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Direct surface charging and alkali-metal doping for tuning the interlayer magnetic order in planar nanostructures (2015)

Tamene R. Dasa and Valeri S. Stepanyuk

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Tamene R. Dasa and Valeri S. Stepanyuk The continuous reduction of magnetic units to ultrasmall length scales inspires efforts to look for a suitable means of controlling magnetic states. In this study, we show two surface charge alteration techniques for tuning the interlayer exchange coupling of ferromagnetic layers separated by parama… [Phys. Rev. B 92, 075412] Published Mon Aug 10, 2015

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

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TiS_{3} nanoribbons: Width-independent band gap and strain-tunable electronic properties (2015)

Jun Kang, Hasan Sahin, H. Duygu Ozaydin, R. Tugrul Senger, and François M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Jun Kang, Hasan Sahin, H. Duygu Ozaydin, R. Tugrul Senger, and François M. Peeters The electronic properties, carrier mobility, and strain response of TiS 3 nanoribbons ( TiS 3 NRs) are investigated by first-principles calculations. We found that the electronic properties of TiS 3 NRs strongly depend on the edge type ( a or b ). All a - TiS 3 NRs are metallic with a magnetic ground state, … [Phys. Rev. B 92, 075413] Published Mon Aug 10, 2015

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

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Real-space imaging of nanotip plasmons using electron energy loss spectroscopy (2015)

Benjamin Schröder, Thorsten Weber, Sergey V. Yalunin, Thomas Kiel, Christian Matyssek, Murat Sivis, Sascha Schäfer, Felix von Cube, Stephan Irsen, Kurt Busch, Claus Ropers, and Stefan Linden

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Benjamin Schröder, Thorsten Weber, Sergey V. Yalunin, Thomas Kiel, Christian Matyssek, Murat Sivis, Sascha Schäfer, Felix von Cube, Stephan Irsen, Kurt Busch, Claus Ropers, and Stefan Linden We report the spatial mapping of surface plasmons on conical gold nanotips by electron energy loss spectroscopy. We observe standing-wave patterns resulting from reflections of the fundamental surface-plasmon mode at the nanotip apex. The experimental results are in very good agreement with numerica… [Phys. Rev. B 92, 085411] Published Mon Aug 10, 2015

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

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OH-terminated two-dimensional transition metal carbides and nitrides as ultralow work function materials (2015)

Mohammad Khazaei, Masao Arai, Taizo Sasaki, Ahmad Ranjbar, Yunye Liang, and Seiji Yunoki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Mohammad Khazaei, Masao Arai, Taizo Sasaki, Ahmad Ranjbar, Yunye Liang, and Seiji Yunoki MXenes are a set of two-dimensional transition metal carbides and nitrides that offer many potential applications in energy storage and electronic devices. As an important parameter to design new electronic devices, we investigate the work functions of bare MXenes and their functionalized ones with … [Phys. Rev. B 92, 075411] Published Mon Aug 10, 2015

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

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Analytic Flow Equations for the Fermi Liquid Parameters of the Anderson Impurity Model (2015)

Vassilis Pandis and Alex C. Hewson

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-11

Description: Author(s): Vassilis Pandis and Alex C. Hewson The low temperature behavior of a Fermi liquid can be described in terms of quasiparticle excitations that are in 1-1 correspondence with those of the noninteracting system. Because of adiabatic continuity, the Landau parameters, which describe the interactions between the quasiparticles, must evolv… [Phys. Rev. Lett. 115, 076401] Published Mon Aug 10, 2015

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Phonon-limited carrier mobility and resistivity from carbon nanotubes to graphene (2015)

Jing Li, Henrique Pereira Coutada Miranda, Yann-Michel Niquet, Luigi Genovese, Ivan Duchemin, Ludger Wirtz, and Christophe Delerue

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-12

Description: Author(s): Jing Li, Henrique Pereira Coutada Miranda, Yann-Michel Niquet, Luigi Genovese, Ivan Duchemin, Ludger Wirtz, and Christophe Delerue Under which conditions do the electrical transport properties of one-dimensional (1D) carbon nanotubes (CNTs) and 2D graphene become equivalent? We have performed atomistic calculations of the phonon-limited electrical mobility in graphene and in a wide range of CNTs of different types to address th… [Phys. Rev. B 92, 075414] Published Tue Aug 11, 2015

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

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Quantum Spin Liquid Emerging from Antiferromagnetic Order by Introducing Disorder (2015)

T. Furukawa, K. Miyagawa, T. Itou, M. Ito, H. Taniguchi, M. Saito, S. Iguchi, T. Sasaki, and K. Kanoda

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-12

Description: Author(s): T. Furukawa, K. Miyagawa, T. Itou, M. Ito, H. Taniguchi, M. Saito, S. Iguchi, T. Sasaki, and K. Kanoda Quantum spin liquids, which are spin versions of quantum matter, have been sought after in systems with geometrical frustration. We show that disorder drives a classical magnet into a quantum spin liquid through conducting NMR experiments on an organic Mott insulator, κ − ( ET ) 2 Cu [ N ( CN ) 2 ] Cl . Antiferrom… [Phys. Rev. Lett. 115, 077001] Published Tue Aug 11, 2015

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Helicoidal graphene nanoribbons: Chiraltronics (2015)

Victor Atanasov and Avadh Saxena

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-07-30

Description: Author(s): Victor Atanasov and Avadh Saxena We present a calculation of the effective geometry-induced quantum potential for the carriers in graphene shaped as a helicoidal nanoribbon. In this geometry the twist of the nanoribbon plays the role of an effective transverse electric field in graphene and this is reminiscent of the Hall effect. H… [Phys. Rev. B 92, 035440] Published Wed Jul 29, 2015

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

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Stacking dependence of carrier interactions in multilayer graphene systems (2015)

Yunsu Jang, E. H. Hwang, A. H. Mac; Donald, and Hongki Min

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-07-30

Description: Author(s): Yunsu Jang, E. H. Hwang, A. H. MacDonald, and Hongki Min We identify qualitative trends in the stacking sequence dependence of carrier-carrier interaction phenomena in multilayer graphene. Our theory is based on an approach which explicitly exhibits the important role in interaction phenomena of the momentum-direction-dependent intersite phases determined… [Phys. Rev. B 92, 041411(R)] Published Wed Jul 29, 2015

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

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Stability and electronic structure of two-dimensional allotropes of group-IV materials (2015)

Filipe Matusalem, Marcelo Marques, Lara K. Teles, and Friedhelm Bechstedt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-07-30

Description: Author(s): Filipe Matusalem, Marcelo Marques, Lara K. Teles, and Friedhelm Bechstedt We study six different two-dimensional (2D) allotropes of carbon, silicon, germanium, and tin by means of the ab initio density functional theory for the ground state and approximate methods to calculate their electronic structures, including quasiparticle effects. Four of the investigated allotrope… [Phys. Rev. B 92, 045436] Published Wed Jul 29, 2015

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

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Electric bias control of impurity effects in bilayer graphene (2015)

Y. G. Pogorelov, M. C. Santos, and V. M. Loktev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-04

Description: Author(s): Y. G. Pogorelov, M. C. Santos, and V. M. Loktev Formation of localized impurity levels within the band gap in bigraphene under applied electric field and the conditions for their collectivization at finite impurity concentrations are considered. It is shown that a qualitative restructuring of the quasiparticle spectrum within the initial band gap… [Phys. Rev. B 92, 075401] Published Mon Aug 03, 2015

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

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Electronic spectrum of twisted bilayer graphene (2015)

A. O. Sboychakov, A. L. Rakhmanov, A. V. Rozhkov, and Franco Nori

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-04

Description: Author(s): A. O. Sboychakov, A. L. Rakhmanov, A. V. Rozhkov, and Franco Nori We study the electronic properties of twisted bilayer graphene in the tight-binding approximation. The interlayer hopping amplitude is modeled by a function which depends not only on the distance between two carbon atoms, but also on the positions of neighboring atoms as well. Using the Lanczos algo… [Phys. Rev. B 92, 075402] Published Mon Aug 03, 2015

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

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Electrical transport limited by electron-phonon coupling from Boltzmann transport equation: An ab initio study of Si, Al, and MoS_{2} (2015)

