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Quantitative Entwicklung von Flachseen in Brandenburg im Klimawandel (2014)

Kaden, S. ; Schramm, M.

In: Kaden, S., Dietrich, O., Theobald, S. (Hrsg.). Wassermanagement im Klimawandel – Möglichkeiten und Grenzen von Anpassungsmaßnahmen. Berlin: oekom in Erscheinen

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Publikationsdatum: 2014

Beschreibung: Teilergebnise des BMBF-Verbundforschungsprojektes INKA BB, des TP 22 „Nachhaltige Managementstrategien für glaziale Seen Brandenburgs im Klimawandel“. Ergebnisse aus Berechnungen mit dem NA-Modell EGMO-D für STAR2-Szenarion mit 0 und 2K Temperaturanstieg zur Wasserstandsentwicklung von Flachseen im Raum Brandenburg KATASTER-BESCHREIBUNG: Absenkung der Seewasserspiegel im Extremfall um mehrere Meter, am größten in den Seen im Südosten Berlins und nehmen zum Nordwesten ab, Zunahme der Absenkungen ist am stärksten für Seen, welche im Vergleich zum Zufluss ein großes Volumen besitzen KATASTER-DETAIL: Tmit für (ECAHM, A1B, STAR 0.0T, d.h. T1 0.0 ... kein weiterer Temperaturanstieg nach 2000 und STAR 2.0K, d.h. T2.0 ... weiterer Temperaturanstieg nach 2000 um ca. 2K bis 2060), bis zum Jahr 2018 Stationarität des Füllungsregimes, erst danach Absenkungen zu erwarten Tmit (0K und 2K), von 0,5 m im Jahr 2018 bis auf 4,2 m im Jahr 2053, diejenigen mit 10% Überschreitungswahrscheinlichkeit von 0,4 m bis auf 2,4 m

Schlagwort(e): Nordostdeutschland ; Szenarien 2004-2053 ; Korrelationsmethode ; Niederschlag ; Temperatur ; Verdunstung ; Abfluss ; Grundwasser

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Auswirkungen potenzieller Änderungen des Klimas und der Braunkohleförderung und -verstromung auf natürliche und bewirtschaftete Abflüsse in den Lausitzer Flusseinzugsgebieten (2014)

Pohle, I., Gädeke, A., Koch, H., Grünewald, U., Schramm, M., Redetzky, M., Müller, F., Kaltofen, M.

In: Kaden, S., Dietrich, O., Theobald, S. (Hrsg.). Wassermanagement im Klimawandel – Möglichkeiten und Grenzen von Anpassungsmaßnahmen. München: oekom verlag, 2014, S. 121-140

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Publikationsdatum: 2014

Beschreibung: Ergebnisse von Simulationen der potenziellen zukünftigen natürlichen bzw. bewirtschafteten Abflüsse auf Basis der hydrologischen Modelle SWIM, EGMO, WaSiM-ETH und HBV-light bzw. des Langfristbewirtschaftungsmodells WBalMo für Klimaszenarien von STAR (weiterer Temperaturanstieg um 0 K, 2 K bzw. 3 K) sowie WettReg A1B und eines Szenarios zur Braunkohleförderung und -verstromung (Rückgang des Grundwasserabsenkungsgebiets und der Sümpfungswassereinleitung) KATASTER-BESCHREIBUNG: Rückgang der mittleren natürlichen und bewirtschafteten Abflüsse aufgrund steigender Temperaturen (und der potenziellen Evapotranspiration) sowie teilweise Rückgang der Niederschläge Bei den natürlichen Abflüssen sind die Effekte des Rückgangs des Grundwasserabsenkungsgebiets und der damit verbundenen Vergrößerung der abflusswirksamen Fläche geringer als die Auswirkungen der klimatischen Änderungen. Unsicherheiten der Ergebnisse sowohl aufgrund der Wahl des Klimaszenarios als auch des hydrologischen Modells KATASTER-DETAIL: Delte T (STAR 0K, : 2013-53 vs. 1961-1990) leichter Anstieg der natürlichen Abflüsse durch Rückgang des Grundwasserabsenkungsgebiets; jedoch Rückgang im Vergleich zur Referenzperiode um bis zu 20 % Delte T (STAR 2K, STAR 3K und WettReg A1B: Rückgang der natürlichen Abflüsse im Verlauf des Szenariozeitraums, dabei Rückgang der mittleren Abflüsse (MQ)m Vergleich zur Referenzperiode um bis zu 40 % (STAR 2K) bzw. 50 % (STAR 3K und WettReg A1B), dieser Effekt wird zum Teil durch Rückgang des Grundwasserabsenkungsgebiets gemildert. Bewirtschaftete Abflüsse STAR 0K: z.T. Anstieg bis 2030 STAR 2K, STAR 3K: deutlicher Rückgang ab 2030

Schlagwort(e): Lausitz ; 2013-2053 ; Klima ; Niederschlag ; Temperatur ; Abfluss ; Grundwasser ; Modell

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High-fidelity quantum memory utilizing inhomogeneous nuclear polarization in a quantum dot (2014)

Wenkui Ding, Anqi Shi, J. Q. You, and Wenxian Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Wenkui Ding, Anqi Shi, J. Q. You, and Wenxian Zhang We numerically investigate the encoding and retrieval processes for quantum memory realized in a semiconductor quantum dot by focusing on the effect of inhomogeneously polarized nuclear spins whose polarization depends on the local hyperfine coupling strength. We find that the performance of quantum... [Phys. Rev. B 90, 235421] Published Thu Dec 11, 2014

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

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Thema: Physik

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Effect of hole doping on the magnetism of point defects in graphene: A theoretical study (2014)

Felix Yndurain

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Felix Yndurain Using ab initio methods based on the density functional theory, we study the magnetic properties of different point defects in graphene. We consider separately, atomic hydrogen, atomic fluorine, and single vacancies. The three defects have completely different magnetic properties. A local spin one-h... [Phys. Rev. B 90, 245420] Published Thu Dec 11, 2014

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

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Interaction of localized surface plasmons with chiral molecules (2014)

T. J. Davis and D. E. Gómez

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): T. J. Davis and D. E. Gómez A complete theoretical methodology of the interactions between chiral molecules and the evanescent fields of localized surface plasmons generated in a metallic nanostructure of arbitrary shape. The calculations confirm various previous results on the enhancement of the absorption of light and subsequent circular dichroism by surface plasmons. They also predict a chirality-dependent absorption arising from the metallic nanostructure illuminated with linearly polarized light. [Phys. Rev. B 90, 235424] Published Mon Dec 15, 2014

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

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6

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Time reversal symmetry broken fractional topological phases at zero magnetic field (2014)

Tobias Meng and Eran Sela

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Tobias Meng and Eran Sela We extend the coupled-wire construction of quantum Hall phases, and search for fractional topological insulating states in models of weakly coupled wires at zero external magnetic field. Focusing on systems beyond double copies of fractional quantum Hall states at opposite fields, we find that spin-... [Phys. Rev. B 90, 235425] Published Mon Dec 15, 2014

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

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7

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Topographic measurement of buried thin-film interfaces using a grazing resonant soft x-ray scattering technique (2014)

Eliot Gann, Anne Watson, John R. Tumbleston, Justin Cochran, Hongping Yan, Cheng Wang, Jaewook Seok, Michael Chabinyc, and Harald Ade

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Eliot Gann, Anne Watson, John R. Tumbleston, Justin Cochran, Hongping Yan, Cheng Wang, Jaewook Seok, Michael Chabinyc, and Harald Ade The internal structures of thin films, particularly interfaces between different materials, are critical to system properties and performance across many disciplines, but characterization of buried interface topography is often unfeasible. In this work, we demonstrate that grazing resonant soft x-ra... [Phys. Rev. B 90, 245421] Published Mon Dec 15, 2014

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

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8

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Spin-polarized dynamic transport in tubular two-dimensional electron gases (2014)

E. A. Rothstein, B. Horovitz, O. Entin-Wohlman, and A. Aharony

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): E. A. Rothstein, B. Horovitz, O. Entin-Wohlman, and A. Aharony The ac conductance of a finite tubular two-dimensional electron gas is studied in the presence of the Rashba spin-orbit interaction. When the tube is coupled to two reservoirs, that interaction splits the steps in the dc current, introducing energy ranges with spin-polarized currents. For this setup... [Phys. Rev. B 90, 245425] Published Wed Dec 17, 2014

