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Site dependence of the Kondo scale in CePd_{1−x} Rh_{x} due to Pd-Rh disorder (2015)

U. Stockert, S. Hartmann, M. Deppe, N. Caroca-Canales, J. G. Sereni, C. Geibel, and F. Steglich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): U. Stockert, S. Hartmann, M. Deppe, N. Caroca-Canales, J. G. Sereni, C. Geibel, and F. Steglich We present measurements of the thermopower S ( T ) on CePd 1 − x Rh x between 2 K and 300 K. For low Rh content, the system behaves as a ferromagnetic Kondo system with a Curie temperature T C of about 6 K, a Kondo scale smaller than T C , and an overall crystal electric field splitting of 210 K. As the Rh con… [Phys. Rev. B 92, 054415] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Torsion-induced effects in magnetic nanowires (2015)

Denis D. Sheka, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, and Yuri Gaididei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Denis D. Sheka, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, and Yuri Gaididei A magnetic helix wire is one of the simplest magnetic systems which manifests properties of both curvature and torsion. Possible equilibrium magnetization states in the helix wire with different anisotropy directions are studied theoretically. There exist two equilibrium states in the helix wire wit… [Phys. Rev. B 92, 054417] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Exchange bias effect in Au-Fe_{3} O_{4} dumbbell nanoparticles induced by the charge transfer from gold (2015)

Mikhail Feygenson, John C. Bauer, Zheng Gai, Carlos Marques, Meigan C. Aronson, Xiaowei Teng, Dong Su, Vesna Stanic, Volker S. Urban, Kevin A. Beyer, and Sheng Dai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Mikhail Feygenson, John C. Bauer, Zheng Gai, Carlos Marques, Meigan C. Aronson, Xiaowei Teng, Dong Su, Vesna Stanic, Volker S. Urban, Kevin A. Beyer, and Sheng Dai We have studied the origin of the exchange bias effect in the Au-Fe 3 O 4 dumbbell nanoparticles in two samples with different sizes of the Au seed nanoparticles (4.1 and 2.7 nm) and same size of Fe 3 O 4 nanoparticles (9.8 nm). The magnetization, small-angle neutron-scattering, synchrotron x-ray diffract… [Phys. Rev. B 92, 054416] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Large perpendicular magnetic anisotropy in magnetostrictive Fe_{1−x} Ga_{x} thin films (2015)

M. Barturen, J. Milano, M. Vásquez-Mansilla, C. Helman, M. A. Barral, A. M. Llois, M. Eddrief, and M. Marangolo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): M. Barturen, J. Milano, M. Vásquez-Mansilla, C. Helman, M. A. Barral, A. M. Llois, M. Eddrief, and M. Marangolo In this work we report the appearance of a large perpendicular magnetic anisotropy (PMA) in Fe 1 − x Ga x thin films grown onto ZnSe/GaAs(001). This arising anisotropy is related to the tetragonal metastable phase in as-grown samples recently reported [M. Eddrief et al. , Phys. Rev. B 84 , 161410 (2011) ].… [Phys. Rev. B 92, 054418] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Spin waves in one-dimensional bicomponent magnonic quasicrystals (2015)

J. Rychły, J. W. Kłos, M. Mruczkiewicz, and M. Krawczyk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): J. Rychły, J. W. Kłos, M. Mruczkiewicz, and M. Krawczyk We studied a finite Fibonacci sequence of Co and Py stripes aligned side by side and in direct contact with each other. Calculations based on a continuous model, including exchange and dipole interactions, were performed for structures feasible for fabrication and characterization of the main proper… [Phys. Rev. B 92, 054414] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Magnetization dynamics of coupled ferromagnetic disks (2015)

Olle Heinonen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Olle Heinonen The magnetization configuration in two stacked micron-size ferromagnetic disks can assume different equilibrium states depending on the interfacial coupling between the disks. Here I examine the magnetization dynamics in response to an out-of-plane field pulse for different equilibrium states. For a… [Phys. Rev. B 92, 054420] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Single-photon level study of microwave properties of lithium niobate at millikelvin temperatures (2015)

Maxim Goryachev, Nikita Kostylev, and Michael E. Tobar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Maxim Goryachev, Nikita Kostylev, and Michael E. Tobar The properties of doped and natural impurities in lithium niobate single crystals are studied using the whispering gallery mode method at low temperatures as a function of magnetic field. The study reveals considerable coupling of microwave photon modes to the Fe 3 + spin ensemble in iron-doped and no… [Phys. Rev. B 92, 060406(R)] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Critical suppression of spin Seebeck effect by magnetic fields (2015)