Wu Li

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-06

Description: Author(s): Wu Li We demonstrate the ab initio electrical transport calculation limited by electron-phonon coupling by using the full solution of the Boltzmann transport equation (BTE), which applies equally to metals and semiconductors. Numerical issues are emphasized in this work. We show that the simple linear int… [Phys. Rev. B 92, 075405] Published Tue Aug 04, 2015

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

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Supercurrent reversal in Josephson junctions based on bilayer graphene flakes (2015)

Babak Zare Rameshti, Malek Zareyan, and Ali G. Moghaddam

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-06

Description: Author(s): Babak Zare Rameshti, Malek Zareyan, and Ali G. Moghaddam We investigate the Josephson effect in a bilayer graphene flake contacted by two monolayer sheets deposited by superconducting electrodes. It is found that when the electrodes are attached to the different layers of the bilayer, the Josephson current is in a π state, if the bilayer region is undoped… [Phys. Rev. B 92, 085403] Published Wed Aug 05, 2015

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

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Physics of a disordered Dirac point in epitaxial graphene from temperature-dependent magnetotransport measurements (2015)

J. Huang, J. A. Alexander-Webber, A. M. R. Baker, T. J. B. M. Janssen, A. Tzalenchuk, V. Antonov, T. Yager, S. Lara-Avila, S. Kubatkin, R. Yakimova, and R. J. Nicholas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): J. Huang, J. A. Alexander-Webber, A. M. R. Baker, T. J. B. M. Janssen, A. Tzalenchuk, V. Antonov, T. Yager, S. Lara-Avila, S. Kubatkin, R. Yakimova, and R. J. Nicholas We report a study of disorder effects on epitaxial graphene in the vicinity of the Dirac point by magnetotransport. Hall effect measurements show that the carrier density increases quadratically with temperature, in good agreement with theoretical predictions which take into account intrinsic therma… [Phys. Rev. B 92, 075407] Published Thu Aug 06, 2015

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

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Detection of interlayer interaction in few-layer graphene (2015)

Zefei Wu, Yu Han, Jiangxiazi Lin, Wei Zhu, Mingquan He, Shuigang Xu, Xiaolong Chen, Huanhuan Lu, Weiguang Ye, Tianyi Han, Yingying Wu, Gen Long, Junying Shen, Rui Huang, Lin Wang, Yuheng He, Yuan Cai, Rolf Lortz, Dangsheng Su, and Ning Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): Zefei Wu, Yu Han, Jiangxiazi Lin, Wei Zhu, Mingquan He, Shuigang Xu, Xiaolong Chen, Huanhuan Lu, Weiguang Ye, Tianyi Han, Yingying Wu, Gen Long, Junying Shen, Rui Huang, Lin Wang, Yuheng He, Yuan Cai, Rolf Lortz, Dangsheng Su, and Ning Wang Bernal-stacked few-layer graphene has been investigated by analyzing its Landau-level spectra through quantum capacitance measurements. We find that surface relaxation, which is insignificant in trilayer graphene, starts to manifest in Bernal-stacked tetralayer graphene. In trilayer graphene, the in… [Phys. Rev. B 92, 075408] Published Thu Aug 06, 2015

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

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Hot-Electron Intraband Luminescence from Single Hot Spots in Noble-Metal Nanoparticle Films (2015)

Tobias Haug, Philippe Klemm, Sebastian Bange, and John M. Lupton

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-08

Description: Author(s): Tobias Haug, Philippe Klemm, Sebastian Bange, and John M. Lupton Visible light emission from silver and gold nanoparticle films irradiated with ultrashort infrared pulses is governed by hot electron recombination within the conduction band. [Phys. Rev. Lett. 115, 067403] Published Fri Aug 07, 2015

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Entanglement of indistinguishable particles as a probe for quantum phase transitions in the extended Hubbard model (2015)

Fernando Iemini, Thiago O. Maciel, and Reinaldo O. Vianna

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-19

Description: Author(s): Fernando Iemini, Thiago O. Maciel, and Reinaldo O. Vianna We investigate the quantum phase transitions of the extended Hubbard model at half-filling with periodic boundary conditions employing the entanglement of particles, as opposed to the more traditional entanglement of modes. Our results show that the entanglement has either discontinuities or local m… [Phys. Rev. B 92, 075423] Published Tue Aug 18, 2015

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Toward a realistic description of multilayer black phosphorus: From GW approximation to large-scale tight-binding simulations (2015)

A. N. Rudenko, Shengjun Yuan, and M. I. Katsnelson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-19

Description: Author(s): A. N. Rudenko, Shengjun Yuan, and M. I. Katsnelson We provide a tight-binding model parametrization for black phosphorus (BP) with an arbitrary number of layers. The model is derived from partially self-consistent G W 0 approach, where the screened Coulomb interaction W 0 is calculated within the random phase approximation on the basis of density funct… [Phys. Rev. B 92, 085419] Published Tue Aug 18, 2015

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Topological symmetry breaking: Domain walls and partial instability of chiral edges (2015)

F. A. Bais and S. M. Haaker

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-20

Description: Author(s): F. A. Bais and S. M. Haaker In two-dimensional topological systems chiral edges may exhibit a spectral change due to the formation of a Bose condensate and partial confinement in the bulk according to the topological symmetry breaking (TSB) mechanism. We analyze in detail what happens in the bulk as well as on the edge for a s… [Phys. Rev. B 92, 075427] Published Wed Aug 19, 2015

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

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Tunneling Processes into Localized Subgap States in Superconductors (2015)

Michael Ruby, Falko Pientka, Yang Peng, Felix von Oppen, Benjamin W. Heinrich, and Katharina J. Franke

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-21

Description: Author(s): Michael Ruby, Falko Pientka, Yang Peng, Felix von Oppen, Benjamin W. Heinrich, and Katharina J. Franke We combine scanning-tunneling-spectroscopy experiments probing magnetic impurities on a superconducting surface with a theoretical analysis of the tunneling processes between (superconducting) tip and substrate. We show that the current through impurity-induced Shiba bound states is carried by singl… [Phys. Rev. Lett. 115, 087001] Published Thu Aug 20, 2015

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Layered Topological Crystalline Insulators (2015)

Youngkuk Kim, C. L. Kane, E. J. Mele, and Andrew M. Rappe

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-21

Description: Author(s): Youngkuk Kim, C. L. Kane, E. J. Mele, and Andrew M. Rappe Topological crystalline insulators (TCIs) are insulating materials whose topological property relies on generic crystalline symmetries. Based on first-principles calculations, we study a three-dimensional (3D) crystal constructed by stacking two-dimensional TCI layers. Depending on the interlayer in… [Phys. Rev. Lett. 115, 086802] Published Thu Aug 20, 2015

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Interaction-induced conductance from zero modes in a clean magnetic graphene waveguide (2015)

Laura Cohnitz, Wolfgang Häusler, Alex Zazunov, and Reinhold Egger

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-21

Description: Author(s): Laura Cohnitz, Wolfgang Häusler, Alex Zazunov, and Reinhold Egger We consider a waveguide formed in a clean graphene monolayer by a spatially inhomogeneous magnetic field. The single-particle dispersion relation for this waveguide exhibits a zero-energy Landau-like flat band, while finite-energy bands have dispersion and correspond, in particular, to snake orbits.… [Phys. Rev. B 92, 085422] Published Thu Aug 20, 2015

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Large-gap two-dimensional topological insulator in oxygen functionalized MXene (2015)

Hongming Weng, Ahmad Ranjbar, Yunye Liang, Zhida Song, Mohammad Khazaei, Seiji Yunoki, Masao Arai, Yoshiyuki Kawazoe, Zhong Fang, and Xi Dai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-25

Description: Author(s): Hongming Weng, Ahmad Ranjbar, Yunye Liang, Zhida Song, Mohammad Khazaei, Seiji Yunoki, Masao Arai, Yoshiyuki Kawazoe, Zhong Fang, and Xi Dai Two-dimensional (2D) topological insulators (TIs) have been recognized as a new class of quantum state of matter. They are distinguished from normal 2D insulators with their nontrivial band-structure topology identified by the Z 2 number as protected by time-reversal symmetry (TRS). Two-dimensional T… [Phys. Rev. B 92, 075436] Published Mon Aug 24, 2015

