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Electronic and structural characterization of divacancies in irradiated graphene (2012)

Miguel M. Ugeda, Iván Brihuega, Fanny Hiebel, Pierre Mallet, Jean-Yves Veuillen, José M. Gómez-Rodríguez, and Félix Ynduráin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-09

Description: Author(s): Miguel M. Ugeda, Iván Brihuega, Fanny Hiebel, Pierre Mallet, Jean-Yves Veuillen, José M. Gómez-Rodríguez, and Félix Ynduráin We provide a thorough study of a carbon divacancy, a point defect expected to have a large impact on the properties of graphene. Low-temperature scanning tunneling microscopy imaging of irradiated graphene on different substrates enabled us to identify a common twofold symmetry point defect. Our fir... [Phys. Rev. B 85, 121402] Published Thu Mar 08, 2012

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Graphing and grafting graphene: Classifying finite topological defects (2012)

Eric Cockayne

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-09

Description: Author(s): Eric Cockayne The structure of finite-area topological defects in graphene is described in terms of both the direct honeycomb lattice and its dual triangular lattice. Such defects are equivalent to cutting out a patch of graphene and replacing it with a different patch with the same number of dangling bonds. An i... [Phys. Rev. B 85, 125409] Published Thu Mar 08, 2012

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Optimized confinement of fermions in two dimensions (2012)

J. D. Cone, S. Chiesa, V. R. Rousseau, G. G. Batrouni, and R. T. Scalettar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): J. D. Cone, S. Chiesa, V. R. Rousseau, G. G. Batrouni, and R. T. Scalettar One of the challenging features of studying model Hamiltonians with cold atoms in optical lattices is the presence of spatial inhomogeneities induced by the confining potential, which results in the coexistence of different phases.This paper presents quantum Monte Carlo results comparing methods for... [Phys. Rev. B 85, 075418] Published Tue Feb 21, 2012

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Near-field spectroscopy of silicon dioxide thin films (2012)

L. M. Zhang, G. O. Andreev, Z. Fei, A. S. McLeod, G. Dominguez, M. Thiemens, A. H. Castro-Neto, D. N. Basov, and M. M. Fogler

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): L. M. Zhang, G. O. Andreev, Z. Fei, A. S. McLeod, G. Dominguez, M. Thiemens, A. H. Castro-Neto, D. N. Basov, and M. M. Fogler We analyze the results of scanning near-field infrared spectroscopy performed on thin films of a-SiO 2 on Si substrate. The measured near-field signal exhibits surface-phonon resonances whose strength has a prominent thickness dependence in the range from 2 to 300 nm . These observations are compared ... [Phys. Rev. B 85, 075419] Published Tue Feb 21, 2012

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Surface plasmon enhanced absorption and suppressed transmission in periodic arrays of graphene ribbons (2012)

A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno Resonance diffraction in the periodic array of graphene microribbons is theoretically studied following a recent experiment [ L. Ju et al. Nature Nanotech. 6 630 (2011) ]. Systematic studies over a wide range of parameters are presented. It is shown that a much richer resonant picture would be obser... [Phys. Rev. B 85, 081405] Published Tue Feb 21, 2012

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Multiparticle pseudopotentials for multicomponent quantum Hall systems (2012)

Simon C. Davenport and Steven H. Simon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-25

Description: Author(s): Simon C. Davenport and Steven H. Simon The Haldane pseudopotential construction has been an extremely powerful concept in quantum Hall physics—it not only gives a minimal description of the space of Hamiltonians but also suggests special model Hamiltonians (those where certain pseudopotential are set to zero) that may have exactly solvab... [Phys. Rev. B 85, 075430] Published Fri Feb 24, 2012

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Multiphonon relaxation of moderately excited carriers in Si/SiO_{2} nanocrystals (2012)

A. S. Moskalenko, J. Berakdar, A. N. Poddubny, A. A. Prokofiev, I. N. Yassievich, and S. V. Goupalov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-25

Description: Author(s): A. S. Moskalenko, J. Berakdar, A. N. Poddubny, A. A. Prokofiev, I. N. Yassievich, and S. V. Goupalov We study the phonon-assisted intraband relaxation of electrons and holes confined in Si nanocrystals. The rates of relaxation processes are calculated as functions of the nanocrystal size and of the temperature. It occurs that the main contribution to the relaxation is provided by the mechanism wher... [Phys. Rev. B 85, 085432] Published Fri Feb 24, 2012

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First-principles theoretical investigation of monoatomic and dimer Mn adsorption on noble metal (111) surfaces (2012)

Francisco Muñoz, Aldo H. Romero, Jose Mejía-López, and J. L. Morán-López

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Francisco Muñoz, Aldo H. Romero, Jose Mejía-López, and J. L. Morán-López A theoretical investigation of the adsorption of Mn single atoms and dimers on the (111) surface of Cu, Ag, and Au, within the framework of the density functional theory, is presented. First, the bulk and the clean (111) surface electronic structures are calculated, with results that agree well with... [Phys. Rev. B 85, 115417] Published Mon Mar 12, 2012

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Optical phonon modes in ordered core-shell CdSe/CdS nanorod arrays (2012)

Andrea Giugni, Gobind Das, Alessandro Alabastri, Remo Proietti Zaccaria, Marco Zanella, Isabella Franchini, Enzo Di Fabrizio, and Roman Krahne

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Andrea Giugni, Gobind Das, Alessandro Alabastri, Remo Proietti Zaccaria, Marco Zanella, Isabella Franchini, Enzo Di Fabrizio, and Roman Krahne We investigate the optical phonons in “dot-in-a-rod” core–shell CdSe/CdS nanorods at wavelengths resonant with the optical transitions either in the core or in the shell. At a wavelength above the CdS band gap, only CdS phonon modes were detected. In contrast, at excitation in resonance with the cor... [Phys. Rev. B 85, 115413] Published Mon Mar 12, 2012

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

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Magnetophonon resonance in graphite: High-field Raman measurements and electron-phonon coupling contributions (2012)

Y. Kim, Y. Ma, A. Imambekov, N. G. Kalugin, A. Lombardo, A. C. Ferrari, J. Kono, and D. Smirnov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Y. Kim, Y. Ma, A. Imambekov, N. G. Kalugin, A. Lombardo, A. C. Ferrari, J. Kono, and D. Smirnov We perform Raman scattering experiments on natural graphite in magnetic fields up to 45 T, observing a series of peaks due to interband electronic excitations over a much broader magnetic field range than previously reported. We also explore electron-phonon coupling in graphite via magnetophonon res... [Phys. Rev. B 85, 121403] Published Mon Mar 12, 2012

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Charge fluctuations in single-electron tunneling oscillations (2012)

C. Negri and F. Pistolesi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): C. Negri and F. Pistolesi It has been predicted that in the presence of a sufficiently high dissipative environment transport in a small tunnel junction can become extremely regular, giving rise to the phenomenon of single-electron tunneling oscillations. Recent progress in detection of high-frequency current fluctuations an... [Phys. Rev. B 85, 115416] Published Mon Mar 12, 2012

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Smooth gauge for topological insulators (2012)

Alexey A. Soluyanov and David Vanderbilt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Alexey A. Soluyanov and David Vanderbilt We develop a technique for constructing Bloch-like functions for 2D Z 2 insulators (i.e., quantum spin-Hall insulators) that are smooth functions of k on the entire Brillouin-zone torus. As the initial step, the occupied subspace of the insulator is decomposed into a direct sum of two “Chern bands,” ... [Phys. Rev. B 85, 115415] Published Mon Mar 12, 2012

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Surface properties of the clean and Au/Pd covered Fe_{3}O_{4}(111): DFT andDFT+U study (2012)