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

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9

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Spectrum of edge states in the ν=0 quantum Hall phases in graphene (2014)

P. K. Pyatkovskiy and V. A. Miransky

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): P. K. Pyatkovskiy and V. A. Miransky Edge excitations of the ν=0 quantum Hall state in monolayer graphene are studied within the mean-field theory with different symmetry-breaking terms. The analytical expressions for the continuum (Dirac) model wave functions are obtained for the charge density wave, Kekulé distortion, ferromagnetic, ... [Phys. Rev. B 90, 195407] Published Thu Nov 06, 2014

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

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10

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Solid-state dewetting with a magic thickness: Electronic dewetting (2014)

Anna Chame and Olivier Pierre-Louis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Anna Chame and Olivier Pierre-Louis We investigate the dewetting dynamics of ultrathin solid metal films. In these films, quantum confinement of electrons is known to produce a complex wetting potential, leading to “magic thicknesses” which are strongly favored energetically. We introduce a kinetic Monte Carlo model which accounts for... [Phys. Rev. B 90, 195408] Published Fri Nov 07, 2014

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

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First-principles and spectroscopic studies of Bi(110) films: Thickness-dependent Dirac modes and property oscillations (2014)

G. Bian, X. Wang, T. Miller, T.-C. Chiang, P. J. Kowalczyk, O. Mahapatra, and S. A. Brown

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): G. Bian, X. Wang, T. Miller, T.-C. Chiang, P. J. Kowalczyk, O. Mahapatra, and S. A. Brown The electronic structure of Bi(110) thin films as a function of film thickness is investigated by first-principles calculations, angle-resolved photoemission spectroscopy, and scanning tunneling microscopy. Energy minimization in the calculation reveals significant atomic relaxation and rebonding at... [Phys. Rev. B 90, 195409] Published Fri Nov 07, 2014

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

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12

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Magnetic field spectral crossings of Luttinger holes in quantum wells (2014)

G. E. Simion and Y. B. Lyanda-Geller

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): G. E. Simion and Y. B. Lyanda-Geller We develop an analytic approach to two-dimensional (2D) holes in a magnetic field that allows us to gain insight into physics of measuring the parameters of holes, such as cyclotron resonance, Shubnikov-de Haas effect and spin resonance. We derive hole energies, cyclotron masses, and the g factors i... [Phys. Rev. B 90, 195410] Published Fri Nov 07, 2014

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

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13

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Density of states at disorder-induced phase transitions in a multichannel Majorana wire (2014)

Maria-Theresa Rieder and Piet W. Brouwer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Maria-Theresa Rieder and Piet W. Brouwer An N-channel spinless p-wave superconducting wire is known to go through a series of N topological phase transitions upon increasing the disorder strength. Here, we show that at each of those transitions the density of states shows a Dyson singularity ν(ɛ)∝ɛ−1|lnɛ|−3, whereas ν(ɛ)∝ɛ|α|−1 has a power... [Phys. Rev. B 90, 205404] Published Fri Nov 07, 2014

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

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14

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Optical tracing of multiple charges in single-electron devices (2014)

Sanli Faez, Sense Jan van der Molen, and Michel Orrit

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Sanli Faez, Sense Jan van der Molen, and Michel Orrit Single molecules that exhibit narrow optical transitions at cryogenic temperatures can be used as local electric-field sensors. We derive the single-charge sensitivity of aromatic organic dye molecules, based on quantum mechanical considerations. Through numerical modeling, we demonstrate that by us... [Phys. Rev. B 90, 205405] Published Fri Nov 07, 2014

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

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15

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Structural analysis of the intermetallic surface compound CePt5/Pt(111) (2014)

Jeannette Kemmer, Christian Praetorius, Andreas Krönlein, Pin-Jui Hsu, Kai Fauth, and Matthias Bode

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): Jeannette Kemmer, Christian Praetorius, Andreas Krönlein, Pin-Jui Hsu, Kai Fauth, and Matthias Bode We report on a detailed low-energy electron diffraction (LEED) and low-temperature scanning tunneling microscopy (STM) study of the intermetallic surface compound CePt5 on Pt(111). Depending on the thickness we observe various diffraction patterns and superstructures. In the low-thickness regime a s... [Phys. Rev. B 90, 195401] Published Mon Nov 03, 2014

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

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16

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Determining whether metals nucleate homogeneously on graphite: A case study with copper (2014)

David Appy, Huaping Lei, Yong Han, Cai-Zhuang Wang, Michael C. Tringides, Dahai Shao, Emma J. Kwolek, J. W. Evans, and P. A. Thiel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): David Appy, Huaping Lei, Yong Han, Cai-Zhuang Wang, Michael C. Tringides, Dahai Shao, Emma J. Kwolek, J. W. Evans, and P. A. Thiel We observe that Cu clusters grow on surface terraces of graphite as a result of physical vapor deposition in ultrahigh vacuum. We show that the observation is incompatible with a variety of models incorporating homogeneous nucleation and calculations of atomic-scale energetics. An alternative explan... [Phys. Rev. B 90, 195406] Published Wed Nov 05, 2014

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

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17

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Current noise cross correlation mediated by Majorana bound states (2014)

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

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Hai-Feng Lü, Hai-Zhou Lu, and Shun-Qing Shen We study the transport properties of a quantum dot-Majorana hybrid system, in which each of the paired Majorana bound states is connected to one quantum dot. With the help of the nonequilibrium Green's function method, we obtain an exact solution of the Green's functions and calculate the currents t... [Phys. Rev. B 90, 195404] Published Wed Nov 05, 2014

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

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18

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Identifying the absolute orientation of a low-symmetry surface in real space (2014)

Stefan Kuhn, Markus Kittelmann, Yoshiaki Sugimoto, Masayuki Abe, Angelika Kühnle, and Philipp Rahe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Stefan Kuhn, Markus Kittelmann, Yoshiaki Sugimoto, Masayuki Abe, Angelika Kühnle, and Philipp Rahe We present atomic-scale force interaction data acquired on an insulating low-symmetry substrate, namely the calcite(10.4) surface. A pronounced asymmetry of the imaged species is apparent along the vertical axis, which will be identified as a tilted band of purely attractive short-range interaction ... [Phys. Rev. B 90, 195405] Published Wed Nov 05, 2014

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

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Analysis of island shape evolution from diffuse x-ray scattering of organic thin films and implications for growth (2014)

C. Frank, R. Banerjee, M. Oettel, A. Gerlach, J. Novák, G. Santoro, and F. Schreiber

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): C. Frank, R. Banerjee, M. Oettel, A. Gerlach, J. Novák, G. Santoro, and F. Schreiber Understanding the growth of organic semiconducting molecules with shape anisotropy is of high relevance to the processing of optoelectronic devices. This work provides insight into the growth of thin films of the prototypical rodlike organic semiconductor diindenoperylene on a microscopic level by a... [Phys. Rev. B 90, 205401] Published Wed Nov 05, 2014

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

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Renormalization of nanoparticle polarizability in the vicinity of a graphene-covered interface (2014)

Jaime E. Santos, M. I. Vasilevskiy, N. M. R. Peres, G. Smirnov, and Yu. V. Bludov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Jaime E. Santos, M. I. Vasilevskiy, N. M. R. Peres, G. Smirnov, and Yu. V. Bludov We study the electromagnetic properties of a metamaterial consisting of polarizable (nano)particles and a single graphene sheet placed at the interface between two dielectrics. We show that the particle's polarizability is renormalized because of the electromagnetic coupling to surface plasmons supp... [Phys. Rev. B 90, 235420] Published Thu Dec 11, 2014

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

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21

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Rashba spin splitting of Shockley surface states on semi-infinite crystals (2014)

H. Ishida

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): H. Ishida We study the Rashba spin splitting of the L-gap surface state on the (111) surfaces of Au, Ag, and Cu, and that of the topologically protected surface state on Sb(111) by a first-principles calculation based on the embedded Green's function technique. By taking advantage of semi-infinite surface geo... [Phys. Rev. B 90, 235422] Published Mon Dec 15, 2014

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

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22

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Integer and half-integer quantum Hall effect in silicene: Influence of an external electric field and impurities (2014)