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Interaction-enabled topological phases in topological insulator–superconductor heterostructures (2015)

D. I. Pikulin, Ching-Kai Chiu, Xiaoyu Zhu, and M. Franz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-25

Description: Author(s): D. I. Pikulin, Ching-Kai Chiu, Xiaoyu Zhu, and M. Franz Topological phases of matter that depend for their existence on interactions are fundamentally interesting and potentially useful as platforms for future quantum computers. Despite the multitude of theoretical proposals, the only interaction-enabled topological phase experimentally observed is the f… [Phys. Rev. B 92, 075438] Published Mon Aug 24, 2015

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X-ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu (2015)

R. Kukreja, S. Bonetti, Z. Chen, D. Backes, Y. Acremann, J. A. Katine, A. D. Kent, H. A. Dürr, H. Ohldag, and J. Stöhr

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-25

Description: Author(s): R. Kukreja, S. Bonetti, Z. Chen, D. Backes, Y. Acremann, J. A. Katine, A. D. Kent, H. A. Dürr, H. Ohldag, and J. Stöhr X-ray magnetic circular dichroism detects the transient magnetic moments that are induced in a nonmagnetic material by spin injection from a ferromagnet. [Phys. Rev. Lett. 115, 096601] Published Mon Aug 24, 2015

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Casimir forces of metallic microstructures into cavities (2015)

George Kenanakis, Costas M. Soukoulis, and Eleftherios N. Economou

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-20

Description: Author(s): George Kenanakis, Costas M. Soukoulis, and Eleftherios N. Economou A theoretical estimate of the Casimir force of a metallic structure embedded into a cubic cavity is proposed. We demonstrate that by calculating the eigenmodes of the system we can determine the Casimir force, which can be either attractive or repulsive, by simply changing the geometry of the struct… [Phys. Rev. B 92, 075430] Published Wed Aug 19, 2015

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

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Nature of the bias-dependent symmetry reduction of iron phthalocyanine on Cu(111) (2015)

Olesia Snezhkova, Johann Lüder, Alissa Wiengarten, Shiri R. Burema, Felix Bischoff, Yuanqin He, Jan Rusz, Jan Knudsen, Marie-Laure Bocquet, Knud Seufert, Johannes V. Barth, Willi Auwärter, Barbara Brena, and Joachim Schnadt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-20

Description: Author(s): Olesia Snezhkova, Johann Lüder, Alissa Wiengarten, Shiri R. Burema, Felix Bischoff, Yuanqin He, Jan Rusz, Jan Knudsen, Marie-Laure Bocquet, Knud Seufert, Johannes V. Barth, Willi Auwärter, Barbara Brena, and Joachim Schnadt Subtle changes in the geometric and electronic properties of supported molecules, with a potential impact on the functioning of molecular devices, can typically be imaged by scanning probe microscopy, but their exact origin and nature often remain unclear. Here we show explicitly that the symmetry r… [Phys. Rev. B 92, 075428] Published Wed Aug 19, 2015

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

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Thermal properties of black and blue phosphorenes from a first-principles quasiharmonic approach (2015)

Yierpan Aierken, Deniz Çakır, Cem Sevik, and Francois M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-20

Description: Author(s): Yierpan Aierken, Deniz Çakır, Cem Sevik, and Francois M. Peeters Different allotropes of phosphorene are possible of which black and blue phosphorus are the most stable. While blue phosphorus has isotropic properties, black phosphorus is strongly anisotropic in its electronic and optical properties due to its anisotropic crystal structure. In this work, we system… [Phys. Rev. B 92, 081408(R)] Published Wed Aug 19, 2015

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

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Charge transport in DNA nanowires connected to carbon nanotubes (2015)

Bikan Tan, Miroslav Hodak, Wenchang Lu, and J. Bernholc

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-20

Description: Author(s): Bikan Tan, Miroslav Hodak, Wenchang Lu, and J. Bernholc DNA is perhaps the worlds most controllable nanowire, with potential applications in nanoelectronics and sensing. However, understanding of its charge transport (CT) properties remains elusive, with experiments reporting a wide range of behaviors from insulating to superconductive. We report extensi… [Phys. Rev. B 92, 075429] Published Wed Aug 19, 2015

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

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Experimental evidence for non-Abelian gauge potentials in twisted graphene bilayers (2015)

Long-Jing Yin, Jia-Bin Qiao, Wei-Jie Zuo, Wen-Tian Li, and Lin He

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-20

Description: Author(s): Long-Jing Yin, Jia-Bin Qiao, Wei-Jie Zuo, Wen-Tian Li, and Lin He Non-Abelian gauge potentials are quite relevant in subatomic physics, but they are relatively rare in a condensed matter context. Here we report the experimental evidence for non-Abelian gauge potentials in twisted graphene bilayers by scanning tunneling microscopy and spectroscopy. At a magic twist… [Phys. Rev. B 92, 081406(R)] Published Wed Aug 19, 2015

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Multiqubit gates protected by adiabaticity and dynamical decoupling applicable to donor qubits in silicon (2015)

Wayne M. Witzel, Inès Montaño, Richard P. Muller, and Malcolm S. Carroll

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-20

Description: Author(s): Wayne M. Witzel, Inès Montaño, Richard P. Muller, and Malcolm S. Carroll We present a strategy for producing multiqubit gates that promise high fidelity with minimal tuning requirements. Our strategy combines gap protection from the adiabatic theorem with dynamical decoupling in a complementary manner. Energy-level transition errors are protected by adiabaticity and rema… [Phys. Rev. B 92, 081407(R)] Published Wed Aug 19, 2015

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

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Electron-electron interactions in graphene field-induced quantum dots in a high magnetic field (2015)

A. Orlof, A. A. Shylau, and I. V. Zozoulenko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-21

Description: Author(s): A. Orlof, A. A. Shylau, and I. V. Zozoulenko We study the effect of electron-electron interaction in graphene quantum dots defined by an external electrostatic potential and a high magnetic field. To account for the electron-electron interaction, we use the Thomas-Fermi approximation and find that electron screening causes the formation of com… [Phys. Rev. B 92, 075431] Published Thu Aug 20, 2015

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

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The two classes of low-energy spectra in finite carbon nanotubes (2015)

Magdalena Marganska, Piotr Chudzinski, and Milena Grifoni

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-22

Description: Author(s): Magdalena Marganska, Piotr Chudzinski, and Milena Grifoni We study the spectra of finite-length carbon nanotubes (CNTs) of arbitrary chirality. They divide into two classes, which arise because of different rotational symmetries of the low-energy eigenstates. In one of them (the zigzag class), the spinless spectrum is doubly degenerate and the two states c… [Phys. Rev. B 92, 075433] Published Fri Aug 21, 2015

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

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Majorana fermions at the edge of superconducting islands (2015)

R. S. Akzyanov, A. L. Rakhmanov, A. V. Rozhkov, and Franco Nori

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-22

Description: Author(s): R. S. Akzyanov, A. L. Rakhmanov, A. V. Rozhkov, and Franco Nori We investigate the properties of electron states localized at the edge of a superconducting island placed on the surface of a topological insulator in a magnetic field. In such systems, Majorana fermions emerge if an odd number of vortices (or odd multivortex vorticity) is hosted by the island; othe… [Phys. Rev. B 92, 075432] Published Fri Aug 21, 2015

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

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Charge neutrality in epitaxial graphene on 6H-SiC(0001) via nitrogen intercalation (2015)

Nuala M. Caffrey, Rickard Armiento, Rositsa Yakimova, and Igor A. Abrikosov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-22

Description: Author(s): Nuala M. Caffrey, Rickard Armiento, Rositsa Yakimova, and Igor A. Abrikosov The electronic properties of epitaxial graphene grown on SiC(0001) are known to be impaired relative to those of freestanding graphene. This is due to the formation of a carbon buffer layer between the graphene layers and the substrate, which causes the graphene layers to become strongly n -doped. Ch… [Phys. Rev. B 92, 081409(R)] Published Fri Aug 21, 2015

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

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Van Hove singularity and ferromagnetic instability in phosphorene (2015)