Takashi Kikkawa, Ken-ichi Uchida, Shunsuke Daimon, Zhiyong Qiu, Yuki Shiomi, and Eiji Saitoh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Takashi Kikkawa, Ken-ichi Uchida, Shunsuke Daimon, Zhiyong Qiu, Yuki Shiomi, and Eiji Saitoh The longitudinal spin Seebeck effect (LSSE) in Pt / Y 3 Fe 5 O 12 ( YIG ) junction systems has been investigated at various magnetic fields and temperatures. We found that the LSSE voltage in a Pt/YIG-slab system is suppressed by applying high magnetic fields and this suppression is critically enhanced at low… [Phys. Rev. B 92, 064413] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Skyrmion dynamics in chiral ferromagnets (2015)

Stavros Komineas and Nikos Papanicolaou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Stavros Komineas and Nikos Papanicolaou We study the dynamics of skyrmions in Dzyaloshinskii-Moriya materials with easy-axis anisotropy. An important link between topology and dynamics is established through the construction of unambiguous conservation laws obtained earlier in connection with magnetic bubbles and vortices. In particular, … [Phys. Rev. B 92, 064412] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Boosting domain wall propagation by notches (2015)

H. Y. Yuan and X. R. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): H. Y. Yuan and X. R. Wang We report a counterintuitive finding that notches in an otherwise homogeneous magnetic nanowire can boost current-induced domain wall (DW) propagation. DW motion in notch-modulated wires can be classified into three phases: (1) A DW is pinned around a notch when the current density is below the depi… [Phys. Rev. B 92, 054419] Published Mon Aug 10, 2015

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Suppression of the impurity-induced local magnetism by the opening of a spin pseudogap in Ni-doped Sr_{2} CuO_{3} (2015)

Yannic Utz, Franziska Hammerath, Satoshi Nishimoto, Christian Hess, Neela Sekhar Beesetty, Romuald Saint-Martin, Alexandre Revcolevschi, Bernd Büchner, and Hans-Joachim Grafe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Yannic Utz, Franziska Hammerath, Satoshi Nishimoto, Christian Hess, Neela Sekhar Beesetty, Romuald Saint-Martin, Alexandre Revcolevschi, Bernd Büchner, and Hans-Joachim Grafe The S = 1 / 2 antiferromagnetic Heisenberg spin chain compound Sr 2 CuO 3 doped with 1 % and 2 % of Ni impurities has been studied by means of Cu 63 nuclear magnetic resonance. A strong decrease of the spin-lattice relaxation rate T 1 − 1 at low temperatures points toward a spin gap, while a stretching exponent … [Phys. Rev. B 92, 060405(R)] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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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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Publikationsdatum: 2015-08-11

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-11

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-11

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-11

Beschreibung: 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

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

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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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Publikationsdatum: 2015-08-12

Beschreibung: 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

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

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Interfacial properties of LaMnO_{3} /LaNiO_{3} superlattices grown along (001) and (111) orientations (2015)

C. Piamonteze, M. Gibert, J. Heidler, J. Dreiser, S. Rusponi, H. Brune, J.-M. Triscone, F. Nolting, and U. Staub

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): C. Piamonteze, M. Gibert, J. Heidler, J. Dreiser, S. Rusponi, H. Brune, J.-M. Triscone, F. Nolting, and U. Staub We have employed x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) at the Ni and Mn L 3 , 2 edges in LaMnO 3 / LaNiO 3 superlattices grown along (001) and (111) orientations. Our results show a significant XMCD signal and thus the presence of magnetic moments localized on both Ni a… [Phys. Rev. B 92, 014426] Published Wed Jul 29, 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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Publikationsdatum: 2015-07-30

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-07-30

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-07-30

Beschreibung: 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

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

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Schwinger boson mean field perspective on emergent spins in diluted Heisenberg antiferromagnets (2015)

Shivam Ghosh, Hitesh J. Changlani, and Christopher L. Henley

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Shivam Ghosh, Hitesh J. Changlani, and Christopher L. Henley Using an adaptation of Schwinger boson mean field theory (SBMFT) for nonuniform systems, we study the nature of low-energy spin excitations on the square and Bethe lattices at their percolation threshold. The optimal SBMFT parameters are interpreted as on-site potentials and pairing amplitudes, whic… [Phys. Rev. B 92, 064401] Published Mon Aug 03, 2015

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Dynamics of photoinduced change of magnetoanisotropy parameter in orthoferrites probed with terahertz excited coherent spin precession (2015)

Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, and Tohru Suemoto

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, and Tohru Suemoto The effects of femtosecond laser excitation on the anisotropy parameter in orthoferrites ErFe O 3 and DyFe O 3 were probed through Faraday rotation induced by coherent spin precession, which was triggered by a terahertz pulse. Through the delayed frequency shift of the precession, gradual change in the … [Phys. Rev. B 92, 064404] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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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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Publikationsdatum: 2015-08-04

Beschreibung: 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

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

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Quantum pressure and chemical bonding: Influence of magnetic fields on electron localization (2015)