Kh. Shakouri, P. Vasilopoulos, V. Vargiamidis, and F. M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Kh. Shakouri, P. Vasilopoulos, V. Vargiamidis, and F. M. Peeters The influence of silicene's strong spin-orbit interaction and of an external electric field E z on the transport coefficients are investigated in the presence of a perpendicular magnetic field B. For finite E z the spin and valley degeneracy of the Landau levels is lifted and leads to additional plate... [Phys. Rev. B 90, 235423] Published Mon Dec 15, 2014

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Weak localization and spin-orbit interaction in side-gate field effect devices at the LaAlO_{3}/SrTiO_{3} interface (2014)

D. Stornaiuolo, S. Gariglio, A. Fête, M. Gabay, D. Li, D. Massarotti, and J.-M. Triscone

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): D. Stornaiuolo, S. Gariglio, A. Fête, M. Gabay, D. Li, D. Massarotti, and J.-M. Triscone Using field effect devices with side gates, we modulate the 2-dimensional electron gas hosted at the LaAlO 3 /SrTiO 3 interface to study the temperature and doping evolution of the magnetotransport. The analysis of the data reveals different transport regimes depending on the interplay between the diff... [Phys. Rev. B 90, 235426] Published Tue Dec 16, 2014

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Defect-induced negative magnetoresistance and surface state robustness in the topological insulator BiSbTeSe_{2} (2014)

Karan Banerjee, Jaesung Son, Praveen Deorani, Peng Ren, Lan Wang, and Hyunsoo Yang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): Karan Banerjee, Jaesung Son, Praveen Deorani, Peng Ren, Lan Wang, and Hyunsoo Yang Absence of backscattering and occurrence of weak antilocalization are two characteristic features of topological insulators. We find that the introduction of defects results in the appearance of a negative contribution to magnetoresistance (MR) in the topological insulator BiSbTeSe 2 at temperatures ... [Phys. Rev. B 90, 235427] Published Wed Dec 17, 2014

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Hot-electron noise properties of graphene-like systems (2014)

A. Rustagi and C. J. Stanton

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): A. Rustagi and C. J. Stanton We study the hot-electron noise properties of two-dimensional materials with a graphene-like energy dispersion under a strong applied electric field which drives the system far from equilibrium. Calculations are based on a Boltzmann–Green-function method within a two-relaxation-time approximation th... [Phys. Rev. B 90, 245424] Published Wed Dec 17, 2014

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Spin-flip Raman scattering of the resident electron in singly charged (In,Ga)As/GaAs quantum dot ensembles (2014)

J. Debus, V. F. Sapega, D. Dunker, D. R. Yakovlev, D. Reuter, A. D. Wieck, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): J. Debus, V. F. Sapega, D. Dunker, D. R. Yakovlev, D. Reuter, A. D. Wieck, and M. Bayer Highly efficient spin-flip Raman scattering of the resident electron spin is found in singly charged (In,Ga)As/GaAs quantum dots. The applied magnetic field induces a symmetry reduction for the negatively charged exciton, which serves as intermediate scattering state, thus making the spin-flip Raman... [Phys. Rev. B 90, 235404] Published Mon Dec 01, 2014

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Interplay between electronic topology and crystal symmetry: Dislocation-line modes in topological band insulators (2014)

Robert-Jan Slager, Andrej Mesaros, Vladimir Juričić, and Jan Zaanen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): Robert-Jan Slager, Andrej Mesaros, Vladimir Juričić, and Jan Zaanen We elucidate the general rule governing the response of dislocation lines in three-dimensional topological band insulators. According to this K - b - t rule, the lattice topology, represented by dislocation lines oriented in direction t with Burgers vector b , combines with the electronic-band topology, ... [Phys. Rev. B 90, 241403] Published Mon Dec 01, 2014

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High intrinsic mobility and ultrafast carrier dynamics in multilayer metal-dichalcogenide MoS_{2} (2014)

Jared H. Strait, Parinita Nene, and Farhan Rana

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): Jared H. Strait, Parinita Nene, and Farhan Rana The ultimate limitations on carrier mobilities in metal dichalcogenides, and the dynamics associated with carrier relaxation, are unclear. We present measurements of the frequency-dependent conductivity of multilayer dichalcogenide MoS 2 by optical-pump terahertz-probe spectroscopy. We find mobilitie... [Phys. Rev. B 90, 245402] Published Mon Dec 01, 2014

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Stable structure of high In coverage on Si(111)-α-sqrt[3]×sqrt[3]-Au (2014)

Shih-Yu Wu, Chia-Hsiu Hsu, Wang-chi V. Yeh, Hsin Lin, Feng-Chuan Chuang, and Chien-Cheng Kuo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-03

Beschreibung: Author(s): Shih-Yu Wu, Chia-Hsiu Hsu, Wang-chi V. Yeh, Hsin Lin, Feng-Chuan Chuang, and Chien-Cheng Kuo The structure of 0.8 ML In coverage on the Si(111)-√ 3 ×√ 3 -Au surface is investigated by scanning tunneling microscopy/spectroscopy and low energy electron diffraction. By depositing 1.2 ML In at room temperature followed by annealing at 500 ∘ C, the surface reveals the √ 7 ×√ 3 structure with 0.8 ML In c... [Phys. Rev. B 90, 235407] Published Tue Dec 02, 2014

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Dissipative preparation of the exciton and biexciton in self-assembled quantum dots on picosecond time scales (2014)

Per-Lennart Ardelt, Lukas Hanschke, Kevin A. Fischer, Kai Müller, Alexander Kleinkauf, Manuel Koller, Alexander Bechtold, Tobias Simmet, Jakob Wierzbowski, Hubert Riedl, Gerhard Abstreiter, and Jonathan J. Finley

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-03

Beschreibung: Author(s): Per-Lennart Ardelt, Lukas Hanschke, Kevin A. Fischer, Kai Müller, Alexander Kleinkauf, Manuel Koller, Alexander Bechtold, Tobias Simmet, Jakob Wierzbowski, Hubert Riedl, Gerhard Abstreiter, and Jonathan J. Finley Pulsed resonant fluorescence is used to probe ultrafast phonon-assisted exciton and biexciton preparation in individual self-assembled InGaAs quantum dots. By driving the system using large area (≥10π) near resonant optical pulses, we experimentally demonstrate how phonon-mediated dissipation within... [Phys. Rev. B 90, 241404] Published Tue Dec 02, 2014

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From weak to strong coupling of localized surface plasmons to guided modes in a luminescent slab (2014)

S. R. K. Rodriguez, Y. T. Chen, T. P. Steinbusch, M. A. Verschuuren, A. F. Koenderink, and J. Gómez Rivas

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-03

Beschreibung: Author(s): S. R. K. Rodriguez, Y. T. Chen, T. P. Steinbusch, M. A. Verschuuren, A. F. Koenderink, and J. Gómez Rivas We investigate a periodic array of aluminum nanoantennas embedded in a light-emitting slab waveguide. By varying the waveguide thickness, we demonstrate the transition from weak to strong coupling between localized surface plasmons in the nanoantennas and refractive index guided modes in the wavegui... [Phys. Rev. B 90, 235406] Published Tue Dec 02, 2014

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Transport characteristics of a single C_{60}-molecule junction revealed by multiple Andreev reflections (2014)

Ryoichi Hiraoka, Ryuichi Arafune, Noriyuki Tsukahara, Maki Kawai, and Noriaki Takagi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-03

Beschreibung: Author(s): Ryoichi Hiraoka, Ryuichi Arafune, Noriyuki Tsukahara, Maki Kawai, and Noriaki Takagi The I-V characteristics for atomic junction between two superconductors exhibit steps at voltages 2Δ/ n (with n=1, 2, 3, …) associated with multiple Andreev reflections (MAR). These features have been used in the past to determine the fundamental transport characteristics of atomic junctions. In this work, the authors present a development of the MAR technique by utilizing a superconducting Nb STM tip as one of the leads to study the transport properties of C 60 fullerene molecule. By analyzing the tunneling spectra and high-resolution molecular imaging, they were able to determine the number of conduction channels for C 6 0 as well as the origin and the dependence of the transmission coefficients on the contact geometry. [Phys. Rev. B 90, 241405] Published Tue Dec 02, 2014

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Electron dynamics in unoccupied states of spatially aligned 7-a graphene nanoribbons on Au(788) (2014)