Adam Kiejna, Tomasz Ossowski, and Tomasz Pabisiak

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-14

Description: Author(s): Adam Kiejna, Tomasz Ossowski, and Tomasz Pabisiak The spin-density-functional theory (DFT) and DFT+ U with the Hubbard U term accounting for on-site Coulomb interactions were applied to investigate structure, stability, and electronic properties of different terminations of the Fe 3 O 4 (111) surface. All terminations of the ferrimagnetic Fe 3 O 4 (111) sur... [Phys. Rev. B 85, 125414] Published Tue Mar 13, 2012

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Symmetry classification of energy bands in graphene (2012)

E. Kogan and V. U. Nazarov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): E. Kogan and V. U. Nazarov We present the results of the first-principle calculations of the energy bands in graphene and their symmetry classification. The valence bands and four lowest conduction bands are classified according to their symmetry at points Γ and K . Merging of the bands is interpreted in the framework of the g... [Phys. Rev. B 85, 115418] Published Wed Mar 14, 2012

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Resonant Rayleigh scattering as a probe of spin polarization in a two-dimensional electron system (2012)

L. V. Kulik, K. Ovchinnikov, A. S. Zhuravlev, V. E. Bisti, I. V. Kukushkin, S. Schmult, and W. Dietsche

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): L. V. Kulik, K. Ovchinnikov, A. S. Zhuravlev, V. E. Bisti, I. V. Kukushkin, S. Schmult, and W. Dietsche We investigated the resonant Rayleigh scattering in a two-dimensional electron system (2DES) and developed a differential technique for obtaining high-quality RRS spectra. Oscillations of the RRS scattering efficiency are observed. The oscillations are explained in terms of redistribution of electro... [Phys. Rev. B 85, 113403] Published Wed Mar 14, 2012

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Birefringent nanostructured composite materials (2012)

Bernardo S. Mendoza and W. Luis Mochán

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): Bernardo S. Mendoza and W. Luis Mochán We use a very efficient recursive method to calculate the effective optical response of materials made up of arbitrarily shaped dielectric inclusions arranged in periodic 2D arrays within a metal matrix with a lattice constant much smaller than the wavelength of the incident light, so that we may ne... [Phys. Rev. B 85, 125418] Published Wed Mar 14, 2012

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Direct experimental determination of the K 2p and Cl 2p core-level binding energy shifts between molecular and solid KCl: Line broadening effects (2012)

M. Patanen, G. M. Bancroft, S. Aksela, and H. Aksela

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): M. Patanen, G. M. Bancroft, S. Aksela, and H. Aksela Using a technique used previously for metals, the K 2 p and Cl 2 p photoelectron spectra of KCl have been measured from the molecular vapor and nonconductor solid simultaneously —a direct measurement for a nonconductor. The Cl 2 p core level in bulk-solid KCl has a 0.79-eV larger binding energy than its... [Phys. Rev. B 85, 125419] Published Wed Mar 14, 2012

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Electron localization in epitaxial graphene on Ru(0001) determined by moiré corrugation (2012)

D. Stradi, S. Barja, C. Díaz, M. Garnica, B. Borca, J. J. Hinarejos, D. Sánchez-Portal, M. Alcamí, A. Arnau, A. L. Vázquez de Parga, R. Miranda, and F. Martín

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): D. Stradi, S. Barja, C. Díaz, M. Garnica, B. Borca, J. J. Hinarejos, D. Sánchez-Portal, M. Alcamí, A. Arnau, A. L. Vázquez de Parga, R. Miranda, and F. Martín The interpretation of scanning tunneling spectroscopy (STS) and scanning tunneling microscopy measurements of epitaxial graphene on lattice-mismatched substrates is a challenging problem, because of the spatial modulation in the electronic structure imposed by the formation of a moiré pattern. Here ... [Phys. Rev. B 85, 121404] Published Wed Mar 14, 2012

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Growth and decay of hcp-like Cu hut-shaped structures on W(100) (2012)

Tjeerd R. J. Bollmann, Raoul van Gastel, Herbert Wormeester, Harold J. W. Zandvliet, and Bene Poelsema

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): Tjeerd R. J. Bollmann, Raoul van Gastel, Herbert Wormeester, Harold J. W. Zandvliet, and Bene Poelsema We have studied both the morphology and structure of thin Cu deposits on W(100) during growth and desorption, using low-energy electron microscopy (LEEM) and selective area low-energy electron diffraction ( μ LEED). During growth at 674 K hut-shaped Cu crystallites with steep facets ( 〉 54 ∘ ) coexist... [Phys. Rev. B 85, 125417] Published Wed Mar 14, 2012

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Finite-length charge-density waves on terminated atomic wires (2012)

Jin Sung Shin, Kyung-Deuk Ryang, and Han Woong Yeom

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-05

Description: Author(s): Jin Sung Shin, Kyung-Deuk Ryang, and Han Woong Yeom Finite-size effects in charge-density waves (CDWs) were unveiled using scanning tunneling microscopy for metallic atomic wires on the Au/Si(553) surface, as terminated by adsorbate impurities. We found that CDW formed at low temperature adopts the finite-length boundary condition in two distinct way... [Phys. Rev. B 85, 073401] Published Fri Feb 03, 2012

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Large enhancement of thermoelectric effects in a double quantum dot system due to interference and Coulomb correlation phenomena (2012)

Piotr Trocha and Józef Barnaś

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-05

Description: Author(s): Piotr Trocha and Józef Barnaś Thermoelectric effects in a double quantum dot system coupled to external magnetic/nonmagnetic leads are investigated theoretically. The basic thermoelectric transport characteristics, like thermopower, electronic contribution to heat conductance, and the corresponding figure of merit, have been cal... [Phys. Rev. B 85, 085408] Published Fri Feb 03, 2012

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Spin-selective transport through helical molecular systems (2012)

R. Gutierrez, E. Díaz, R. Naaman, and G. Cuniberti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-17

Description: Author(s): R. Gutierrez, E. Díaz, R. Naaman, and G. Cuniberti Highly spin-selective transport of electrons through a helically shaped electrostatic potential is demonstrated in the frame of a minimal model approach. The effect is significant even for weak spin-orbit coupling. Two main factors determine the selectivity: an unconventional Rashba-like spin-orbit ... [Phys. Rev. B 85, 081404] Published Thu Feb 16, 2012

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Adsorbate-induced reconstruction by C_{60} on close-packed metal surfaces: Mechanism for different types of reconstruction (2012)

Xing-Qiang Shi, Michel A. Van Hove, and Rui-Qin Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): Xing-Qiang Shi, Michel A. Van Hove, and Rui-Qin Zhang Recent studies reveal that reconstruction of close-packed metal surfaces induced by C 60 adsorption is the rule rather than the exception. Two types of reconstruction are reported for C 60 on different surfaces: (1) C 60 sinks into a 7-atom hole, such as on Cu(111); and (2) C 60 sits over a 1-atom hole,... [Phys. Rev. B 85, 075421] Published Tue Feb 21, 2012

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Designer reflectors using spoof surface plasmons in the terahertz range (2012)

Jingbo Liu, Rajind Mendis, and Daniel M. Mittleman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: Author(s): Jingbo Liu, Rajind Mendis, and Daniel M. Mittleman We show that spoof surface plasmons can be used to control the reflection of terahertz radiation at the output facet of a parallel-plate waveguide. Using a periodic groove pattern on the output face, reflectivity approaching 100% can be achieved within a limited spectral range. Unlike the convention... [Phys. Rev. B 86, 241405] Published Fri Dec 21, 2012

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Potential energy surface for graphene on graphene: Ab initio derivation, analytical description, and microscopic interpretation (2012)

