and Baruch Horovitz We study a model for the observed phenomenon of electron spin resonance (ESR) at the Zeeman frequency as seen by a scanning tunneling microscope (STM) via its current noise. The model for this ESR-STM phenomenon allows the STM current to flow in two arms of a nanoscopic interferometer, one arm has d... [Phys. Rev. B 88, 115423] Published Tue Sep 17, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Fine structure of light-hole excitons in nanowire quantum dots (2013)

M. Zieliński

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-19

Description: Author(s): M. Zieliński Quantum dots with light-hole ground states could find numerous applications including faster quantum bit operations or coherent conversion of photons into electron spins. Typically, however, holes confined in epitaxial quantum dots are of heavy-hole character. I show, by use of atomistic tight-bindi... [Phys. Rev. B 88, 115424] Published Wed Sep 18, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Eigenfrequencies of the randomly pinned drum and conductivity of graphene (2013)

M. V. Medvedyeva and Ya. M. Blanter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-19

Description: Author(s): M. V. Medvedyeva and Ya. M. Blanter Graphene is a convenient material for nanomechanical applications since high-frequency oscillations are easily accessible. In this article, we consider graphene on a rough substrate attached to imperfections at random locations. We explore the statistics of low-lying phonon modes, which exert most i... [Phys. Rev. B 88, 125423] Published Wed Sep 18, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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