N. F. Kleimeier, A. Timmer, L. Bignardi, H. Mönig, X. L. Feng, K. Müllen, L. F. Chi, H. Fuchs, and H. Zacharias

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): N. F. Kleimeier, A. Timmer, L. Bignardi, H. Mönig, X. L. Feng, K. Müllen, L. F. Chi, H. Fuchs, and H. Zacharias Bottom-up synthesized armchair graphene nanoribbons with a width of seven C = C bonds (7-aGNRs) have gained widespread interest due to their large band gap of about 2.8 eV and their atomically precise edge structures. Here, we report on the lifetime of excited states of spatially aligned 7-aGNRs gro... [Phys. Rev. B 90, 245408] Published Wed Dec 03, 2014

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Rashba splitting of graphene-covered Au(111) revealed by quasiparticle interference mapping (2014)

Philipp Leicht, Julia Tesch, Samuel Bouvron, Felix Blumenschein, Philipp Erler, Luca Gragnaniello, and Mikhail Fonin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): Philipp Leicht, Julia Tesch, Samuel Bouvron, Felix Blumenschein, Philipp Erler, Luca Gragnaniello, and Mikhail Fonin We report on low-temperature scanning tunneling spectroscopy measurements on epitaxial graphene flakes on Au(111). We show that using quasiparticle interference (QPI) mapping, we can discriminate between the electronic systems of graphene and Au(111). Beyond the scattering vectors, which can be ascr... [Phys. Rev. B 90, 241406] Published Wed Dec 03, 2014

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Anomalous electrical conduction in a monatomic Pb layer on Ge(111) (2014)

Shinichiro Hatta, Takashi Noma, Hiroshi Okuyama, and Tetsuya Aruga

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): Shinichiro Hatta, Takashi Noma, Hiroshi Okuyama, and Tetsuya Aruga We studied electrical transport through a Pb monolayer on Ge(111), which has a metallic surface state with a large Rashba spin splitting. The Pb monolayer was found to be metallic down to 9 K. The macroscopic sheet conductivity was 10.2±1.0mS/□ at 9 K, which is much higher than those of other metall... [Phys. Rev. B 90, 245407] Published Wed Dec 03, 2014

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Local electrical tuning of the nonlocal signals in a Cooper pair splitter (2014)

G. Fülöp, S. d'Hollosy, A. Baumgartner, P. Makk, V. A. Guzenko, M. H. Madsen, J. Nygård, C. Schönenberger, and S. Csonka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): G. Fülöp, S. d'Hollosy, A. Baumgartner, P. Makk, V. A. Guzenko, M. H. Madsen, J. Nygård, C. Schönenberger, and S. Csonka A Cooper pair splitter consists of a central superconducting contact, S, from which electrons are injected into two parallel, spatially separated quantum dots (QDs). This geometry as well as electron interactions can lead to correlated electrical currents due to the spatial separation of spin-single... [Phys. Rev. B 90, 235412] Published Thu Dec 04, 2014

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Optically induced Aharonov-Bohm effect in mesoscopic rings (2014)

H. Sigurdsson, O. V. Kibis, and I. A. Shelykh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): H. Sigurdsson, O. V. Kibis, and I. A. Shelykh We show theoretically that strong electron coupling to circularly polarized photons in non-singly-connected nanostructures results in the appearance of an artificial gauge field that changes the electron phase. The effect arises from the breaking of time-reversal symmetry and is analogous to the wel... [Phys. Rev. B 90, 235413] Published Thu Dec 04, 2014

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Spin-resolved optical conductivity of two-dimensional group-VIB transition-metal dichalcogenides (2014)

Marco Gibertini, Francesco M. D. Pellegrino, Nicola Marzari, and Marco Polini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): Marco Gibertini, Francesco M. D. Pellegrino, Nicola Marzari, and Marco Polini We present an ab initio study of the spin-resolved optical conductivity of two-dimensional (2D) group-VIB transition-metal dichalcogenides (TMDs). We carry out fully relativistic density-functional-theory calculations combined with maximally localized Wannier functions to obtain band manifolds at ex... [Phys. Rev. B 90, 245411] Published Thu Dec 04, 2014

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Boron aggregation in the ground states of boron-carbon fullerenes (2014)

Stephan Mohr, Pascal Pochet, Maximilian Amsler, Bastian Schaefer, Ali Sadeghi, Luigi Genovese, and Stefan Goedecker

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Stephan Mohr, Pascal Pochet, Maximilian Amsler, Bastian Schaefer, Ali Sadeghi, Luigi Genovese, and Stefan Goedecker We present unexpected structural motifs for boron-carbon nanocages of the stoichiometries B12C48 and B12C50, based on first-principles calculations. These configurations are distinct from those proposed so far because the boron atoms are not isolated and distributed over the entire surface of the ca... [Phys. Rev. B 89, 041404] Published Fri Jan 10, 2014

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Tunnel junction of helical edge states: Determining and controlling spin-preserving and spin-flipping processes through transconductance (2014)

Pietro Sternativo and Fabrizio Dolcini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): Pietro Sternativo and Fabrizio Dolcini When a constriction is realized in a 2D quantum spin Hall system, electron tunneling between helical edge states occurs via two types of channels allowed by time-reversal symmetry, namely spin-preserving (p) and spin-flipping (f) tunneling processes. Determining and controlling the effects of these ... [Phys. Rev. B 89, 035415] Published Tue Jan 14, 2014

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Spectroscopy of a topological phase (2014)

Michael Kamfor, Sébastien Dusuel, Julien Vidal, and Kai Phillip Schmidt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): Michael Kamfor, Sébastien Dusuel, Julien Vidal, and Kai Phillip Schmidt Dynamical correlation functions of the toric code in a uniform magnetic field are studied inside the topological phase, in the small-field limit. Such an experimentally measurable quantity displays rich field-dependent features that can be understood via the interplay of the kinetics and the interac... [Phys. Rev. B 89, 045411] Published Tue Jan 14, 2014

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Excitonic recombinations in h-BN: From bulk to exfoliated layers (2014)

A. Pierret, J. Loayza, B. Berini, A. Betz, B. Plaçais, F. Ducastelle, J. Barjon, and A. Loiseau

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): A. Pierret, J. Loayza, B. Berini, A. Betz, B. Plaçais, F. Ducastelle, J. Barjon, and A. Loiseau Hexagonal boron nitride (h-BN) and graphite are structurally similar but with very different properties. Their combination in graphene-based devices is now of intense research focus, and it becomes particularly important to evaluate the role played by crystalline defects on their properties. In this... [Phys. Rev. B 89, 035414] Published Tue Jan 14, 2014

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Titration of submonolayer Au growth on Si(111) (2014)

J. Kautz, M. W. Copel, M. S. Gordon, R. M. Tromp, and S. J. van der Molen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): J. Kautz, M. W. Copel, M. S. Gordon, R. M. Tromp, and S. J. van der Molen We study and analyze the growth of submonolayers of Au on Si(111) by a complementary set of surface techniques. Specifically, we focus on the 5×2 and the α3×3 structures. We determine the gold coverage of these structures as a function of temperature by means of low energy electron diffraction (LEED... [Phys. Rev. B 89, 035416] Published Tue Jan 14, 2014

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Absence of hyperfine effects in 13C-graphene spin-valve devices (2014)

M. Wojtaszek, I. J. Vera-Marun, E. Whiteway, M. Hilke, and B. J. van Wees

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): M. Wojtaszek, I. J. Vera-Marun, E. Whiteway, M. Hilke, and B. J. van Wees The carbon isotope 13C, in contrast to 12C, possesses a nuclear magnetic moment and can induce electron spin dephasing in graphene. This effect is usually neglected due to the low abundance of 13C in natural carbon allotropes (∼1%). Chemical vapor deposition (CVD) allows for artificial synthesis of ... [Phys. Rev. B 89, 035417] Published Tue Jan 14, 2014

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

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Nonequilibrium distribution functions for quantum transport: Universality and approximation for the steady state regime (2014)

H. Ness

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): H. Ness We derive a general expression for the electron nonequilibrium (NE) distribution function in the context of steady state quantum transport through a two-terminal nanodevice with interactions. The central idea for the use of NE distributions for open quantum systems is that both the NE and many-body ... [Phys. Rev. B 89, 045409] Published Mon Jan 13, 2014

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Electron-photon scattering mediated by localized plasmons: A quantitative analysis by eigen-response theory (2014)

Kin Hung Fung, Anil Kumar, and Nicholas X. Fang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Kin Hung Fung, Anil Kumar, and Nicholas X. Fang We show that the scattering interaction between a high energy electron and a photon can be strongly enhanced by different types of localized plasmons in a nontrivial way. The scattering interaction is predicted by an eigen-response theory, numerically verified by finite-difference-time-domain simula... [Phys. Rev. B 89, 045408] Published Mon Jan 13, 2014