A. Ziletti, S. M. Huang, D. F. Coker, and H. Lin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-22

Description: Author(s): A. Ziletti, S. M. Huang, D. F. Coker, and H. Lin Using Wannier-function-based interpolation techniques, we present compelling numerical evidence for the presence of a saddle-point Van Hove singularity at the Γ point near the phosphorene Fermi energy. We show that in proximity of the Van Hove singularity the spin susceptibility presents the logarit… [Phys. Rev. B 92, 085423] Published Fri Aug 21, 2015

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

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Hopping conduction via ionic liquid induced silicon surface states (2015)

J. Nelson, K. V. Reich, M. Sammon, B. I. Shklovskii, and A. M. Goldman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-22

Description: Author(s): J. Nelson, K. V. Reich, M. Sammon, B. I. Shklovskii, and A. M. Goldman In order to clarify the physics of the gating of solids by ionic liquids (ILs) we have gated lightly doped p -Si, which is so well studied that it can be called the “hydrogen atom of solid state physics” and can be used as a test bed for ionic liquids. We explore the case where the concentration of i… [Phys. Rev. B 92, 085424] Published Fri Aug 21, 2015

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

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Accessing Phonon Polaritons in Hyperbolic Crystals by Angle-Resolved Photoemission Spectroscopy (2015)

Andrea Tomadin, Alessandro Principi, Justin C. W. Song, Leonid S. Levitov, and Marco Polini

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-22

Description: Author(s): Andrea Tomadin, Alessandro Principi, Justin C. W. Song, Leonid S. Levitov, and Marco Polini Recently studied hyperbolic materials host unique phonon-polariton (PP) modes. The ultrashort wavelengths of these modes, as well as their low damping, hold promise for extreme subdiffraction nanophotonics schemes. Polar hyperbolic materials such as hexagonal boron nitride can be used to realize lon… [Phys. Rev. Lett. 115, 087401] Published Fri Aug 21, 2015

Keywords: Condensed Matter: Electronic Properties, etc.

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Tracking Primary Thermalization Events in Graphene with Photoemission at Extreme Time Scales (2015)

I. Gierz, F. Calegari, S. Aeschlimann, M. Chávez Cervantes, C. Cacho, R. T. Chapman, E. Springate, S. Link, U. Starke, C. R. Ast, and A. Cavalleri

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-22

Description: Author(s): I. Gierz, F. Calegari, S. Aeschlimann, M. Chávez Cervantes, C. Cacho, R. T. Chapman, E. Springate, S. Link, U. Starke, C. R. Ast, and A. Cavalleri Ultrafast dynamics of photoexcited electron-hole pairs produced by subfemtosecond pulses in graphene may have implications for petahertz electronic and optoelectronic devices. [Phys. Rev. Lett. 115, 086803] Published Fri Aug 21, 2015

Keywords: Condensed Matter: Electronic Properties, etc.

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Evidence for Half-Metallicity in n-type HgCr_{2} Se_{4} (2015)

Tong Guan, Chaojing Lin, Chongli Yang, Youguo Shi, Cong Ren, Yongqing Li, Hongming Weng, Xi Dai, Zhong Fang, Shishen Yan, and Peng Xiong

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-22

Description: Author(s): Tong Guan, Chaojing Lin, Chongli Yang, Youguo Shi, Cong Ren, Yongqing Li, Hongming Weng, Xi Dai, Zhong Fang, Shishen Yan, and Peng Xiong High quality HgCr 2 Se 4 single crystals have been investigated by magnetization, electron transport, and Andreev reflection spectroscopy. In the ferromagnetic ground state, the saturation magnetic moment of each unit cell corresponds to an integer number of electron spins ( 3 μ B / Cr 3 + ), and the Hall ef… [Phys. Rev. Lett. 115, 087002] Published Fri Aug 21, 2015

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Decoherence of Near-Surface Nitrogen-Vacancy Centers Due to Electric Field Noise (2015)

M. Kim, H. J. Mamin, M. H. Sherwood, K. Ohno, D. D. Awschalom, and D. Rugar

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-22

Description: Author(s): M. Kim, H. J. Mamin, M. H. Sherwood, K. Ohno, D. D. Awschalom, and D. Rugar We show that electric field noise from surface charge fluctuations can be a significant source of spin decoherence for near-surface nitrogen-vacancy (NV) centers in diamond. This conclusion is based on the increase in spin coherence observed when the diamond surface is covered with high-dielectric-c… [Phys. Rev. Lett. 115, 087602] Published Fri Aug 21, 2015

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How grain size controls friction and wear in nanocrystalline metals (2015)

Ao Li and Izabela Szlufarska

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-15

Description: Author(s): Ao Li and Izabela Szlufarska Using molecular simulations we investigated the dependence of friction and wear on grain size in nanocrystalline copper. We found that effects of grain size are coupled to the effects of contact size, resulting in a transition from grain size–sensitive regime to grain size–insensitive regime in fric… [Phys. Rev. B 92, 075418] Published Fri Aug 14, 2015

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

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Optical study of a doubly negatively charged exciton in a CdTe/ZnTe quantum dot containing a single Mn ^{2+} ion (2015)

T. Smoleński, M. Koperski, M. Goryca, P. Wojnar, P. Kossacki, and T. Kazimierczuk

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-15

Description: Author(s): T. Smoleński, M. Koperski, M. Goryca, P. Wojnar, P. Kossacki, and T. Kazimierczuk We present a magnetospectroscopic study of a doubly negatively charged exciton X 2 − in a CdTe quantum dot doped with a single Mn 2 + ion. The X 2 − emission leading to the singlet final state of an excited electron pair is demonstrated to consist of six distinct lines corresponding to different projectio… [Phys. Rev. B 92, 085415] Published Thu Aug 13, 2015

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

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Efficient Cluster Algorithm for Spin Glasses in Any Space Dimension (2015)

Zheng Zhu, Andrew J. Ochoa, and Helmut G. Katzgraber

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Zheng Zhu, Andrew J. Ochoa, and Helmut G. Katzgraber Spin systems with frustration and disorder are notoriously difficult to study, both analytically and numerically. While the simulation of ferromagnetic statistical mechanical models benefits greatly from cluster algorithms, these accelerated dynamics methods remain elusive for generic spin-glass-lik… [Phys. Rev. Lett. 115, 077201] Published Fri Aug 14, 2015

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Numerical Evidence of Quantum Melting of Spin Ice: Quantum-to-Classical Crossover (2015)

Yasuyuki Kato and Shigeki Onoda

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Yasuyuki Kato and Shigeki Onoda Unbiased quantum Monte Carlo simulations are performed on the nearest-neighbor spin- 1 2 pyrochlore X X Z model with an antiferromagnetic longitudinal and the weak ferromagnetic transverse exchange couplings, J and J ⊥ . The specific heat exhibits a broad peak at T CSI ∼ 0.2 J associated with a crossover to a… [Phys. Rev. Lett. 115, 077202] Published Fri Aug 14, 2015

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Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy (2015)

M. Schubert, H. Schaefer, J. Mayer, A. Laptev, M. Hettich, M. Merklein, C. He, C. Rummel, O. Ristow, M. Großmann, Y. Luo, V. Gusev, K. Samwer, M. Fonin, T. Dekorsy, and J. Demsar

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): M. Schubert, H. Schaefer, J. Mayer, A. Laptev, M. Hettich, M. Merklein, C. He, C. Rummel, O. Ristow, M. Großmann, Y. Luo, V. Gusev, K. Samwer, M. Fonin, T. Dekorsy, and J. Demsar The origin of the martensitic transition in the magnetic shape memory alloy Ni-Mn-Ga has been widely discussed. While several studies suggest it is electronically driven, the adaptive martensite model reproduced the peculiar nonharmonic lattice modulation. We used femtosecond spectroscopy to probe t… [Phys. Rev. Lett. 115, 076402] Published Thu Aug 13, 2015

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Reconfigurable Quantum-Dot Molecules Created by Atom Manipulation (2015)

Yi Pan, Jianshu Yang, Steven C. Erwin, Kiyoshi Kanisawa, and Stefan Fölsch

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Yi Pan, Jianshu Yang, Steven C. Erwin, Kiyoshi Kanisawa, and Stefan Fölsch Quantum-dot molecules were constructed on a semiconductor surface using atom manipulation by scanning tunneling microscopy (STM) at 5 K. The molecules consist of several coupled quantum dots, each of which comprises a chain of charged adatoms that electrostatically confines intrinsic surface-state e… [Phys. Rev. Lett. 115, 076803] Published Fri Aug 14, 2015