M. Reguzzoni, A. Fasolino, E. Molinari, and M. C. Righi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-28

Description: Author(s): M. Reguzzoni, A. Fasolino, E. Molinari, and M. C. Righi We derive an analytical expression that describes the interaction energy between two graphene layers identically oriented as a function of the relative lateral and vertical positions, in excellent agreement with first principles calculations. Thanks to its formal simplicity, the proposed model allow... [Phys. Rev. B 86, 245434] Published Thu Dec 27, 2012

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Leggett-Garg inequality in electron interferometers (2012)

Clive Emary, Neill Lambert, and Franco Nori

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-28

Description: Author(s): Clive Emary, Neill Lambert, and Franco Nori We consider the violation of the Leggett-Garg inequality in electronic Mach-Zehnder inteferometers. This setup has two distinct advantages over earlier quantum-transport proposals: Firstly, the required correlation functions can be obtained without time-resolved measurements. Secondly, the geometry ... [Phys. Rev. B 86, 235447] Published Thu Dec 27, 2012

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Symmetry-dependent transport properties and bipolar spin filtering in zigzag α-graphyne nanoribbons (2012)

Qu Yue, Shengli Chang, Jichun Tan, Shiqiao Qin, Jun Kang, and Jingbo Li

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Qu Yue, Shengli Chang, Jichun Tan, Shiqiao Qin, Jun Kang, and Jingbo Li First-principles calculations are performed to investigate the transport properties of zigzag α -graphyne nanoribbons (Z α GNRs). It is found that asymmetric Z α GNRs behave as conductors with linear current-voltage relationships, whereas symmetric Z α GNRs have very small currents under finite bias voltag... [Phys. Rev. B 86, 235448] Published Fri Dec 28, 2012

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

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Multiple light-coupling modes of confined excitons observable in photoluminescence spectra of high-quality CuCl thin films (2012)

L. Q. Phuong, M. Ichimiya, H. Ishihara, and M. Ashida

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): L. Q. Phuong, M. Ichimiya, H. Ishihara, and M. Ashida We report the observation of multiple light-coupling modes of excitons confined in CuCl thin films with thicknesses of a few hundred nanometers beyond the long-wavelength approximation in photoluminescence spectra. Due to a remarkably long coupling length between light and multinode-type excitons re... [Phys. Rev. B 86, 235449] Published Fri Dec 28, 2012

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Ab initio many-body study of cobalt adatoms adsorbed on graphene (2012)

Yudistira Virgus, Wirawan Purwanto, Henry Krakauer, and Shiwei Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Yudistira Virgus, Wirawan Purwanto, Henry Krakauer, and Shiwei Zhang Many recent calculations have been performed to study a Co atom adsorbed on graphene, with significantly varying results on the nature of the bonding. We use the auxiliary-field quantum Monte Carlo method and a size-correction embedding scheme to accurately calculate the binding energy of Co on grap... [Phys. Rev. B 86, 241406] Published Fri Dec 28, 2012

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Objective quasicontinuum approach for rod problems (2012)

Ye. Hakobyan, E. B. Tadmor, and R. D. James

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Ye. Hakobyan, E. B. Tadmor, and R. D. James An objective quasicontinuum (OQC) method is developed for simulating rodlike systems that can be represented as a combination of locally objective structures. An objective structure (OS) is one for which a group of atoms, called a “fundamental domain” (FD), is repeated using specific rules of transl... [Phys. Rev. B 86, 245435] Published Fri Dec 28, 2012

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Finite-size energy gap in weak and strong topological insulators (2012)

Ken-Ichiro Imura, Mayuko Okamoto, Yukinori Yoshimura, Yositake Takane, and Tomi Ohtsuki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Ken-Ichiro Imura, Mayuko Okamoto, Yukinori Yoshimura, Yositake Takane, and Tomi Ohtsuki The nontrivialness of a topological insulator (TI) is characterized either by a bulk topological invariant or by the existence of a protected metallic surface state. Yet, in realistic samples of finite size, this nontrivialness does not necessarily guarantee the gaplessness of the surface state. Dep... [Phys. Rev. B 86, 245436] Published Fri Dec 28, 2012

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Magnetic properties of O_{2} adsorbed on Cu(100): A spin-polarized metastable He beam study (2012)

M. Kurahashi, X. Sun, and Y. Yamauchi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-21

Description: Author(s): M. Kurahashi, X. Sun, and Y. Yamauchi Magnetic properties of O 2 adsorbed on Cu(100) were investigated by monitoring the spin dependence in Penning ionization of metastable He(2 3 S ) under external magnetic fields of 0–5 T. A clear spin polarization was found for the 3 σ g and 1 π u orbitals of physisorbed O 2 under external fields, while the s... [Phys. Rev. B 86, 245421] Published Thu Dec 20, 2012

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Nonlinear damping in graphene resonators (2012)

Alexander Croy, Daniel Midtvedt, Andreas Isacsson, and Jari M. Kinaret

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-21

Description: Author(s): Alexander Croy, Daniel Midtvedt, Andreas Isacsson, and Jari M. Kinaret Based on a continuum mechanical model for single-layer graphene, we propose and analyze a microscopic mechanism for dissipation in nanoelectromechanical graphene resonators. We find that coupling between flexural modes and in-plane phonons leads to linear and nonlinear damping of out-of-plane vibrat... [Phys. Rev. B 86, 235435] Published Thu Dec 20, 2012

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Conventional and acoustic surface plasmons on noble metal surfaces: A time-dependent density functional theory study (2012)

Jun Yan, Karsten W. Jacobsen, and Kristian S. Thygesen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-21

Description: Author(s): Jun Yan, Karsten W. Jacobsen, and Kristian S. Thygesen First-principles calculations of the conventional and acoustic surface plasmons (CSPs and ASPs) on the (111) surfaces of Cu, Ag, and Au are presented. The effect of s - d interband transitions on both types of plasmons is investigated by comparing results from the local density approximation and an or... [Phys. Rev. B 86, 241404] Published Thu Dec 20, 2012

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Structure and zero-dimensional polariton spectrum of natural defects in GaAs/AlAs microcavities (2012)

Joanna M. Zajac and Wolfgang Langbein

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-03

Description: Author(s): Joanna M. Zajac and Wolfgang Langbein We present a correlative study of structural and optical properties of natural defects in planar semiconductor microcavities grown by molecular beam epitaxy, which are showing a localized polariton spectrum as reported in Zajac et al. [ Phys. Rev. B 85 165309 (2012) ]. The three-dimensional spatial ... [Phys. Rev. B 86, 195401] Published Thu Nov 01, 2012

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

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Rippling instabilities in suspended nanoribbons (2012)

Hailong Wang and Moneesh Upmanyu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-08

Description: Author(s): Hailong Wang and Moneesh Upmanyu Morphology mediates the interplay between the structure and electronic transport in atomically thin nanoribbons such as graphene as the relaxation of edge stresses occurs preferentially via out-of-plane deflections. In the case of end-supported suspended nanoribbons that we study here, past experime... [Phys. Rev. B 86, 205411] Published Wed Nov 07, 2012

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Majorana states in inhomogeneous spin ladders (2012)

Fabio L. Pedrocchi, Stefano Chesi, Suhas Gangadharaiah, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-08

Description: Author(s): Fabio L. Pedrocchi, Stefano Chesi, Suhas Gangadharaiah, and Daniel Loss We propose an inhomogeneous open spin ladder, related to the Kitaev honeycomb model, which can be tuned between topological and nontopological phases. In extension of Lieb's theorem, we show numerically that the ground state of the spin ladder is either vortex free or vortex full. We study the robus... [Phys. Rev. B 86, 205412] Published Wed Nov 07, 2012

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Stacking order, interaction, and weak surface magnetism in layered graphene sheets (2012)

Dong-Hui Xu, Jie Yuan, Zi-Jian Yao, Yi Zhou, Jin-Hua Gao, and Fu-Chun Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-08