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Andreev reflection in monolayer MoS2 (2014)

Leyla Majidi, Habib Rostami, and Reza Asgari

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Leyla Majidi, Habib Rostami, and Reza Asgari Andreev reflection in a monolayer molybdenum disulfide superconducting-normal (S/N) hybrid junction is investigated. We find, by using a modified Dirac Hamiltonian and the scattering formalism, that the perfect Andreev reflection happens at normal incidence with p-doped S and N regions. The probabil... [Phys. Rev. B 89, 045413] Published Wed Jan 15, 2014

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Charge mobility and current-induced spin polarization in nonlinear surface transport of a topological insulator with hexagonal warping (2014)

C. M. Wang and X. L. Lei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): C. M. Wang and X. L. Lei The nonlinear charge mobility and current-induced spin polarization in the nonlinear surface transport of a topological insulator with a hexagonal deforming band are investigated in the presence of a strong dc electric field by means of a balance-equation approach for a single energy band. The nonli... [Phys. Rev. B 89, 045415] Published Fri Jan 17, 2014

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Nonlocal spectroscopy of Andreev bound states (2014)

J. Schindele, A. Baumgartner, R. Maurand, M. Weiss, and C. Schönenberger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): J. Schindele, A. Baumgartner, R. Maurand, M. Weiss, and C. Schönenberger We experimentally investigate Andreev bound states (ABSs) in a carbon nanotube quantum dot (QD) connected to a superconducting Nb lead (S). A weakly coupled normal metal contact acts as a tunnel probe that measures the energy dispersion of the ABSs. Moreover, we study the response of the ABS to nonl... [Phys. Rev. B 89, 045422] Published Wed Jan 22, 2014

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Tunable polarization in a beam splitter based on two-dimensional topological insulators (2014)

D. G. Rothe and E. M. Hankiewicz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): D. G. Rothe and E. M. Hankiewicz The typical bulk model describing 2D topological insulators (TI) consists of two types of spin-orbit terms, the so-called Dirac term, which induces out-of-plane spin polarization, and the Rashba term, which induces in-plane spin polarization. We show that for some parameters of the Fermi energy, the... [Phys. Rev. B 89, 035418] Published Tue Jan 14, 2014

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Transport across two interacting quantum dots: Bulk Kondo, Kondo box, and molecular regimes (2014)

L. C. Ribeiro, I. J. Hamad, G. Chiappe, and E. V. Anda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): L. C. Ribeiro, I. J. Hamad, G. Chiappe, and E. V. Anda We analyze the transport properties of a double quantum dot device with both dots coupled to perfect conducting leads and to a finite chain of N noninteracting sites connecting both of them. The interdot chain strongly influences the transport across the system and the local density of states of the... [Phys. Rev. B 89, 045412] Published Tue Jan 14, 2014

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Microwave-induced zero-resistance states and second-harmonic generation in an ultraclean two-dimensional electron gas (2014)

S. A. Mikhailov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): S. A. Mikhailov The microwave-induced resistance oscillations and “zero-resistance” states were discovered in ultraclean two-dimensional electron systems in 2001–2003 and have attracted great interest from researchers. A comprehensive theory of these phenomena was developed in 2011: It was shown that all experiment... [Phys. Rev. B 89, 045410] Published Tue Jan 14, 2014

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Possibility for exciton Bose-Einstein condensation in carbon nanotubes (2014)

I. V. Bondarev and A. V. Meliksetyan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): I. V. Bondarev and A. V. Meliksetyan We demonstrate a possibility for exciton Bose-Einstein condensation in individual small-diameter (∼1--2 nm) semiconducting carbon nanotubes. The effect occurs under the exciton-interband-plasmon coupling controlled by an external electrostatic field applied perpendicular to the nanotube axis. It req... [Phys. Rev. B 89, 045414] Published Fri Jan 17, 2014

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Self-quenching of nuclear spin dynamics in the central spin problem (2014)

Arne Brataas and Emmanuel I. Rashba

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Arne Brataas and Emmanuel I. Rashba We consider, in the framework of the central spin s=1/2 model, driven dynamics of two electrons in a double quantum dot subject to hyperfine interaction with nuclear spins and spin-orbit coupling. The nuclear subsystem dynamically evolves in response to Landau-Zener singlet-triplet transitions of th... [Phys. Rev. B 89, 035423] Published Tue Jan 21, 2014

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Kondo effect of a cobalt adatom on a zigzag graphene nanoribbon (2014)

Damian Krychowski, Jakub Kaczkowski, and Stanislaw Lipinski

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Damian Krychowski, Jakub Kaczkowski, and Stanislaw Lipinski Based on ab initio calculations we discuss the Kondo effect due to a Co adatom on a graphene zigzag nanoribbon. A Co atom located at a hollow site behaves as a spin S=1/2 impurity with dxz and dyz orbitals contributing to the magnetic moment. Dynamical correlations are analyzed with the use of compl... [Phys. Rev. B 89, 035424] Published Tue Jan 21, 2014

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Optical properties of Bernal-stacked bilayer graphene: A theoretical study (2014)

Faris Kadi and Ermin Malic

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Faris Kadi and Ermin Malic We present a microscopic study of optical properties of Bernal-stacked bilayer graphene. Our focus lies on the absorption spectrum explicitly including the impact of fully momentum-dependent optical and Coulomb matrix elements. Our approach is based on the density matrix formalism combined with tigh... [Phys. Rev. B 89, 045419] Published Tue Jan 21, 2014

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Feshbach-type resonances for two-particle scattering in graphene (2014)

C. Gaul, F. Domínguez-Adame, F. Sols, and I. Zapata

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): C. Gaul, F. Domínguez-Adame, F. Sols, and I. Zapata Two-particle scattering in graphene is a multichannel problem, where the energies of the identical or opposite-helicity channels lie in disjoint energy segments. Due to the absence of Galilean invariance, these segments depend on the total momentum Q. The dispersion relations for the two opposite-he... [Phys. Rev. B 89, 045420] Published Tue Jan 21, 2014

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Charge carrier relaxation processes in TbAs nanoinclusions in GaAs measured by optical-pump THz-probe transient absorption spectroscopy (2014)

Laura R. Vanderhoef, Abul K. Azad, Cory C. Bomberger, Dibakar Roy Chowdhury, D. Bruce Chase, Antoinette J. Taylor, Joshua M. O. Zide, and Matthew F. Doty

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Laura R. Vanderhoef, Abul K. Azad, Cory C. Bomberger, Dibakar Roy Chowdhury, D. Bruce Chase, Antoinette J. Taylor, Joshua M. O. Zide, and Matthew F. Doty Rare-earth materials epitaxially codeposited with III-V semiconductors form small, spherical rare-earth-monopnictide nanoparticles embedded within the III-V host. The small size of these particles (approximately 1.5 nm diameter) suggests that interesting electronic properties might emerge as a resul... [Phys. Rev. B 89, 045418] Published Tue Jan 21, 2014

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Comparison of van der Waals corrected and sparse-matter density functionals for the metal-free phthalocyanine/gold interface (2014)

Johann Lüder, Biplab Sanyal, Olle Eriksson, Carla Puglia, and Barbara Brena

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Johann Lüder, Biplab Sanyal, Olle Eriksson, Carla Puglia, and Barbara Brena In this paper, we report a systematic study on the effect of different van der Waals dispersion correction methods in conjunction with Density Functional Theory on the adsorption characteristics of a monolayer of metal-free phthalocyanine on Au(111). The chosen dispersion corrections were DFT-D2, th... [Phys. Rev. B 89, 045416] Published Tue Jan 21, 2014

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Pseudodiffusive conductance, quantum-limited shot noise, and Landau-level hierarchy in a biased graphene bilayer (2014)

Grzegorz Rut and Adam Rycerz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Grzegorz Rut and Adam Rycerz We discuss, by means of mode-matching analysis for the Dirac equation, how splittings of the Landau-level (LL) degeneracies associated with spin, valley, and layer degrees of freedom affect the ballistic conductance of graphene bilayer. The results show that for wide samples (W≫L) the Landauer-Bütti... [Phys. Rev. B 89, 045421] Published Wed Jan 22, 2014

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Formation mechanism of bound states in graphene point contacts (2014)