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Tunneling density of states in quantum dots with anisotropic exchange (2015)

A. U. Sharafutdinov and I. S. Burmistrov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-07-30

Description: Author(s): A. U. Sharafutdinov and I. S. Burmistrov We reexamine the tunneling density of states in quantum dots and nanoparticles within the model which is an extension of the universal Hamiltonian to the case of uniaxial anisotropic exchange. We derive the exact analytical result for the tunneling density of states in the case of an arbitrary singl… [Phys. Rev. B 92, 035439] Published Wed Jul 29, 2015

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Interaction of Strain and Nuclear Spins in Silicon: Quadrupolar Effects on Ionized Donors (2015)

David P. Franke, Florian M. Hrubesch, Markus Künzl, Hans-Werner Becker, Kohei M. Itoh, Martin Stutzmann, Felix Hoehne, Lukas Dreher, and Martin S. Brandt

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-07-30

Description: Author(s): David P. Franke, Florian M. Hrubesch, Markus Künzl, Hans-Werner Becker, Kohei M. Itoh, Martin Stutzmann, Felix Hoehne, Lukas Dreher, and Martin S. Brandt The interaction between the nuclear quadrupole moment of Arsenic and an electric field gradient can be manipulated by applying an elastic strain to the host silicon crystal. This technique could allow for mechanical tuning of qubits. [Phys. Rev. Lett. 115, 057601] Published Wed Jul 29, 2015

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Adsorption of alkali adatoms on graphene supported by the Au/Ni(111) surface (2015)

C. S. Praveen, Simone Piccinin, and Stefano Fabris

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-04

Description: Author(s): C. S. Praveen, Simone Piccinin, and Stefano Fabris We study alkali-metal adsorption on supported graphene by means of density-functional-theory calculations that include dispersion corrections. Graphene supported by the Au/Ni(111) surface is an important system for fundamental studies because this surface allows one to support graphene, preserving t… [Phys. Rev. B 92, 075403] Published Mon Aug 03, 2015

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

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Spin-polarized surface electronic structure of Ta(110): Similarities and differences to W(110) (2015)

B. Engelkamp, H. Wortelen, H. Mirhosseini, A. B. Schmidt, D. Thonig, J. Henk, and M. Donath

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-04

Description: Author(s): B. Engelkamp, H. Wortelen, H. Mirhosseini, A. B. Schmidt, D. Thonig, J. Henk, and M. Donath Tantalum and tungsten, direct neighbors in the periodic table, exhibit a very similar electronic structure. Compared with tungsten, however, the bands of tantalum are less occupied due to the lack of one electron. As a consequence, an exceptional Dirac-cone-like surface state, observed below the Fer… [Phys. Rev. B 92, 085401] Published Mon Aug 03, 2015

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

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Graphene-loaded wire medium for tunable broadband subwavelength imaging (2015)

Ali Forouzmand, Hossein M. Bernety, and Alexander B. Yakovlev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-04

Description: Author(s): Ali Forouzmand, Hossein M. Bernety, and Alexander B. Yakovlev In this paper, we demonstrate that a wire medium (WM) slab loaded with graphene sheets enables the enhancement of the near field for subwavelength imaging at terahertz frequencies. The analysis is based on the nonlocal homogenization model for WM with the additional boundary condition at the connect… [Phys. Rev. B 92, 085402] Published Mon Aug 03, 2015

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Large Superconducting Spin Valve Effect and Ultrasmall Exchange Splitting in Epitaxial Rare-Earth-Niobium Trilayers (2015)

Yuanzhou Gu, Gábor B. Halász, J. W. A. Robinson, and M. G. Blamire

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-04

Description: Author(s): Yuanzhou Gu, Gábor B. Halász, J. W. A. Robinson, and M. G. Blamire Epitaxial Ho / Nb / Ho and Dy / Nb / Dy superconducting spin valves show a reversible change in the zero-field critical temperature ( Δ T c 0 ) of ∼ 400 mK and an infinite magnetoresistance on changing the relative magnetization of the Ho or Dy layers. Unlike transition-metal superconducting spin valves, which s… [Phys. Rev. Lett. 115, 067201] Published Mon Aug 03, 2015

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Surface and Step Conductivities on Si(111) Surfaces (2015)

Sven Just, Marcus Blab, Stefan Korte, Vasily Cherepanov, Helmut Soltner, and Bert Voigtländer

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-04

Description: Author(s): Sven Just, Marcus Blab, Stefan Korte, Vasily Cherepanov, Helmut Soltner, and Bert Voigtländer Four-point measurements using a multitip scanning tunneling microscope are carried out in order to determine surface and step conductivities on Si(111) surfaces. In a first step, distance-dependent four-point measurements in the linear configuration are used in combination with an analytical three-l… [Phys. Rev. Lett. 115, 066801] Published Mon Aug 03, 2015

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Linear Scaling of the Exciton Binding Energy versus the Band Gap of Two-Dimensional Materials (2015)

Jin-Ho Choi, Ping Cui, Haiping Lan, and Zhenyu Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-08

Description: Author(s): Jin-Ho Choi, Ping Cui, Haiping Lan, and Zhenyu Zhang The exciton is one of the most crucial physical entities in the performance of optoelectronic and photonic devices, and widely varying exciton binding energies have been reported in different classes of materials. Using first-principles calculations within the G W –Bethe-Salpeter equation approach, he… [Phys. Rev. Lett. 115, 066403] Published Fri Aug 07, 2015

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Strain Induced Vortex Core Switching in Planar Magnetostrictive Nanostructures (2015)

T. A. Ostler, R. Cuadrado, R. W. Chantrell, A. W. Rushforth, and S. A. Cavill

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-08

Description: Author(s): T. A. Ostler, R. Cuadrado, R. W. Chantrell, A. W. Rushforth, and S. A. Cavill The dynamics of magnetic vortex cores is of great interest because the gyrotropic mode has applications in spin torque driven magnetic microwave oscillators, and also provides a means to flip the direction of the core for use in magnetic storage devices. Here, we propose a new means of stimulating m… [Phys. Rev. Lett. 115, 067202] Published Fri Aug 07, 2015

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Line Degeneracy and Strong Spin-Orbit Coupling of Light with Bulk Bianisotropic Metamaterials (2015)

Qinghua Guo, Wenlong Gao, Jing Chen, Yongmin Liu, and Shuang Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-08

Description: Author(s): Qinghua Guo, Wenlong Gao, Jing Chen, Yongmin Liu, and Shuang Zhang Propagation of light in a medium is dictated by equifrequency surfaces (EFSs), which play a similar role as Fermi surfaces for electrons in crystals. Engineering the equifrequency surface of light through structuring a photonic medium enables superior control over light propagation that goes beyond … [Phys. Rev. Lett. 115, 067402] Published Fri Aug 07, 2015

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Tunable Spin-Qubit Coupling Mediated by a Multielectron Quantum Dot (2015)

V. Srinivasa, H. Xu, and J. M. Taylor

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-06

Description: Author(s): V. Srinivasa, H. Xu, and J. M. Taylor We present an approach for entangling electron spin qubits localized on spatially separated impurity atoms or quantum dots via a multielectron, two-level quantum dot. The effective exchange interaction mediated by the dot can be understood as the simplest manifestation of Ruderman-Kittel-Kasuya-Yosi... [Phys. Rev. Lett. 114, 226803] Published Thu Jun 04, 2015

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Many-body Majorana operators and the equivalence of parity sectors (2015)

G. Kells

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-04

Description: Author(s): G. Kells The one-dimensional p -wave topological superconductor model with open-boundary conditions is examined in its topological phase. Using the eigenbasis of the noninteracting system I show that, provided the interactions are local and do not result in a closing of the gap, then even and odd parity secto… [Phys. Rev. B 92, 081401(R)] Published Mon Aug 03, 2015

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

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Threshold displacement energies in graphene and single-walled carbon nanotubes (2015)

Andrew Merrill, Cory D. Cress, Jamie E. Rossi, Nathanael D. Cox, and Brian J. Landi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-04