Description: Author(s): Dong-Hui Xu, Jie Yuan, Zi-Jian Yao, Yi Zhou, Jin-Hua Gao, and Fu-Chun Zhang Recent transport experiments have demonstrated that rhombohedral-stacking trilayer graphene is an insulator with an intrinsic gap of 6 meV and Bernal-stacking trilayer graphene is a metal. We propose a Hubbard model with a moderate U for layered graphene sheets, and show that the model well explains... [Phys. Rev. B 86, 201404] Published Wed Nov 07, 2012

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Channeling of a subangstrom electron beam in a crystal mapped to two-dimensional molecular orbitals (2012)

Robert Hovden, Huolin L. Xin, and David A. Muller

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Robert Hovden, Huolin L. Xin, and David A. Muller The propagation of high-energy electrons in crystals is in general a complicated multiple-scattering problem. However, along high-symmetry zone axes the problem can be mapped to the time evolution of a two-dimensional (2D) molecular system. Each projected atomic column can be approximated by the pot... [Phys. Rev. B 86, 195415] Published Mon Nov 12, 2012

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Theory of zero-bias anomaly in low-temperature inelastic tunneling spectroscopy (2012)

Yoshihiro Asai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Yoshihiro Asai A small zero-bias anomaly (ZBA) in inelastic tunneling spectroscopy (IETS) through nonmagnetic quantum wires has been suggested experimentally at low temperatures. Here, the mechanism is discussed theoretically with special attention paid to contributions from low energy phonons. Our theoretical cal... [Phys. Rev. B 86, 201405] Published Mon Nov 12, 2012

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Excitonic instabilities and insulating states in bilayer graphene (2012)

Kok Wee Song, Yung-Ching Liang, and Stephan Haas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Kok Wee Song, Yung-Ching Liang, and Stephan Haas The competing ground states of bilayer graphene are studied by applying renormalization group techniques to a bilayer honeycomb lattice with nearest neighbor hopping. In the absence of interactions, the Fermi surface of this model at half-filling consists of two nodal points with momenta K , K ′ , wher... [Phys. Rev. B 86, 205418] Published Mon Nov 12, 2012

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Metallic behavior in low-dimensional honeycomb SiB crystals: A first-principles prediction of atomic structure and electronic properties (2012)

Anders Hansson, F. de Brito Mota, and Roberto Rivelino

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-15

Description: Author(s): Anders Hansson, F. de Brito Mota, and Roberto Rivelino We present a detailed analysis of the atomic and electronic structure of a two-dimensional monolayer of boron and silicon elements within periodic density functional theory. The proposed h-SiB sheet is a structural analog of hexagonal boron nitride (h-BN) and exhibits a good structural stability, co... [Phys. Rev. B 86, 195416] Published Wed Nov 14, 2012

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Designer quantum spin Hall phase transition in molecular graphene (2012)

Pouyan Ghaemi, Sarang Gopalakrishnan, and Taylor L. Hughes

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-15

Description: Author(s): Pouyan Ghaemi, Sarang Gopalakrishnan, and Taylor L. Hughes Graphene was the first material predicted to be a time-reversal-invariant topological insulator [ C. L. Kane and E. J. Mele Phys. Rev. Lett. 95 226801 (2005) ]; however, the insulating gap is immeasurably small owing to the weakness of spin-orbit interactions in graphene. A recent experiment [ K. K.... [Phys. Rev. B 86, 201406] Published Wed Nov 14, 2012

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Defect and impurity properties of hexagonal boron nitride: A first-principles calculation (2012)

Bing Huang and Hoonkyung Lee

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-08

Description: Author(s): Bing Huang and Hoonkyung Lee In this paper, we have systematically studied the structural and electronic properties of vacancy defects and carbon impurity in hexagonal boron nitride ( h -BN) by using both normal GGA calculations and advanced hybrid functional calculations. Our calculations show that the defect configurations and ... [Phys. Rev. B 86, 245406] Published Fri Dec 07, 2012

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Spin-dependent Smoluchowski effect (2012)

O. P. Polyakov, M. Corbetta, O. V. Stepanyuk, H. Oka, A. M. Saletsky, D. Sander, V. S. Stepanyuk, and J. Kirschner

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): O. P. Polyakov, M. Corbetta, O. V. Stepanyuk, H. Oka, A. M. Saletsky, D. Sander, V. S. Stepanyuk, and J. Kirschner Electron charge near atomically sharp corrugations at the surfaces of a solid tends to spill out and smoothen the abrupt variation of the positions of the positively charged atomic nuclei. The reason is that electrons are much less localized than nuclei. This has been discussed already some 70 years... [Phys. Rev. B 86, 235409] Published Mon Dec 10, 2012

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Argon-assisted growth of epitaxial graphene on Cu(111) (2012)

Zachary R. Robinson, Parul Tyagi, Tyler R. Mowll, Carl A. Ventrice, Jr., and James B. Hannon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Zachary R. Robinson, Parul Tyagi, Tyler R. Mowll, Carl A. Ventrice, Jr., and James B. Hannon The growth of graphene by catalytic decomposition of ethylene on Cu(111) in an ultrahigh vacuum system was investigated with low-energy electron diffraction, low-energy electron microscopy, and atomic force microscopy. Attempts to form a graphene overlayer using ethylene at pressures as high as 10 m... [Phys. Rev. B 86, 235413] Published Mon Dec 10, 2012

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Effects of strain on band structure and effective masses in MoS_{2} (2012)

H. Peelaers and C. G. Van de Walle

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): H. Peelaers and C. G. Van de Walle We use hybrid density functional theory to explore the band structure and effective masses of MoS 2 , and the effects of strain on the electronic properties. Strain allows engineering the magnitude as well as the nature (direct versus indirect) of the band gap. Deformation potentials that quantify the... [Phys. Rev. B 86, 241401] Published Mon Dec 10, 2012

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Four-wave mixing microscopy with electronic contrast of individual carbon nanotubes (2012)

Tatyana Sheps, Jordan Brocious, Brad L. Corso, O. Tolga Gül, Desiré Whitmore, Göksel Durkaya, Eric O. Potma, and Philip G. Collins

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Tatyana Sheps, Jordan Brocious, Brad L. Corso, O. Tolga Gül, Desiré Whitmore, Göksel Durkaya, Eric O. Potma, and Philip G. Collins We review an extensive study of the factors that influence the intensity of coherent, nonlinear four-wave mixing (FWM) in carbon nanotubes, with particular attention to the variability inherent to single-walled carbon nanotubes (SWNTs). Through a combination of spatial imaging and spectroscopy appli... [Phys. Rev. B 86, 235412] Published Mon Dec 10, 2012

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Jun-Won Rhim and Kwon Park

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Jun-Won Rhim and Kwon Park Intricate interplay between the periodicity of the lattice structure and that of the cyclotron motion gives rise to a well-known self-similar fractal structure of the energy eigenvalue, known as the Hofstadter butterfly, for an electron moving in lattice under magnetic field. Connected with the n =0 ... [Phys. Rev. B 86, 235411] Published Mon Dec 10, 2012

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Impalement dynamics and Brownian motion of solid islands on nanopillars (2012)

M. Ignacio and O. Pierre-Louis

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): M. Ignacio and O. Pierre-Louis We study the dynamics of solid islands deposited on nanopillars using kinetic Monte Carlo simulations. The islands are initially placed on the top of the pillars, in the so-called Cassie-Baxter state. For high pillars, the dynamics is divided into two phases. The first phase corresponds to the deter... [Phys. Rev. B 86, 235410] Published Mon Dec 10, 2012

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Electron-phonon interaction of one-dimensional and two-dimensional surface states in indium adlayers on the Si(111) surface (2012)