Hai-Yao Deng, Katsunori Wakabayashi, and Chi-Hang Lam

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Hai-Yao Deng, Katsunori Wakabayashi, and Chi-Hang Lam Electronic localization in narrow graphene constrictions is theoretically studied, and it is found that long-lived (∼1 ns) quasibound states (QBSs) can exist in a class of ultrashort graphene quantum point contacts (QPCs). These QBSs are shown to originate from the dispersionless edge states that ar... [Phys. Rev. B 89, 045423] Published Wed Jan 22, 2014

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Substitutional doping of graphene: The role of carbon divacancies (2014)

L. Tsetseris, B. Wang, and S. T. Pantelides

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): L. Tsetseris, B. Wang, and S. T. Pantelides The most common approach to dope an electronic material is to substitute a constituent atom with a suitable impurity. Here we show with first-principles calculations that this is not the best recipe for doping graphene with Al, P, Ga, or As impurities. Instead, substitution of two C atoms by one of ... [Phys. Rev. B 89, 035411] Published Fri Jan 10, 2014

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Inelastic current noise in nanoscale systems: Scattering theory analysis (2014)

Sejoong Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Sejoong Kim We present a scattering theory description for the inelastic current noise in the presence of electron-vibration interactions. In this description, we specify elastic and inelastic scattering contributions to the shot noise by examining charge transfers between scattering states and energy exchange ... [Phys. Rev. B 89, 035413] Published Mon Jan 13, 2014

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Transverse-electric surface plasmon for graphene in the Dirac equation model (2014)

M. Bordag and I. G. Pirozhenko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): M. Bordag and I. G. Pirozhenko We consider single-layer plane graphene with electronic excitations described by the Dirac equation. Using a known representation of the polarization tensor in terms of the spinor loop, we show the existence of surface modes, i.e., undamped in time excitations of the electromagnetic field, propagati... [Phys. Rev. B 89, 035421] Published Thu Jan 16, 2014

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Charge transport and interdot coupling tuned by the tunnel barrier length in assemblies of nanoparticles surrounded by organic ligands (2014)

J. Dugay, R. P. Tan, M. Ibrahim, C. Garcia, J. Carrey, L.-M. Lacroix, P.-F. Fazzini, G. Viau, and M. Respaud

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): J. Dugay, R. P. Tan, M. Ibrahim, C. Garcia, J. Carrey, L.-M. Lacroix, P.-F. Fazzini, G. Viau, and M. Respaud Low-temperature electrical measurements were performed on arrays of metallic nanoparticles coated by alkylamines. The length of the alkyl molecules was varied (18, 12, and four carbons), while the size of the metallic nanoparticles was fixed at 10.3 nm. This allowed us to investigate the effect of ... [Phys. Rev. B 89, 041406] Published Thu Jan 23, 2014

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Bound state energy of a Coulomb impurity in gapped bilayer graphene (2014)

Brian Skinner, B. I. Shklovskii, and M. B. Voloshin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): Brian Skinner, B. I. Shklovskii, and M. B. Voloshin Application of a perpendicular electric field induces a band gap in bilayer graphene, and it also creates a “Mexican hat” structure in the dispersion relation. This structure has unusual implications for the hydrogen-like bound state of an electron to a Coulomb impurity. We calculate the ground stat... [Phys. Rev. B 89, 041405] Published Thu Jan 23, 2014

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Theory of action spectroscopy for single-molecule reactions induced by vibrational excitations with STM (2014)

T. Frederiksen, M. Paulsson, and H. Ueba

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): T. Frederiksen, M. Paulsson, and H. Ueba A theory of action spectroscopy, i.e., a reaction rate or yield as a function of bias voltage, is presented for single-molecule reactions induced by the inelastic tunneling current with a scanning tunneling microscope. A formula for the reaction yield is derived using the adsorbate resonance model, ... [Phys. Rev. B 89, 035427] Published Thu Jan 23, 2014

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From spin-polarized interfaces to giant magnetoresistance in organic spin valves (2014)

Deniz Çakır, Diana M. Otálvaro, and Geert Brocks

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Deniz Çakır, Diana M. Otálvaro, and Geert Brocks We calculate the spin-polarized electronic transport through a molecular bilayer spin valve from first principles, and establish the link between the magnetoresistance and the spin-dependent interactions at the metal-molecule interfaces. The magnetoresistance of a Fe|bilayer-C70|Fe spin valve attain... [Phys. Rev. B 89, 115407] Published Mon Mar 10, 2014

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Origin and impact of sublattice symmetry breaking in nitrogen-doped graphene (2014)

I. Deretzis and A. La Magna

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): I. Deretzis and A. La Magna We use the density functional theory to demonstrate that the chemical reactivity of nitrogen atoms with a propagating zigzag edge during the nucleation of graphene grains can give rise to persistent sublattice symmetry breaking phenomena. Their effect on the electronic structure of a formed two-dime... [Phys. Rev. B 89, 115408] Published Mon Mar 10, 2014

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Temperature- and density-dependent transport regimes in a h-BN/bilayer graphene/h-BN heterostructure (2014)

C. Cobaleda, S. Pezzini, E. Diez, and V. Bellani

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): C. Cobaleda, S. Pezzini, E. Diez, and V. Bellani We report on multiterminal electrical transport measurements performed on a bilayer graphene sheet enclosed by two hexagonal boron nitride flakes. We characterize the temperature dependence of electrical resistivity from 300 mK to 50 K, varying the carrier densities with a back gate. The resistivity... [Phys. Rev. B 89, 121404] Published Mon Mar 10, 2014

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Negative quantum capacitance in graphene nanoribbons with lateral gates (2014)

R. Reiter, U. Derra, S. Birner, B. Terrés, F. Libisch, J. Burgdörfer, and C. Stampfer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): R. Reiter, U. Derra, S. Birner, B. Terrés, F. Libisch, J. Burgdörfer, and C. Stampfer We present numerical simulations of the capacitive coupling between graphene nanoribbons of various widths and gate electrodes in different configurations. We compare the influence of lateral metallic or graphene side gate structures on the overall back gate capacitive coupling. Most interestingly, ... [Phys. Rev. B 89, 115406] Published Mon Mar 10, 2014

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Spectral evolution of the SU(4) Kondo effect from the single impurity to the two-dimensional limit (2014)

Alejandro M. Lobos, Marcelo Romero, and Armando A. Aligia

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Alejandro M. Lobos, Marcelo Romero, and Armando A. Aligia We describe the evolution of the SU(4) Kondo effect as the number of magnetic centers increases from one impurity to the two-dimensional (2D) lattice. We derive a Hubbard-Anderson model which describes a 2D array of atoms or molecules with twofold orbital degeneracy, acting as magnetic impurities an... [Phys. Rev. B 89, 121406] Published Mon Mar 10, 2014

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Ultra-high precision determination of site energy differences using a Bayesian method (2014)

B. A. J. Lechner, P. R. Kole, H. Hedgeland, A. P. Jardine, W. Allison, B. J. Hinch, and J. Ellis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): B. A. J. Lechner, P. R. Kole, H. Hedgeland, A. P. Jardine, W. Allison, B. J. Hinch, and J. Ellis Accurate experimental data of adsorbate potential energy landscapes are crucial as benchmarks for the evaluation of first-principles calculations. Here, we present a Bayesian method, analyzing the difference in forward and backward hopping rate in helium spin-echo measurements, that allows us to det... [Phys. Rev. B 89, 121405] Published Mon Mar 10, 2014

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Exotic fractional topological states in a two-dimensional organometallic material (2014)

Wei Li, Zheng Liu, Yong-Shi Wu, and Yan Chen

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Wei Li, Zheng Liu, Yong-Shi Wu, and Yan Chen Fractional Chern insulators (FCIs), having properties similar to those of the fractional quantum Hall effect, have been established numerically in various toy models. To fully explore their fundamental physics and to develop practical applications, material realization is indispensable. Here we theo... [Phys. Rev. B 89, 125411] Published Mon Mar 10, 2014

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Quantum well states with nonvanishing parallel momentum in Cu/Co/Cu(100) (2014)

P. Kloth, M. Wenderoth, P. Willke, H. Prüser, and R. G. Ulbrich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): P. Kloth, M. Wenderoth, P. Willke, H. Prüser, and R. G. Ulbrich Using low-temperature scanning tunneling spectroscopy we study quantum well states in the topmost copper layer of a Cu/Co/Cu(100) system above the Fermi energy. The emergence and the energetic positions of QWSs within this layer crucially depend on the interface quality tailored by the sample prepar... [Phys. Rev. B 89, 125412] Published Mon Mar 10, 2014