Description: Author(s): Andrew Merrill, Cory D. Cress, Jamie E. Rossi, Nathanael D. Cox, and Brian J. Landi The threshold displacement energy E d has been determined for graphene and 216 different ( n , m ) single-walled carbon nanotube chiralities, with 5 ≤ n ≤ 20 and 0 ≤ m ≤ n , under several model conditions using classical molecular dynamics. The model conditions vary by particle (electron or carbon ion), empirica… [Phys. Rev. B 92, 075404] Published Mon Aug 03, 2015

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Phosphorene analogues: Isoelectronic two-dimensional group-IV monochalcogenides with orthorhombic structure (2015)

Lídia C. Gomes and A. Carvalho

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): Lídia C. Gomes and A. Carvalho The group-IV monochalcogenides SnS, SnSe, GeS, and GeSe form a family within the wider group of semiconductor “phosphorene analogues.” Here, we used first-principles calculations to investigate systematically their structural, electronic, and optical properties, analyzing the changes associated with… [Phys. Rev. B 92, 085406] Published Thu Aug 06, 2015

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Valley entanglement of excitons in monolayers of transition-metal dichalcogenides (2015)

Mikhail Tokman, Yongrui Wang, and Alexey Belyanin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): Mikhail Tokman, Yongrui Wang, and Alexey Belyanin We show that excitons in K and K ′ valleys of transition metal dichalcogenide monolayers can be entangled with respect to their valley degree of freedom by absorbing linearly polarized single photons. This effect does not require any interaction between K and K ′ excitons in contrast to conventional m… [Phys. Rev. B 92, 075409] Published Fri Aug 07, 2015

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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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Publication Date: 2015-08-08

Description: 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

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Fractional quantum Hall effect in graphene: Quantitative comparison between theory and experiment (2015)

Ajit C. Balram, Csaba Tőke, A. Wójs, and J. K. Jain

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): Ajit C. Balram, Csaba Tőke, A. Wójs, and J. K. Jain The observation of extensive fractional quantum Hall states in graphene brings out the possibility of more accurate quantitative comparisons between theory and experiment than previously possible, because of the negligibility of finite width corrections. We obtain an accurate phase diagram for diffe… [Phys. Rev. B 92, 075410] Published Fri Aug 07, 2015

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Magnetoelectronic properties of multilayer black phosphorus (2015)

Yongjin Jiang, Rafael Roldán, Francisco Guinea, and Tony Low

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-08

Description: Author(s): Yongjin Jiang, Rafael Roldán, Francisco Guinea, and Tony Low We examine the electronic properties of two-dimensional electron gas in black phosphorus multilayers in the presence of a perpendicular magnetic field, highlighting the role of in-plane anisotropy on various experimental quantities such as ac magnetoconductivity, screening, and magnetoplasmons. We f… [Phys. Rev. B 92, 085408] Published Fri Aug 07, 2015

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Theory of spin-orbit-induced spin relaxation in functionalized graphene (2015)

Jan Bundesmann, Denis Kochan, Fedor Tkatschenko, Jaroslav Fabian, and Klaus Richter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Jan Bundesmann, Denis Kochan, Fedor Tkatschenko, Jaroslav Fabian, and Klaus Richter We perform a comparative study of the spin relaxation by spin-orbit coupling induced from adatoms (hydrogen and fluorine) in graphene. Two methods are applied, giving consistent results: a full quantum transport simulation of a graphene nanoribbon, and a T -matrix calculation using Green's functions … [Phys. Rev. B 92, 081403(R)] Published Mon Aug 10, 2015

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Anderson localization and topological transition in Chern insulators (2015)

Eduardo V. Castro, M. Pilar López-Sancho, and María A. H. Vozmediano

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Eduardo V. Castro, M. Pilar López-Sancho, and María A. H. Vozmediano We analyze the topological transition and localization evolution of disordered two-dimensional systems with nontrivial topology based on bipartite lattices. Chern insulators with broken time-reversal symmetry show nonstandard behavior for disorder realizations selectively distributed on only one of … [Phys. Rev. B 92, 085410] Published Mon Aug 10, 2015

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Statistics of heat exchange between two resistors (2015)

D. S. Golubev and J. P. Pekola

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): D. S. Golubev and J. P. Pekola We study energy flow between two resistors coupled by an arbitrary linear and lossless electric circuit. We show that the fluctuations of energy transferred between the resistors are determined by random scattering of photons on an effective barrier with frequency dependent transmission probability … [Phys. Rev. B 92, 085412] Published Mon Aug 10, 2015

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Bright and dark singlet excitons via linear and two-photon spectroscopy in monolayer transition-metal dichalcogenides (2015)

Timothy C. Berkelbach, Mark S. Hybertsen, and David R. Reichman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-11

Description: Author(s): Timothy C. Berkelbach, Mark S. Hybertsen, and David R. Reichman We discuss the linear and two-photon spectroscopic selection rules for spin-singlet excitons in monolayer transition-metal dichalcogenides. Our microscopic formalism combines a fully k -dependent few-orbital band structure with a many-body Bethe-Salpeter equation treatment of the electron-hole intera… [Phys. Rev. B 92, 085413] Published Mon Aug 10, 2015

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Caustic graphene plasmons with Kelvin angle (2015)

Xihang Shi, Xiao Lin, Fei Gao, Hongyi Xu, Zhaoju Yang, and Baile Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-12

Description: Author(s): Xihang Shi, Xiao Lin, Fei Gao, Hongyi Xu, Zhaoju Yang, and Baile Zhang A century-long argument made by Lord Kelvin that all swimming objects have an effective Mach number of 3, corresponding to a Kelvin angle of 19.5° for ship waves, has been challenged recently with the conclusion that the Kelvin angle should gradually transit to the Mach angle as the ship's velocity … [Phys. Rev. B 92, 081404(R)] Published Tue Aug 11, 2015

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Floquet exciton condensation in graphene bilayers (2015)

Chuanyi Zhang, Weifeng Zhang, and Guojun Jin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-15

Description: Author(s): Chuanyi Zhang, Weifeng Zhang, and Guojun Jin We theoretically study the Floquet exciton condensation, which denotes the exciton condensation under an off-resonant circularly polarized light, in graphene bilayers. The polarized light greatly affects the gap function of the condensate as well as the related physical quantities, e.g., the condens… [Phys. Rev. B 92, 085414] Published Thu Aug 13, 2015

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Electronic transport in graphene with particle-hole-asymmetric disorder (2015)

Max Hering, Martin Schneider, and Piet W. Brouwer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-15

Description: Author(s): Max Hering, Martin Schneider, and Piet W. Brouwer We study the conductivity of graphene with a smooth but particle-hole-asymmetric disorder potential. Using perturbation theory for the weak-disorder regime and numerical calculations, we investigate how the particle-hole asymmetry shifts the position of the minimal conductivity away from the Dirac p… [Phys. Rev. B 92, 075415] Published Thu Aug 13, 2015

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Dirac electrons and domain walls: A realization in junctions of ferromagnets and topological insulators (2015)

Yago Ferreiros, F. J. Buijnsters, and M. I. Katsnelson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-15

Description: Author(s): Yago Ferreiros, F. J. Buijnsters, and M. I. Katsnelson We study a system of Dirac electrons with finite density of charge carriers coupled to an external electromagnetic field in two spatial dimensions, with a domain wall (DW) mass term. The interface between a thin-film ferromagnet and a three-dimensional topological insulator provides a condensed-matt… [Phys. Rev. B 92, 085416] Published Thu Aug 13, 2015

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Helical Spin Order from Topological Dirac and Weyl Semimetals (2015)

Xiao-Qi Sun, Shou-Cheng Zhang, and Zhong Wang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Xiao-Qi Sun, Shou-Cheng Zhang, and Zhong Wang We study dynamical mass generation and the resultant helical spin orders in topological Dirac and Weyl semimetals, including the edge states of quantum spin Hall insulators, the surface states of weak topological insulators, and the bulk materials of Weyl semimetals. In particular, the helical spin … [Phys. Rev. Lett. 115, 076802] Published Thu Aug 13, 2015

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Origin of the Anomalous Mass Renormalization in Metallic Quantum Well States of Strongly Correlated Oxide SrVO_{3} (2015)

Masaki Kobayashi, Kohei Yoshimatsu, Enju Sakai, Miho Kitamura, Koji Horiba, Atsushi Fujimori, and Hiroshi Kumigashira