Sang Hoon Uhm and Han Woong Yeom

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Sang Hoon Uhm and Han Woong Yeom We performed angle-resolved photoelectron spectroscopy measurements on one- and two-dimensional (1D and 2D) metallic surface states in indium layers on the Si(111) surface as a function of temperature. The temperature dependence of surface-state energy widths was used to estimate the electron-phonon... [Phys. Rev. B 86, 245408] Published Mon Dec 10, 2012

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Atomistic modeling of anharmonic phonon-phonon scattering in nanowires (2012)

Mathieu Luisier

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Mathieu Luisier Phonon transport is simulated in ultrascaled nanowires in the presence of anharmonic phonon-phonon scattering. A modified valence-force-field model containing four types of bond deformation is employed to describe the phonon band structure. The inclusion of five additional bond deformation potential... [Phys. Rev. B 86, 245407] Published Mon Dec 10, 2012

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Orbital-dependent electron tunneling within the atom superposition approach: Theory and application to W(110) (2012)

Krisztián Palotás, Gábor Mándi, and László Szunyogh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-13

Description: Author(s): Krisztián Palotás, Gábor Mándi, and László Szunyogh We introduce an orbital-dependent electron tunneling model and implement it within the atom superposition approach for simulating scanning tunneling microscopy (STM) and spectroscopy (STS). Applying our method, we analyze the convergence and the orbital contributions to the tunneling current and the... [Phys. Rev. B 86, 235415] Published Wed Dec 12, 2012

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Helical states in curved bilayer graphene (2012)

Jelena Klinovaja, Gerson J. Ferreira, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-13

Description: Author(s): Jelena Klinovaja, Gerson J. Ferreira, and Daniel Loss We study spin effects of quantum wires formed in bilayer graphene by electrostatic confinement. With a proper choice of the confinement direction, we show that in the presence of magnetic field, spin orbit interaction induced by curvature, and intervalley scattering, bound states emerge that are hel... [Phys. Rev. B 86, 235416] Published Wed Dec 12, 2012

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Spatial inhomogeneities at the LaAlO_{3}/SrTiO_{3} interface: Evidence from second harmonic generation (2012)

T. Günter, A. Rubano, D. Paparo, M. Lilienblum, L. Marrucci, F. Miletto Granozio, U. Scotti di Uccio, R. Jany, C. Richter, J. Mannhart, and M. Fiebig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-13

Description: Author(s): T. Günter, A. Rubano, D. Paparo, M. Lilienblum, L. Marrucci, F. Miletto Granozio, U. Scotti di Uccio, R. Jany, C. Richter, J. Mannhart, and M. Fiebig Phase-sensitive, spatially resolved optical second-harmonic-generation experiments were performed on LaAlO 3 /SrTiO 3 heterostructures. Lateral inhomogeneities on a length scale of ≈30 μ m are found when a one-unit-cell-thick epitaxial monolayer of LaAlO 3 is grown on TiO 2 -terminated SrTiO 3 single crysta... [Phys. Rev. B 86, 235418] Published Wed Dec 12, 2012

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

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Decoherence effects on weak value measurements in double quantum dots (2012)

Mark Thomas and Alessandro Romito

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-13

Description: Author(s): Mark Thomas and Alessandro Romito We study the effect of decoherence on a weak value measurement in a paradigm system consisting of a double quantum dot continuously measured by a quantum point contact. Fluctuations of the parameters controlling the dot state induce decoherence. We find that, for measurements longer than the decoher... [Phys. Rev. B 86, 235419] Published Wed Dec 12, 2012

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Ab initio transport fingerprints for resonant scattering in graphene (2012)

Karri Saloriutta, Andreas Uppstu, Ari Harju, and Martti J. Puska

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-13

Description: Author(s): Karri Saloriutta, Andreas Uppstu, Ari Harju, and Martti J. Puska We have recently shown that by using a scaling approach for randomly distributed topological defects in graphene, reliable estimates for transmission properties of macroscopic samples can be calculated based even on single-defect calculations [ A. Uppstu et al. Phys. Rev. B 85 041401 (2012) ]. We no... [Phys. Rev. B 86, 235417] Published Wed Dec 12, 2012

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Spin-orbit coupling assisted by flexural phonons in graphene (2012)

H. Ochoa, A. H. Castro Neto, V. I. Fal'ko, and F. Guinea

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-14

Description: Author(s): H. Ochoa, A. H. Castro Neto, V. I. Fal'ko, and F. Guinea We analyze the couplings between spins and phonons in graphene. We present a complete analysis of the possible couplings between spins and flexural, out-of-plane, vibrations. From tight-binding models, we obtain analytical and numerical estimates of their strength. We show that dynamical effects, in... [Phys. Rev. B 86, 245411] Published Thu Dec 13, 2012

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Evidence for longitudinal coherence in fast atom diffraction (2012)

M. Busch, J. Seifert, E. Meyer, and H. Winter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-14

Description: Author(s): M. Busch, J. Seifert, E. Meyer, and H. Winter Angular distributions for grazing scattering of keV H atoms from an Al 2 O 3 (112̅ 0) surface were recorded. These distributions reveal defined diffraction patterns which can be understood in terms of quantum scattering from well-ordered surfaces. From the observation of so-called Laue circles, w... [Phys. Rev. B 86, 241402] Published Thu Dec 13, 2012

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Interplay of intra- and interband absorption in a disordered graphene (2012)

F. T. Vasko, V. V. Mitin, V. Ryzhii, and T. Otsuji

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-15

Description: Author(s): F. T. Vasko, V. V. Mitin, V. Ryzhii, and T. Otsuji The absorption of heavily doped graphene in the terahertz and midinfrared spectral regions is considered, taking into account both the elastic scattering due to finite-range disorder and the variations of concentration due to long-range disorder. The interplay between intra- and interband transition... [Phys. Rev. B 86, 235424] Published Fri Dec 14, 2012

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ac Josephson transport through interacting quantum dots (2012)

Bastian Hiltscher, Michele Governale, and Jürgen König

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-18

Description: Author(s): Bastian Hiltscher, Michele Governale, and Jürgen König We investigate the ac Josephson current through a quantum dot with strong Coulomb interaction attached to two superconducting and one normal lead. To this end, we perform a perturbation expansion in the tunneling couplings within a diagrammatic real-time technique. The ac Josephson current is connec... [Phys. Rev. B 86, 235427] Published Mon Dec 17, 2012

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Strong magnetic anisotropy of chemically bound Co dimers in a graphene sheet (2012)

Hem C. Kandpal, Klaus Koepernik, and Manuel Richter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-18

Description: Author(s): Hem C. Kandpal, Klaus Koepernik, and Manuel Richter The magnetism of cobalt atoms and dimers bound by single vacancies in a graphene sheet is investigated by means of relativistic density functional calculations. In both cases, local magnetic moments are formed despite strong chemical binding. While orbital magnetism is suppressed in the Co atoms, ma... [Phys. Rev. B 86, 235430] Published Mon Dec 17, 2012

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Charged-phonon theory and Fano effect in the optical spectroscopy of bilayer graphene (2012)

E. Cappelluti, L. Benfatto, M. Manzardo, and A. B. Kuzmenko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): E. Cappelluti, L. Benfatto, M. Manzardo, and A. B. Kuzmenko Since their discovery, graphene-based systems represent an exceptional playground to explore the emergence of peculiar quantum effects. The present paper focuses on the anomalous appearance of strong infrared phonon resonances in the optical spectroscopy of bilayer graphene and on their pronounced F... [Phys. Rev. B 86, 115439] Published Mon Sep 24, 2012

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Kinetics of photoinduced matter transport driven by intensity and polarization in thin films containing azobenzene (2012)