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Persistent charge and spin currents in the long-wavelength regime for graphene rings (2014)

N. Bolívar, E. Medina, and B. Berche

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): N. Bolívar, E. Medina, and B. Berche We address the problem of persistent charge and spin currents on a Corbino disk built from a graphene sheet. We consistently derive the Hamiltonian including kinetic, intrinsic (ISO), and Rashba spin-orbit interactions in cylindrical coordinates. The Hamiltonian is carefully considered to reflect he... [Phys. Rev. B 89, 125413] Published Mon Mar 10, 2014

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Density functional theory based calculations of the transfer integral in a redox-active single-molecule junction (2014)

Georg Kastlunger and Robert Stadler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Georg Kastlunger and Robert Stadler There are various quantum chemical approaches for an ab initio description of transfer integrals within the framework of Marcus theory in the context of electron transfer reactions. In our paper, we aim to calculate transfer integrals in redox-active single molecule junctions, where we focus on the ... [Phys. Rev. B 89, 115412] Published Wed Mar 12, 2014

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Intrinsic optical conductivity of modified Dirac fermion systems (2014)

Habib Rostami and Reza Asgari

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Habib Rostami and Reza Asgari We analytically calculate the intrinsic longitudinal and transverse optical conductivities of electronic systems which govern by a modified Dirac fermion model Hamiltonian for materials beyond graphene such as monolayer MoS2 and ultrathin film of the topological insulator. We analyze the effect of a... [Phys. Rev. B 89, 115413] Published Wed Mar 12, 2014

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Electronic and spin structure of the topological insulator Bi2Te2.4Se0.6 (2014)

A. M. Shikin, I. I. Klimovskikh, S. V. Eremeev, A. A. Rybkina, M. V. Rusinova, A. G. Rybkin, E. V. Zhizhin, J. Sánchez-Barriga, A. Varykhalov, I. P. Rusinov, E. V. Chulkov, K. A. Kokh, V. A. Golyashov, V. Kamyshlov, and O. E. Tereshchenko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): A. M. Shikin, I. I. Klimovskikh, S. V. Eremeev, A. A. Rybkina, M. V. Rusinova, A. G. Rybkin, E. V. Zhizhin, J. Sánchez-Barriga, A. Varykhalov, I. P. Rusinov, E. V. Chulkov, K. A. Kokh, V. A. Golyashov, V. Kamyshlov, and O. E. Tereshchenko High-resolution spin- and angle-resolved photoemission spectroscopy measurements were performed on the three-dimensional topological insulator Bi2Te2.4Se0.6, which is characterized by enhanced thermoelectric properties. The Fermi level position is found to be located in the bulk energy gap independe... [Phys. Rev. B 89, 125416] Published Wed Mar 12, 2014

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Anisotropic electronic conduction in metal nanofilms grown on a one-dimensional surface superstructure (2014)

Naoka Nagamura, Rei Hobara, Tomoya Uetake, Toru Hirahara, Manami Ogawa, Taichi Okuda, Ke He, P. Moras, P. M. Sheverdyaeva, C. Carbone, Katsuyoshi Kobayashi, Iwao Matsuda, and Shuji Hasegawa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Naoka Nagamura, Rei Hobara, Tomoya Uetake, Toru Hirahara, Manami Ogawa, Taichi Okuda, Ke He, P. Moras, P. M. Sheverdyaeva, C. Carbone, Katsuyoshi Kobayashi, Iwao Matsuda, and Shuji Hasegawa We performed in situ conductivity measurements by multiple microscopic probes of Ag nanofilms grown on a periodic array of indium atomic wires on Si(111). Within the investigated thickness range the transport properties differ markedly from the bulk case. The ratio between the in-plane conductivity ... [Phys. Rev. B 89, 125415] Published Wed Mar 12, 2014

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Tunneling between a topological superconductor and a Luttinger liquid (2014)

Yu-Wen Lee and Yu-Li Lee

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-14

Beschreibung: Author(s): Yu-Wen Lee and Yu-Li Lee We study the quantum point contact between the topological superconductor and the helical Luttinger liquid. The effects of the electron-electron interactions in the helical Luttinger liquid on the low-energy physics of this system are analyzed by the renormalization group. Among the various coupling... [Phys. Rev. B 89, 125417] Published Thu Mar 13, 2014

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Scanning-gate-induced effects in nonlinear transport through nanostructures (2014)

Cosimo Gorini, Dietmar Weinmann, and Rodolfo A. Jalabert

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-14

Beschreibung: Author(s): Cosimo Gorini, Dietmar Weinmann, and Rodolfo A. Jalabert We investigate the effect of a scanning gate tip on the nonlinear quantum transport properties of nanostructures. Generally, we predict that the symmetry of the current-voltage characteristic in reflection-symmetric samples is broken by a tip-induced rectifying conductance correction. Moreover, in t... [Phys. Rev. B 89, 115414] Published Thu Mar 13, 2014

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Interaction of static charges in graphene within Monte Carlo simulation (2014)

V. V. Braguta, S. N. Valgushev, A. A. Nikolaev, M. I. Polikarpov, and M. V. Ulybyshev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): V. V. Braguta, S. N. Valgushev, A. A. Nikolaev, M. I. Polikarpov, and M. V. Ulybyshev The study of the interaction potential between static charges within Monte Carlo simulation of graphene is carried out. The numerical simulations are performed in the effective lattice field theory with noncompact (3+1)-dimensional Abelian lattice gauge fields and (2+1)-dimensional staggered lattice... [Phys. Rev. B 89, 195401] Published Fri May 02, 2014

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Quantum spin Hall effect on germanene nanorod embedded in completely hydrogenated germanene (2014)

L. Seixas, J. E. Padilha, and A. Fazzio

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): L. Seixas, J. E. Padilha, and A. Fazzio We show that germanene nanoroads embedded in completely hydrogenated germanene (germanane) exhibits a quantum spin Hall effect (QSHE). These nanoroads can be obtained experimentally by local hydrogen dissociation from germanane. Using first-principle calculations we predict that germanene nanoroads ... [Phys. Rev. B 89, 195403] Published Mon May 05, 2014

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Influence of Coulomb interaction on the anisotropic Dirac cone in graphene (2014)

Jing-Rong Wang and Guo-Zhu Liu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Jing-Rong Wang and Guo-Zhu Liu Anisotropic Dirac cones can appear in a number of correlated electron systems, such as cuprate superconductors and deformed graphene. We study the influence of long-range Coulomb interaction on the physical properties of an anisotropic graphene by using the renormalization group method and 1/N expan... [Phys. Rev. B 89, 195404] Published Mon May 05, 2014

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Experimental investigation of the vibrational density of states and electronic excitations in metallic nanocrystals (2014)

M. Bayle, P. Benzo, N. Combe, C. Gatel, C. Bonafos, G. Benassayag, and R. Carles

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): M. Bayle, P. Benzo, N. Combe, C. Gatel, C. Bonafos, G. Benassayag, and R. Carles An investigation of the vibrational density of states (VDOS) in silver nanocrystals is performed using Raman scattering. A specific sample architecture, setup configuration, and original elaboration process are used in order to take simultaneously advantage of spectrally and spatially localized surf... [Phys. Rev. B 89, 195402] Published Mon May 05, 2014

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Gapless MoS2 allotrope possessing both massless Dirac and heavy fermions (2014)

Weifeng Li, Meng Guo, Gang Zhang, and Yong-Wei Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Weifeng Li, Meng Guo, Gang Zhang, and Yong-Wei Zhang MoS2, a member of transition metal dichalcogenides (TMDs), has recently emerged as an interesting two-dimensional material due to its unique mechanical, thermal, electronic and optical properties. Unlike graphene which possesses massless Dirac fermions with ultrahigh electron mobility, monolayer MoS... [Phys. Rev. B 89, 205402] Published Mon May 05, 2014

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Nonmonotonic spin relaxation and decoherence in graphene quantum dots with spin-orbit interactions (2014)

Marco O. Hachiya, Guido Burkard, and J. Carlos Egues

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Marco O. Hachiya, Guido Burkard, and J. Carlos Egues We investigate the spin relaxation and decoherence in a single-electron graphene quantum dot with Rashba and intrinsic spin-orbit interactions. We derive an effective spin-phonon Hamiltonian via the Schrieffer-Wolff transformation in order to calculate the spin relaxation time T1 and decoherence tim... [Phys. Rev. B 89, 115427] Published Wed Mar 19, 2014