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Masaki Kobayashi, Kohei Yoshimatsu, Enju Sakai, Miho Kitamura, Koji Horiba, Atsushi Fujimori, and Hiroshi Kumigashira In situ angle-resolved photoemission spectroscopy (ARPES) has been performed on SrVO 3 ultrathin films, which show metallic quantum well (QW) states, to unveil the origin of the anomalous mass enhancement in the QW subbands. The line-shape analysis of the ARPES spectra reveals that the strength of th… [Phys. Rev. Lett. 115, 076801] Published Thu Aug 13, 2015

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Anderson Localization and the Quantum Phase Diagram of Three Dimensional Disordered Dirac Semimetals (2015)

J. H. Pixley, Pallab Goswami, and S. Das Sarma

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-12

Description: Author(s): J. H. Pixley, Pallab Goswami, and S. Das Sarma We study the quantum phase diagram of a three dimensional noninteracting Dirac semimetal in the presence of either quenched axial or scalar potential disorder, by calculating the average and the typical density of states as well as the inverse participation ratio using numerically exact methods. We … [Phys. Rev. Lett. 115, 076601] Published Tue Aug 11, 2015

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Uniformity of the pseudomagnetic field in strained graphene (2015)

G. J. Verbiest, S. Brinker, and C. Stampfer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-15

Description: Author(s): G. J. Verbiest, S. Brinker, and C. Stampfer We present a numerical study on the uniformity of the pseudomagnetic field in graphene as a function of the relative orientation between the graphene lattice and straining directions. We calculated the deformation of a regular micron-sized graphene hexagon by symmetrically displacing three of its ed… [Phys. Rev. B 92, 075417] Published Fri Aug 14, 2015

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Arsenic-bridged magnetic interactions in an emerging two-dimensional FeAs nanostructure on MnAs (2015)

Christian Helman, Valeria Ferrari, and Ana Maria Llois

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-15

Description: Author(s): Christian Helman, Valeria Ferrari, and Ana Maria Llois The extreme case of an Fe monolayer deposited onto a manganese arsenide (MnAs) substrate is analyzed using density functional theory. We find that an FeAs quasi-two-dimensional antiferromagnetic surface nanostructure emerges. This nanostructure, which is magnetically nearly decoupled from the substr… [Phys. Rev. B 92, 075416] Published Thu Aug 13, 2015

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

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Spin Hall Effects Due to Phonon Skew Scattering (2015)

Cosimo Gorini, Ulrich Eckern, and Roberto Raimondi

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Cosimo Gorini, Ulrich Eckern, and Roberto Raimondi A diversity of spin Hall effects in metallic systems is known to rely on Mott skew scattering. In this work its high-temperature counterpart, phonon skew scattering, which is expected to be of foremost experimental relevance, is investigated. In particular, the phonon skew scattering spin Hall condu… [Phys. Rev. Lett. 115, 076602] Published Fri Aug 14, 2015

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Candidate Source of Flux Noise in SQUIDs: Adsorbed Oxygen Molecules (2015)

Hui Wang, Chuntai Shi, Jun Hu, Sungho Han, Clare C. Yu, and R. Q. Wu

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Hui Wang, Chuntai Shi, Jun Hu, Sungho Han, Clare C. Yu, and R. Q. Wu A major obstacle to using superconducting quantum interference devices (SQUIDs) as qubits is flux noise. We propose that the heretofore mysterious spins producing flux noise could be O 2 molecules adsorbed on the surface. Using density functional theory calculations, we find that an O 2 molecule adsor… [Phys. Rev. Lett. 115, 077002] Published Fri Aug 14, 2015

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Controlled Strong Coupling and Absence of Dark Polaritons in Microcavities with Double Quantum Wells (2015)

K. Sivalertporn and E. A. Muljarov

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): K. Sivalertporn and E. A. Muljarov We demonstrate an efficient switching between strong and weak exciton-photon coupling regimes in microcavity-embedded asymmetric double quantum wells, controlled by an applied electric field. We show that a fine-tuning of the electric field leads to drastic changes in the polariton properties, with … [Phys. Rev. Lett. 115, 077401] Published Fri Aug 14, 2015

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83

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Gigantic Surface Lifetime of an Intrinsic Topological Insulator (2015)

Madhab Neupane, Su-Yang Xu, Yukiaki Ishida, Shuang Jia, Benjamin M. Fregoso, Chang Liu, Ilya Belopolski, Guang Bian, Nasser Alidoust, Tomasz Durakiewicz, Victor Galitski, Shik Shin, Robert J. Cava, and M. Zahid Hasan

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-10

Description: Author(s): Madhab Neupane, Su-Yang Xu, Yukiaki Ishida, Shuang Jia, Benjamin M. Fregoso, Chang Liu, Ilya Belopolski, Guang Bian, Nasser Alidoust, Tomasz Durakiewicz, Victor Galitski, Shik Shin, Robert J. Cava, and M. Zahid Hasan Exceptionally long-lived excited surface states are found in the topological insulator Bi 2 Te 2 Se, with the state persisting for microseconds. [Phys. Rev. Lett. 115, 116801] Published Wed Sep 09, 2015

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84

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Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe (2015)

Rong Yu and Qimiao Si

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-10

Description: Author(s): Rong Yu and Qimiao Si Motivated by the properties of the iron chalcogenides, we study the phase diagram of a generalized Heisenberg model with frustrated bilinear-biquadratic interactions on a square lattice. We identify zero-temperature phases with antiferroquadrupolar and Ising-nematic orders. The effects of quantum fl… [Phys. Rev. Lett. 115, 116401] Published Tue Sep 08, 2015

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85

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Superconducting Fluctuations in the Normal State of the Two-Dimensional Hubbard Model (2015)

Xi Chen, J. P. F. Le; Blanc, and Emanuel Gull

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-10

Description: Author(s): Xi Chen, J. P. F. LeBlanc, and Emanuel Gull We compute the two-particle quantities relevant for superconducting correlations in the two-dimensional Hubbard model within the dynamical cluster approximation. In the normal state we identify the parameter regime in density, interaction, and second-nearest-neighbor hopping strength that maximizes … [Phys. Rev. Lett. 115, 116402] Published Wed Sep 09, 2015

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86

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Bosonic Integer Quantum Hall Effect in Optical Flux Lattices (2015)

A. Sterdyniak, Nigel R. Cooper, and N. Regnault

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-11

Description: Author(s): A. Sterdyniak, Nigel R. Cooper, and N. Regnault In two dimensions strongly interacting bosons in a magnetic field can realize a bosonic integer quantum Hall state, the simplest two-dimensional example of a symmetry-protected topological phase. We propose a realistic implementation of this phase using an optical flux lattice. Through exact diagona… [Phys. Rev. Lett. 115, 116802] Published Thu Sep 10, 2015

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87

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Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor Junctions (2015)

Petra Högl, Alex Matos-Abiague, Igor Žutić, and Jaroslav Fabian

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-11

Description: Author(s): Petra Högl, Alex Matos-Abiague, Igor Žutić, and Jaroslav Fabian Andreev reflection spectroscopy of ferromagnet-supercondutor (FS) junctions is an important probe of spin polarization. We theoretically investigate spin-polarized transport in FS junctions in the presence of Rashba and Dresselhaus interfacial spin-orbit fields and show that Andreev reflection can b… [Phys. Rev. Lett. 115, 116601] Published Thu Sep 10, 2015

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88

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Bosonic Integer Quantum Hall Effect in an Interacting Lattice Model (2015)

Yin-Chen He, Subhro Bhattacharjee, R. Moessner, and Frank Pollmann

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-11

Description: Author(s): Yin-Chen He, Subhro Bhattacharjee, R. Moessner, and Frank Pollmann We study a bosonic model with correlated hopping on a honeycomb lattice, and show that its ground state is a bosonic integer quantum Hall (BIQH) phase, a prominent example of a symmetry-protected topological (SPT) phase. By using the infinite density matrix renormalization group method, we establish… [Phys. Rev. Lett. 115, 116803] Published Thu Sep 10, 2015

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89

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Electromagnetic force on structured metallic surfaces (2015)