F. Fabbri, Y. Lassailly, S. Monaco, K. Lahlil, J. P. Boilot, and J. Peretti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): F. Fabbri, Y. Lassailly, S. Monaco, K. Lahlil, J. P. Boilot, and J. Peretti We investigate the kinetics of photoinduced deformation phenomena in azobenzene-containing thin solid films. We show that a light intensity pattern and a light polarization pattern produce two distinct material transport processes whose direction and kinetics can be independently controlled. The kin... [Phys. Rev. B 86, 115440] Published Mon Sep 24, 2012

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van der Waals interactions mediating the cohesion of fullerenes on graphene (2012)

M. Švec, P. Merino, Y. J. Dappe, C. González, E. Abad, P. Jelínek, and J. A. Martín-Gago

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): M. Švec, P. Merino, Y. J. Dappe, C. González, E. Abad, P. Jelínek, and J. A. Martín-Gago Fullerenes on single-layer epitaxial graphene are a model system to study very faint interactions at a molecular level. By a variable temperature scanning tunneling microscope we have been able to study ordered fullerene layers at 40 K, exclusively bound by van der Waals interactions. The experiment... [Phys. Rev. B 86, 121407] Published Mon Sep 24, 2012

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Charged impurity scattering in top-gated graphene nanostructures (2012)

Zhun-Yong Ong and Massimo V. Fischetti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): Zhun-Yong Ong and Massimo V. Fischetti We study charged impurity scattering and static screening in a top-gated substrate-supported graphene nanostructure. Our model describes how boundary conditions can be incorporated into scattering, sheds light on the dielectric response of these nanostructures, provides insights into the effect of t... [Phys. Rev. B 86, 121409] Published Mon Sep 24, 2012

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Insulating behavior of an amorphous graphene membrane (2012)

Dinh Van Tuan, Avishek Kumar, Stephan Roche, Frank Ortmann, M. F. Thorpe, and Pablo Ordejon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-25

Description: Author(s): Dinh Van Tuan, Avishek Kumar, Stephan Roche, Frank Ortmann, M. F. Thorpe, and Pablo Ordejon We investigate the charge transport properties of planar amorphous graphene that is fully topologically disordered, in the form of s p 2 threefold coordinated networks consisting of hexagonal rings but also including many pentagons and heptagons distributed in a random fashion. Using the Kubo transpor... [Phys. Rev. B 86, 121408] Published Mon Sep 24, 2012

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Wave-packet scattering on graphene edges in the presence of a pseudomagnetic field (2012)

D. R. da Costa, A. Chaves, G. A. Farias, L. Covaci, and F. M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): D. R. da Costa, A. Chaves, G. A. Farias, L. Covaci, and F. M. Peeters The scattering of a Gaussian wave packet in armchair and zigzag graphene edges is theoretically investigated by numerically solving the time-dependent Schrödinger equation for the tight-binding model Hamiltonian. Our theory allows us to investigate scattering in reciprocal space, and depending on th... [Phys. Rev. B 86, 115434] Published Fri Sep 21, 2012

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Highly ordered nanoscale patterns produced by masked ion bombardment of a moving solid surface (2012)

Martin P. Gelfand and R. Mark Bradley

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): Martin P. Gelfand and R. Mark Bradley We introduce a fabrication method in which a mask with a long, narrow slit is placed between the source of an ion beam and the surface of a solid moving with constant speed. Numerical simulations reveal the method can generate surface ripples and arrays of nanoholes that are virtually defect free. I... [Phys. Rev. B 86, 121406] Published Fri Sep 21, 2012

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Sequence-dependent spin-selective tunneling along double-stranded DNA (2012)

Ai-Min Guo and Qing-feng Sun

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-26

Description: Author(s): Ai-Min Guo and Qing-feng Sun We report spin-selective tunneling of electrons along double-stranded DNA sandwiched between nonmagnetic leads. On the basis of a model Hamiltonian which contains spin-orbit interaction and dephasing, the conductance and the spin polarization are calculated for natural and artificial DNA molecules b... [Phys. Rev. B 86, 115441] Published Tue Sep 25, 2012

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Broken translational symmetry in an emergent paramagnetic phase of graphene (2012)

Gia-Wei Chern, Rafael M. Fernandes, Rahul Nandkishore, and Andrey V. Chubukov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): Gia-Wei Chern, Rafael M. Fernandes, Rahul Nandkishore, and Andrey V. Chubukov We show that the spin-density wave state on the partially filled honeycomb and triangular lattices is preempted by a paramagnetic phase that breaks an emergent Z 4 symmetry of the system associated with the four inequivalent arrangements of spins in the quadrupled unit cell. Unlike other emergent par... [Phys. Rev. B 86, 115443] Published Wed Sep 26, 2012

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Water-assisted mobile charge induced screening and origin of hysteresis in carbon nanotube field-effect transistors (2012)

Y. Pascal-Levy, E. Shifman, M. Pal-Chowdhury, I. Kalifa, T. Rabkin, O. Shtempluck, A. Razin, V. Kochetkov, and Y. E. Yaish

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): Y. Pascal-Levy, E. Shifman, M. Pal-Chowdhury, I. Kalifa, T. Rabkin, O. Shtempluck, A. Razin, V. Kochetkov, and Y. E. Yaish Carbon nanotube field-effect transistors (CNT FETs) have many possible applications in future nanoelectronics due to their excellent properties. However, one of the major challenges regarding their performance is the noticeable gate hysteresis which is often displayed in their transfer characteristi... [Phys. Rev. B 86, 115444] Published Wed Sep 26, 2012

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Fermions on bilayer graphene: Symmetry breaking for B=0 and ν=0 (2012)

Robert E. Throckmorton and Oskar Vafek

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): Robert E. Throckmorton and Oskar Vafek We extend previous analyses of fermions on a honeycomb bilayer lattice via weak-coupling renormalization group (RG) methods with extremely short-range and extremely long-range interactions to the case of finite-range interactions. In particular, we consider different types of interactions including ... [Phys. Rev. B 86, 115447] Published Wed Sep 26, 2012

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Electronic structure of Eu atomic wires encapsulated inside single-wall carbon nanotubes (2012)

Ryo Nakanishi, Ryo Kitaura, Paola Ayala, Hidetsugu Shiozawa, Kathrin de Blauwe, Patrick Hoffmann, Daeheon Choi, Yasumitsu Miyata, Thomas Pichler, and Hisanori Shinohara

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): Ryo Nakanishi, Ryo Kitaura, Paola Ayala, Hidetsugu Shiozawa, Kathrin de Blauwe, Patrick Hoffmann, Daeheon Choi, Yasumitsu Miyata, Thomas Pichler, and Hisanori Shinohara X-ray absorption (resonant) photoelectron spectroscopy has been employed to investigate electronic structure of Eu atomic wires encapsulated in single-wall carbon nanotubes (SWCNTs). The measurements reveal that there is a substantial electron transfer of +1.79 ± 0.11 from a Eu atom to the surroundi... [Phys. Rev. B 86, 115445] Published Wed Sep 26, 2012

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Lifetime reduction of surface states at Cu, Ag, and Au(111) caused by impurity scattering (2012)

Swantje Heers, Phivos Mavropoulos, Samir Lounis, Rudolf Zeller, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-27

Description: Author(s): Swantje Heers, Phivos Mavropoulos, Samir Lounis, Rudolf Zeller, and Stefan Blügel We present density-functional results on the lifetime of the (111) surface state of the noble metals. We consider scattering on the Fermi surface caused by impurity atoms belonging to the 3 d and 4 s p series. The results are analyzed with respect to film thickness and with respect to separation of sca... [Phys. Rev. B 86, 125444] Published Wed Sep 26, 2012

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Universal features of the excitation spectrum in a generalized Gibbs distribution ensemble (2012)