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Universal ac conduction in large area atomic layers of CVD-grown MoS2 (2014)

S. Ghosh, S. Najmaei, S. Kar, R. Vajtai, J. Lou, N. R. Pradhan, L. Balicas, P. M. Ajayan, and S. Talapatra

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): S. Ghosh, S. Najmaei, S. Kar, R. Vajtai, J. Lou, N. R. Pradhan, L. Balicas, P. M. Ajayan, and S. Talapatra Here, we report on the ac conductivity [σ′(ω);10mHz〈ω〈0.1MHz] measurements performed on atomically thin, two-dimensional layers of MoS2 grown by chemical vapor deposition (CVD). σ′(ω) is observed to display a “universal” power law, i.e., σ′(ω)∼ωs measured within a broad range of temperatures, ... [Phys. Rev. B 89, 125422] Published Wed Mar 19, 2014

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Low dimensionality of the surface conductivity of diamond (2014)

Moritz V. Hauf, Patrick Simon, Max Seifert, Alexander W. Holleitner, Martin Stutzmann, and Jose A. Garrido

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Moritz V. Hauf, Patrick Simon, Max Seifert, Alexander W. Holleitner, Martin Stutzmann, and Jose A. Garrido Undoped diamond, a remarkable bulk electrical insulator, exhibits a high surface conductivity in air when the surface is hydrogen terminated. Although theoretical models have claimed that a two-dimensional hole gas is established as a result of surface energy-band bending, no definitive experimental... [Phys. Rev. B 89, 115426] Published Wed Mar 19, 2014

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Two-dimensional square ternary Cu2MX4 (M = Mo, W; X = S, Se) monolayers and nanoribbons predicted from density functional theory (2014)

Li-Yong Gan and Udo Schwingenschlögl

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Li-Yong Gan and Udo Schwingenschlögl Two-dimensional (2D) materials often adopt a hexagonal lattice. We report on a class of 2D materials, Cu2MX4 (M = Mo, W; X = S, Se), that has a square lattice. Up to three monolayers, the systems are kinetically stable. All of them are semiconductors with band gaps from 2.03 to 2.48 eV. Specifically... [Phys. Rev. B 89, 125423] Published Wed Mar 19, 2014

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Quantifying and controlling the magnetic dipole contribution to 1.5−μm light emission in erbium-doped yttrium oxide (2014)

Dongfang Li, Mingming Jiang, Sébastien Cueff, Christopher M. Dodson, Sinan Karaveli, and Rashid Zia

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-30

Beschreibung: Author(s): Dongfang Li, Mingming Jiang, Sébastien Cueff, Christopher M. Dodson, Sinan Karaveli, and Rashid Zia We experimentally quantify the contribution of magnetic dipole (MD) transitions to the near-infrared light emission from trivalent erbium-doped yttrium oxide (Er3+:Y2O3). Using energy-momentum spectroscopy, we demonstrate that the 4I13/2→4I15/2 emission near 1.5 μm originates from nearly equal contr... [Phys. Rev. B 89, 161409] Published Tue Apr 29, 2014

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

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Formation and stability of point defects in monolayer rhenium disulfide (2014)

S. Horzum, D. Çakır, J. Suh, S. Tongay, Y.-S. Huang, C.-H. Ho, J. Wu, H. Sahin, and F. M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): S. Horzum, D. Çakır, J. Suh, S. Tongay, Y.-S. Huang, C.-H. Ho, J. Wu, H. Sahin, and F. M. Peeters Recently, rhenium disulfide (ReS2) monolayers were experimentally extracted by conventional mechanical exfoliation technique from as-grown ReS2 crystals. Unlike the well-known members of transition metal dichalcogenides (TMDs), ReS2 crystallizes in a stable distorted-1T structure and lacks an indire... [Phys. Rev. B 89, 155433] Published Mon Apr 28, 2014

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

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Dynamical localization in a chain of hard core bosons under periodic driving (2014)

Tanay Nag, Sthitadhi Roy, Amit Dutta, and Diptiman Sen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): Tanay Nag, Sthitadhi Roy, Amit Dutta, and Diptiman Sen We study the dynamics of a one-dimensional lattice model of hard core bosons which is initially in a superfluid phase with a current being induced by applying a twist at the boundary. Subsequently, the twist is removed, and the system is subjected to periodic δ-function kicks in the staggered on-sit... [Phys. Rev. B 89, 165425] Published Mon Apr 28, 2014

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

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Surface diffusion of Pb atoms on the Si(553)-Au surface in narrow quasi-one-dimensional channels (2014)

P. Nita, K. Palotás, M. Jałochowski, and M. Krawiec

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): P. Nita, K. Palotás, M. Jałochowski, and M. Krawiec The one-dimensional diffusion of individual Pb atoms on the Si(553)-Au surface has been investigated by a combination of scanning tunneling microscopy (STM), spectroscopy (STS), and first-principles density functional theory. The obtained results unambiguously prove that the diffusion channels are l... [Phys. Rev. B 89, 165426] Published Mon Apr 28, 2014

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

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Plasmonic lifetimes and propagation lengths in metallodielectric superlattices (2014)

Goran Isić, Radoš Gajić, and Slobodan Vuković

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): Goran Isić, Radoš Gajić, and Slobodan Vuković We study the complex plasmonic band structure of nanoscopically thin metallodielectric layers. It is shown that the lifetime and propagation lengths can be obtained with excellent accuracy using a perturbation technique, thus establishing a quantitative connection between mode dissipation and its el... [Phys. Rev. B 89, 165427] Published Mon Apr 28, 2014

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

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Observation of type-II recombination in single wurtzite/zinc-blende GaAs heterojunction nanowires (2014)

Neimantas Vainorius, Daniel Jacobsson, Sebastian Lehmann, Anders Gustafsson, Kimberly A. Dick, Lars Samuelson, and Mats-Erik Pistol

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): Neimantas Vainorius, Daniel Jacobsson, Sebastian Lehmann, Anders Gustafsson, Kimberly A. Dick, Lars Samuelson, and Mats-Erik Pistol We have investigated a large set of individual wurtzite/zinc-blende GaAs heterojunction nanowires using transmission electron microscopy (TEM), photoluminescence (PL), and cathodoluminescence (CL). In several cases we have combined PL and TEM on the same wire. We find a fairly deep emission that sho... [Phys. Rev. B 89, 165423] Published Mon Apr 28, 2014

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

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Localization of large polarons in the disordered Holstein model (2014)

Oliver Robert Tozer and William Barford

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): Oliver Robert Tozer and William Barford We solve the disordered Holstein model via the density-matrix renormalization group method to investigate the combined roles of electron-phonon coupling and disorder on the localization of a single charge or exciton. The parameter regimes chosen, namely the adiabatic regime, ℏω/4t0=ω′〈1, and the ... [Phys. Rev. B 89, 155434] Published Mon Apr 28, 2014

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Role of surface passivation in the formation of Dirac states at polar surfaces of topological crystalline insulators: The case of SnTe(111) (2014)

S. V. Eremeev, Yu. M. Koroteev, I. A. Nechaev, and E. V. Chulkov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): S. V. Eremeev, Yu. M. Koroteev, I. A. Nechaev, and E. V. Chulkov We present ab initio density functional theory (DFT) calculation results for electronic and spin structures of both the Te- and Sn-terminated SnTe(111) polar surfaces. Rocksalt narrow-gap semiconductor SnTe belongs to the recently discovered class of topological crystalline insulators in which the t... [Phys. Rev. B 89, 165424] Published Mon Apr 28, 2014

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

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Topological phases in triangular lattices of Ru adsorbed on graphene: Ab initio calculations (2014)

C. Mera Acosta, Matheus P. Lima, R. H. Miwa, Antônio J. R. da Silva, and A. Fazzio

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): C. Mera Acosta, Matheus P. Lima, R. H. Miwa, Antônio J. R. da Silva, and A. Fazzio We have performed an ab initio investigation of the electronic properties of the graphene sheet adsorbed by Ru adatoms (Ru/graphene). For a particular set of triangular arrays of Ru adatoms, we find the formation of four (spin-polarized) Dirac cones attributed to a suitable overlap between two hexag... [Phys. Rev. B 89, 155438] Published Wed Apr 30, 2014

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