Andrew H. Velzen and Kevin J. Webb

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-12

Description: Author(s): Andrew H. Velzen and Kevin J. Webb We present a method by which the relatively weak electromagnetic force exerted on a surface can be dramatically enhanced. By structuring a metal surface at the nanoscale, we show that the force can be substantially increased over that on the planar metallic surface. The basis for this effect is foun… [Phys. Rev. B 92, 115416] Published Fri Sep 11, 2015

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

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90

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Periodic arrays of intercalated atoms in twisted bilayer graphene: An ab initio investigation (2015)

R. H. Miwa, P. Venezuela, and Eric Suárez Morell

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-12

Description: Author(s): R. H. Miwa, P. Venezuela, and Eric Suárez Morell We have performed an ab initio investigation of transition metals ( TMs = Mo , Ru , Co , and Pt ) embedded in twisted bilayer graphene (tBG) layers. Our total energy results reveal that, triggered by the misalignment between the graphene layers, Mo and Ru atoms may form a quasiperiodic (triangular) array of in… [Phys. Rev. B 92, 115419] Published Fri Sep 11, 2015

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

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91

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Monolayer charge-neutral graphene on platinum with extremely weak electron-phonon coupling (2015)

Wei Yao, Eryin Wang, Ke Deng, Shuzhen Yang, Wenyun Wu, Alexei V. Fedorov, Sung-Kwan Mo, Eike F. Schwier, Mingtian Zheng, Yohei Kojima, Hideaki Iwasawa, Kenya Shimada, Kaili Jiang, Pu Yu, Jia Li, and Shuyun Zhou

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-12

Description: Author(s): Wei Yao, Eryin Wang, Ke Deng, Shuzhen Yang, Wenyun Wu, Alexei V. Fedorov, Sung-Kwan Mo, Eike F. Schwier, Mingtian Zheng, Yohei Kojima, Hideaki Iwasawa, Kenya Shimada, Kaili Jiang, Pu Yu, Jia Li, and Shuyun Zhou Epitaxial growth of graphene on transition metal substrates is an important route for obtaining large scale graphene. However, the interaction between graphene and the substrate often leads to multiple orientations, distorted graphene band structure, large doping, and strong electron-phonon coupling… [Phys. Rev. B 92, 115421] Published Fri Sep 11, 2015

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

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92

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Effect of gate voltage on spin transport along α-helical protein (2015)

Ting-Rui Pan, Ai-Min Guo, and Qing-Feng Sun

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-12

Description: Author(s): Ting-Rui Pan, Ai-Min Guo, and Qing-Feng Sun Recently, the chiral-induced spin selectivity in molecular systems has attracted extensive interest among the scientific communities. Here, we investigate the effect of the gate voltage on spin-selective electron transport through the α -helical peptide/protein molecule contacted by two nonmagnetic e… [Phys. Rev. B 92, 115418] Published Fri Sep 11, 2015

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

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93

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Deeper insight into phase relations in ultrathin Pb films (2015)

Ro-Ya Liu, Angus Huang, Chien-Chung Huang, Chang-Yeh Lee, Chung-Huang Lin, Cheng-Maw Cheng, Ku-Ding Tsuei, Horng-Tay Jeng, Iwao Matsuda, and S.-J. Tang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-12

Description: Author(s): Ro-Ya Liu, Angus Huang, Chien-Chung Huang, Chang-Yeh Lee, Chung-Huang Lin, Cheng-Maw Cheng, Ku-Ding Tsuei, Horng-Tay Jeng, Iwao Matsuda, and S.-J. Tang Films of Pb ( 111 ) with thickness ranging from 1 to 16 monolayers (ML) were grown on Ge ( 111 ) and examined by angle-resolved photoemission spectroscopy. The measured thickness dependences of the work function and surface energy from the same set of samples were both well described by damped sinusoidal … [Phys. Rev. B 92, 115415] Published Fri Sep 11, 2015

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

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94

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Direct imaging of coherent quantum transport in graphene p−n−p junctions (2015)

E. D. Herbschleb, R. K. Puddy, P. Marconcini, J. P. Griffiths, G. A. C. Jones, M. Macucci, C. G. Smith, and M. R. Connolly

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-12

Description: Author(s): E. D. Herbschleb, R. K. Puddy, P. Marconcini, J. P. Griffiths, G. A. C. Jones, M. Macucci, C. G. Smith, and M. R. Connolly We use electrostatic lithography to fabricate a graphene p-n-p junction and exploit the coherence of weakly confined Dirac quasiparticles to image the underlying scattering potential using low-temperature scanning gate microscopy. The tip-induced perturbation to the junction potential modifies the c… [Phys. Rev. B 92, 125414] Published Fri Sep 11, 2015

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

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95

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Waveguiding by a locally resonant metasurface (2015)

A. A. Maznev and V. E. Gusev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-15

Description: Author(s): A. A. Maznev and V. E. Gusev Dispersion relations for acoustic and electromagnetic waves guided by resonant inclusions located at the surface of an elastic solid or an interface between two media are analyzed theoretically within the effective medium approximation. Oscillators on the surface of an elastic half-space are shown t… [Phys. Rev. B 92, 115422] Published Mon Sep 14, 2015

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

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96

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Intervalley biexcitons and many-body effects in monolayer MoS_{2} (2015)

Edbert J. Sie, Alex J. Frenzel, Yi-Hsien Lee, Jing Kong, and Nuh Gedik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-15

Description: Author(s): Edbert J. Sie, Alex J. Frenzel, Yi-Hsien Lee, Jing Kong, and Nuh Gedik Interactions between two excitons can result in the formation of bound quasiparticles, known as biexcitons. Their properties are determined by the constituent excitons, with orbital and spin states resembling those of atoms. Monolayer transition metal dichalcogenides (TMDs) present a unique system w… [Phys. Rev. B 92, 125417] Published Mon Sep 14, 2015

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

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97

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Magnetic field control of near-field radiative heat transfer and the realization of highly tunable hyperbolic thermal emitters (2015)

E. Moncada-Villa, V. Fernández-Hurtado, F. J. García-Vidal, A. García-Martín, and J. C. Cuevas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-15

Description: Author(s): E. Moncada-Villa, V. Fernández-Hurtado, F. J. García-Vidal, A. García-Martín, and J. C. Cuevas We present a comprehensive theoretical study of the magnetic field dependence of the near-field radiative heat transfer (NFRHT) between two parallel plates. We show that when the plates are made of doped semiconductors, the near-field thermal radiation can be severely affected by the application of … [Phys. Rev. B 92, 125418] Published Mon Sep 14, 2015

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

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98

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Semiconductor-Nanowire-Based Superconducting Qubit (2015)

T. W. Larsen, K. D. Petersson, F. Kuemmeth, T. S. Jespersen, P. Krogstrup, J. Nygård, and C. M. Marcus

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-15

Description: Author(s): T. W. Larsen, K. D. Petersson, F. Kuemmeth, T. S. Jespersen, P. Krogstrup, J. Nygård, and C. M. Marcus A qubit made of a semiconducting nanowire sandwiched between two superconductors could simplify the design of quantum information processing architectures. [Phys. Rev. Lett. 115, 127001] Published Mon Sep 14, 2015

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99

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Theory of reflectivity properties of graphene-coated material plates (2015)

G. L. Klimchitskaya, C. C. Korikov, and V. M. Petrov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-16

Description: Author(s): G. L. Klimchitskaya, C. C. Korikov, and V. M. Petrov The theoretical description for the reflectivity properties of dielectric, metal, and semiconductor plates coated with graphene is developed in the framework of the Dirac model. Graphene is described by the polarization tensor allowing the analytic continuation to the real frequency axis. The plate … [Phys. Rev. B 92, 125419] Published Tue Sep 15, 2015

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100

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Prediction of a two-dimensional crystalline structure of nitrogen atoms (2015)

V. Ongun Özçelik, O. Üzengi Aktürk, E. Durgun, and S. Ciraci

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-09-16

Description: Author(s): V. Ongun Özçelik, O. Üzengi Aktürk, E. Durgun, and S. Ciraci Based on first-principles density functional calculations, we predict that nitrogen atoms can form a single-layer, buckled honeycomb structure called nitrogene, which is rigid and stable even above room temperature. This 2D crystalline phase of nitrogen, which corresponds to a local minimum in the B… [Phys. Rev. B 92, 125420] Published Tue Sep 15, 2015

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

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