E. Demler and A. M. Tsvelik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-28

Description: Author(s): E. Demler and A. M. Tsvelik It is shown that excitation spectra of generalized Gibbs ensembles of one-dimensional integrable models with isotopic symmetry contain universal features insensitive to details of the distribution. Namely, the low energy limit of the subsystem of isotopic (for instance, spin) excitations is describe... [Phys. Rev. B 86, 115448] Published Thu Sep 27, 2012

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Second-harmonic generation in metallic nanoparticles: Clarification of the role of the surface (2012)

Cristian Ciracì, Ekaterina Poutrina, Michael Scalora, and David R. Smith

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-28

Description: Author(s): Cristian Ciracì, Ekaterina Poutrina, Michael Scalora, and David R. Smith We present a numerical investigation of the second-order nonlinear optical properties of metal-based metamaterial nanoresonators. The nonlinear optical response of the metal is described by a hydrodynamic model, with the effects of electron pressure in the electron gas also taken into account. We sh... [Phys. Rev. B 86, 115451] Published Thu Sep 27, 2012

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Radiation effects on the electronic properties of bilayer graphene (2012)

Eric Suárez Morell and Luis E. F. Foa Torres

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-29

Description: Author(s): Eric Suárez Morell and Luis E. F. Foa Torres We report on the effects of laser illumination on the electronic properties of bilayer graphene. By using Floquet theory combined with Green's functions, we unveil the appearance of laser-induced gaps not only at integer multiples of ℏ Ω /2 but also at the Dirac point with features which are shown to ... [Phys. Rev. B 86, 125449] Published Fri Sep 28, 2012

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Tuning of L1_{0} atomic order in Co-Pt nanoparticles: Ab initio insights (2012)

Roman V. Chepulskii and W. H. Butler

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-02

Description: Author(s): Roman V. Chepulskii and W. H. Butler Monte Carlo simulation of the atomic configurational behavior of Co-Pt nanoparticles is performed in wide temperature-composition-size ranges. The simulation is based on bulk and local (inhomogeneous) cluster expansions calculated from first principles. A sharp drop of equilibrium L 1 0 order is predi... [Phys. Rev. B 86, 155401] Published Mon Oct 01, 2012

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Initial- and final-state effects on screening and branching ratio in 2p x-ray absorption of size-selected free 3d transition metal clusters (2012)

K. Hirsch, V. Zamudio-Bayer, J. Rittmann, A. Langenberg, M. Vogel, T. Möller, B. v. Issendorff, and J. T. Lau

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-02

Description: Author(s): K. Hirsch, V. Zamudio-Bayer, J. Rittmann, A. Langenberg, M. Vogel, T. Möller, B. v. Issendorff, and J. T. Lau A comprehensive study of size-dependent initial- and final-state effects in 2 p x-ray absorption of free, homonuclear 3 d transition metal clusters from titanium through nickel in a size range of 1–200 atoms is presented. From atom to bulk the 2 p →3 d excitation in 3 d transition metals shifts to higher ... [Phys. Rev. B 86, 165402] Published Mon Oct 01, 2012

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Tracking quasiparticle energies in graphene with near-field optics (2012)

Phillip E. C. Ashby and J. P. Carbotte

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-03

Description: Author(s): Phillip E. C. Ashby and J. P. Carbotte Advances in infrared nanoscopy have enabled access to the finite momentum optical conductivity σ (q, ω ). The finite momentum optical conductivity in graphene has a peak at the Dirac fermion quasiparticle energy ε ( k F − q ), i.e., at the Fermi momentum minus the incident photon momentum. We find that the p... [Phys. Rev. B 86, 165405] Published Tue Oct 02, 2012

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Size-dependent evolution of the atomic vibrational density of states and thermodynamic properties of isolated Fe nanoparticles (2012)

B. Roldan Cuenya, L. K. Ono, J. R. Croy, K. Paredis, A. Kara, H. Heinrich, J. Zhao, E. E. Alp, A. T. Dela; Riva, A. Datye, E. A. Stach, and W. Keune

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-03

Description: Author(s): B. Roldan Cuenya, L. K. Ono, J. R. Croy, K. Paredis, A. Kara, H. Heinrich, J. Zhao, E. E. Alp, A. T. DelaRiva, A. Datye, E. A. Stach, and W. Keune We have gained insight into the internal degree of atomic disorder in isolated size-selected Fe nanoparticles (NPs) (∼2–6 nm in size) supported on SiO 2 /Si(111) and Al 2 O 3 (0001) from precise measurements of the low-energy (low- E ) part of the phonon density of states [PDOS, g ( E )] via 57 Fe nuclear reson... [Phys. Rev. B 86, 165406] Published Tue Oct 02, 2012

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

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Nonequilibrium transport with self-consistent renormalized contacts for a single-molecule nanodevice with electron-vibron interaction (2012)

H. Ness and L. K. Dash

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): H. Ness and L. K. Dash We present an application of a new formalism to treat the quantum transport properties of fully interacting nanoscale junctions [ Phys. Rev. B 84 235428 (2011) ]. We consider a model single-molecule nanojunction in the presence of two kinds of electron-vibron interactions. In terms of electron densi... [Phys. Rev. B 86, 155418] Published Fri Oct 12, 2012

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

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Interaction of a graphene sheet with a ferromagnetic metal plate (2012)

Anh D. Phan, N. A. Viet, Nikolai A. Poklonski, Lilia M. Woods, and Chi H. Le

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): Anh D. Phan, N. A. Viet, Nikolai A. Poklonski, Lilia M. Woods, and Chi H. Le Dispersion forces, such as Casimir and van der Waals forces, can have a significant influence on the fabrication, handling, and assembly processes as well as the performance of micro- and nanodevices. In this paper, we investigate the Casimir force between a graphene sheet and a ferromagnetic metall... [Phys. Rev. B 86, 155419] Published Fri Oct 12, 2012

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

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Poisson noise induced switching in driven micromechanical resonators (2012)

J. Zou, S. Buvaev, M. Dykman, and H. B. Chan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): J. Zou, S. Buvaev, M. Dykman, and H. B. Chan We study Poisson noise induced switching between coexisting vibrational states in driven nonlinear micromechanical resonators. In contrast to Gaussian noise induced switching, the measured logarithm of the switching rate is proportional not to the reciprocal noise intensity, but to its logarithm, fo... [Phys. Rev. B 86, 155420] Published Fri Oct 12, 2012

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

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86

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Self-assembly mechanisms of short atomic chains on single-layer graphene and boron nitride (2012)

V. Ongun Özçelik and S. Ciraci

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): V. Ongun Özçelik and S. Ciraci Nucleation and growth mechanisms of short chains of carbon atoms on single-layer, hexagonal boron nitride (h-BN) and short BN chains on graphene are investigated using first-principles plane-wave calculations. Our analysis starts with the adsorption of a single carbon adatom and examines its migrati... [Phys. Rev. B 86, 155421] Published Fri Oct 12, 2012

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Theory of interfacial plasmon-phonon scattering in supported graphene (2012)

Zhun-Yong Ong and Massimo V. Fischetti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): Zhun-Yong Ong and Massimo V. Fischetti One of the factors limiting electron mobility in supported graphene is remote phonon scattering. We formulate the theory of the coupling between graphene plasmon and substrate surface polar phonon (SPP) modes and find that it leads to the formation of interfacial plasmon-phonon (IPP) modes, from whi... [Phys. Rev. B 86, 165422] Published Fri Oct 12, 2012

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

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Inelastic scattering in nanoscale devices: One-shot current-conserving lowest-order approximation (2012)

H. Mera, M. Lannoo, C. Li, N. Cavassilas, and M. Bescond

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): H. Mera, M. Lannoo, C. Li, N. Cavassilas, and M. Bescond We describe a lowest-order approximation (LOA) to the nonequilibrium Green's function in the presence of interactions, and generally address how one can build Φ -derivable one-shot approximations that satisfy the continuity equation. These approximations produce conserved electronic currents in one s... [Phys. Rev. B 86, 161404] Published Fri Oct 12, 2012

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

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Double coupled electron shuttle (2012)

M. Prada and G. Platero

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): M. Prada and G. Platero A nanoshuttle consisting of two movable islands connected in series and integrated between two contacts is studied. We evaluate the electron transport through the system in the presence of a source-drain voltage with and without an rf excitation. We evaluate the response of the system in terms of th... [Phys. Rev. B 86, 165424] Published Fri Oct 12, 2012

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Probing spin-charge relation by magnetoconductance in one-dimensional polymer nanofibers (2012)

A. Choi, K. H. Kim, S. J. Hong, M. Goh, K. Akagi, R. B. Kaner, N. N. Kirova, S. A. Brazovskii, A. T. Johnson, D. A. Bonnell, E. J. Mele, and Y. W. Park

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): A. Choi, K. H. Kim, S. J. Hong, M. Goh, K. Akagi, R. B. Kaner, N. N. Kirova, S. A. Brazovskii, A. T. Johnson, D. A. Bonnell, E. J. Mele, and Y. W. Park Polymer nanofibers are one-dimensional organic hydrocarbon systems containing conducting polymers where the nonlinear local excitations such as solitons, polarons, and bipolarons formed by the electron-phonon interaction were predicted. Magnetoconductance (MC) can simultaneously probe both the spin ... [Phys. Rev. B 86, 155423] Published Fri Oct 12, 2012

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Chemical tip fingerprinting in scanning probe microscopy of an oxidized Cu(110) surface (2012)

J. Bamidele, Y. Kinoshita, R. Turanský, S. H. Lee, Y. Naitoh, Y. J. Li, Y. Sugawara, I. Štich, and L. Kantorovich

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): J. Bamidele, Y. Kinoshita, R. Turanský, S. H. Lee, Y. Naitoh, Y. J. Li, Y. Sugawara, I. Štich, and L. Kantorovich We present a joint experimental/theoretical study of the oxygen-terminated Cu(110) surface. Noncontact atomic force microscopy (NC-AFM) identifies patches of p (2×1) and c (6×2) structures. For the latter reconstruction, we observe distinctly different NC-AFM images depending on the chemical tip ident... [Phys. Rev. B 86, 155422] Published Fri Oct 12, 2012

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Towards equilibration and thermalization between finite quantum systems: Unitary emulation of dephasing effects and inelastic interactions (2012)

Manas Kulkarni, Kunal L. Tiwari, and Dvira Segal

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): Manas Kulkarni, Kunal L. Tiwari, and Dvira Segal Using a unitary time evolution scheme, we demonstrate an approach towards a Gibbs-like equilibrium state, with a common temperature and a chemical potential, of two metallic grains connected by a weak link prepared with a different number of noninteracting electrons. This unitary equilibration is ac... [Phys. Rev. B 86, 155424] Published Fri Oct 12, 2012

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Excitonic resonances in WS_{2} nanotubes (2012)

Matthias Staiger, Peter Rafailov, Konstantin Gartsman, Hagen Telg, Matthias Krause, Gal Radovsky, Alla Zak, and Christian Thomsen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-13

Description: Author(s): Matthias Staiger, Peter Rafailov, Konstantin Gartsman, Hagen Telg, Matthias Krause, Gal Radovsky, Alla Zak, and Christian Thomsen Resonance Raman profiles of WS 2 nanotubes of different diameter are presented. We show that the A excitonic transition energy lies below the bulk value and is increasingly redshifted with decreasing diameter of the nanotubes. The findings are attributed to strain effects associated with the curvatur... [Phys. Rev. B 86, 165423] Published Fri Oct 12, 2012

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Spin polarization and g-factor enhancement in graphene nanoribbons in a magnetic field (2012)

S. Ihnatsenka and I. V. Zozoulenko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-06

Description: Author(s): S. Ihnatsenka and I. V. Zozoulenko We provide a systematic quantitative description of spin polarization in armchair and zigzag graphene nanoribbons (GNRs) in a perpendicular magnetic field. We first address spinless electrons within the Hartree approximation, studying the evolution of the magnetoband structure and formation of the c... [Phys. Rev. B 86, 155407] Published Fri Oct 05, 2012

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Dynamics of coupled plasmon polariton wave packets excited at a subwavelength slit in optically thin metal films (2012)

Lei-Ming Wang, Lingxiao Zhang, Tamar Seideman, and Hrvoje Petek

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-06

Description: Author(s): Lei-Ming Wang, Lingxiao Zhang, Tamar Seideman, and Hrvoje Petek We study by numerical simulations the excitation and propagation dynamics of coupled surface plasmon polariton (SPP) wave packets (WPs) in optically thin Ag films and a bulk Ag/vacuum interface under the illumination of a subwavelength slit by 400 nm continuous wave (cw) and femtosecond pulsed light... [Phys. Rev. B 86, 165408] Published Fri Oct 05, 2012

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Velocity weakening and possibility of aftershocks in nanoscale friction experiments (2012)

E. A. Jagla

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-09

Description: Author(s): E. A. Jagla We study the frictional behavior of small contacts as those realized in the atomic force microscope and other experimental setups, in the framework of generalized Prandtl-Tomlinson models. Particular attention is paid to mechanisms that generate velocity weakening, namely, a decreasing average frict... [Phys. Rev. B 86, 155408] Published Mon Oct 08, 2012

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Infrared magnetospectroscopy of graphite in tilted fields (2012)

N. A. Goncharuk, L. Nádvorník, C. Faugeras, M. Orlita, and L. Smrčka

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-10-09

Description: Author(s): N. A. Goncharuk, L. Nádvorník, C. Faugeras, M. Orlita, and L. Smrčka The electronic structure of Bernal-stacked graphite subjected to tilted magnetic fields has been investigated using infrared magnetotransmission experiments. With the increasing in-plane component of the magnetic field B ∥ , we observe significant broadening and partially also splitting of interband i... [Phys. Rev. B 86, 155409] Published Mon Oct 08, 2012

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Graphyne: Hexagonal network of carbon with versatile Dirac cones (2012)

Bog G. Kim and Hyoung Joon Choi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): Bog G. Kim and Hyoung Joon Choi We study α, β, and γ graphyne, a class of graphene allotropes with carbon triple bonds, using a first-principles density-functional method and tight-binding calculation. We find that graphyne has versatile Dirac cones and it is due to remarkable roles of the carbon triple bonds in electronic and ato... [Phys. Rev. B 86, 115435] Published Fri Sep 21, 2012

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

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Electron-hole pairing in a topological insulator thin film (2012)

D. K. Efimkin, Yu. E. Lozovik, and A. A. Sokolik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): D. K. Efimkin, Yu. E. Lozovik, and A. A. Sokolik We consider the pairing of massless Dirac electrons and holes located on opposite surfaces of thin films of “strong” three-dimensional topological insulators. Such pairing is predicted to give rise to a topological exciton condensate with unusual properties. We estimate the quantitatively achievable... [Phys. Rev. B 86, 115436] Published Fri Sep 21, 2012

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Ionic screening of charged impurities in electrolytically gated graphene (2012)

Z. L. Mišković, P. Sharma, and F. O. Goodman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-22

Description: Author(s): Z. L. Mišković, P. Sharma, and F. O. Goodman We present a model for dual-gated, single-layer graphene, with a back gate separated by a layer of oxide, and the top gate potential applied through a thick layer of liquid electrolyte that contains mobile ions in a diffuse layer, described in the Debye-Hückel approximation, which is separated from ... [Phys. Rev. B 86, 115437] Published Fri Sep 21, 2012

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