Jianmin Tao, Shi Liu, Fan Zheng, and Andrew M. Rappe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Jianmin Tao, Shi Liu, Fan Zheng, and Andrew M. Rappe Chemical bonding is the central concept of chemistry that has been used to explain the properties of molecules and solids as well as chemical processes. In recent years, considerable progress has been made toward a simple and yet fundamental understanding of this concept for isolated systems. Here w… [Phys. Rev. B 92, 060401(R)] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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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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Beschreibung: 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

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

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Thermal conductivity in large−J two-dimensional antiferromagnets: Role of phonon scattering (2015)

A. L. Chernyshev and Wolfram Brenig

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): A. L. Chernyshev and Wolfram Brenig Motivated by the recent heat transport experiments in two-dimensional antiferromagnets, such as La 2 CuO 4 , where the exchange coupling J is larger than the Debye energy Θ D , we discuss different types of relaxation processes for magnon heat current with a particular focus on coupling to three-dimension… [Phys. Rev. B 92, 054409] Published Wed Aug 05, 2015

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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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Publikationsdatum: 2015-08-06

Beschreibung: 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

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Fluctuation relations for spin currents (2015)

Chenjie Wang and D. E. Feldman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Chenjie Wang and D. E. Feldman The fluctuation theorem establishes general relations between transport coefficients and fluctuations in nonequilibrium systems. Recently there has been much interest in quantum fluctuation relations for electric currents. Since charge carriers also carry spin, it is important to extend the fluctuat… [Phys. Rev. B 92, 064406] Published Tue Aug 04, 2015

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Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures (2015)

Arianna Casiraghi, Teresa Rincón Domínguez, Stefan Rößler, Kévin J. A. Franke, Diego López González, Sampo J. Hämäläinen, Robert Frömter, Hans Peter Oepen, and Sebastiaan van Dijken

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Arianna Casiraghi, Teresa Rincón Domínguez, Stefan Rößler, Kévin J. A. Franke, Diego López González, Sampo J. Hämäläinen, Robert Frömter, Hans Peter Oepen, and Sebastiaan van Dijken In elastically coupled multiferroic heterostructures that exhibit full domain correlations between ferroelectric and ferromagnetic subsystems, magnetic domain walls are firmly pinned on top of ferroelectric domain boundaries. In this work, we investigate the influence of pinned magnetic domain walls… [Phys. Rev. B 92, 054406] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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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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Publikationsdatum: 2015-08-06

Beschreibung: 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

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Giant forward-scattering asymmetry and anomalous tunnel Hall effect at spin-orbit-split and exchange-split interfaces (2015)

T. Huong Dang, H. Jaffrès, T. L. Hoai Nguyen, and H.-J. Drouhin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): T. Huong Dang, H. Jaffrès, T. L. Hoai Nguyen, and H.-J. Drouhin We report on theoretical investigations of scattering asymmetry vs incidence of carriers through exchange barriers and magnetic tunnel junctions made of semiconductors involving spin-orbit interaction. By an analytical 2 × 2 spin model, we show that when Dresselhaus interaction is included in the cond… [Phys. Rev. B 92, 060403(R)] Published Wed Aug 05, 2015

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Intracluster interactions in butterfly {Fe_{3} LnO_{2} } molecules with the non-Kramers ions Tb(III) and Ho(III) (2015)

L. Badía-Romano, J. Rubín, F. Bartolomé, J. Bartolomé, J. Luzón, D. Prodius, C. Turta, V. Mereacre, F. Wilhelm, and A. Rogalev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): L. Badía-Romano, J. Rubín, F. Bartolomé, J. Bartolomé, J. Luzón, D. Prodius, C. Turta, V. Mereacre, F. Wilhelm, and A. Rogalev The intracluster exchange interactions within the “butterfly” [ Fe 3 Ln ( μ 3 − O ) 2 ( CCl 3 COO ) 8 ( H 2 O ) ( THF ) 3 ] molecules, where Ln(III) represents a lanthanide cation, have been determined by a combination of x-ray magnetic circular dichroism (XMCD) and vibrating sample magnetometry (VSM) along with an interacti… [Phys. Rev. B 92, 064411] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Surface-termination-dependent magnetism and strong perpendicular magnetocrystalline anisotropy of an FeRh(001) thin film (2015)

Soyoung Jekal, S. H. Rhim, S. C. Hong, Won-joon Son, and A. B. Shick

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Soyoung Jekal, S. H. Rhim, S. C. Hong, Won-joon Son, and A. B. Shick The magnetism of FeRh (001) films strongly depends on film thickness and surface terminations. While the magnetic ground state of bulk FeRh is G -type antiferromagnetism, the Rh-terminated films exhibit ferromagnetism with strong perpendicular magnetocrystalline anisotropy whose energy + 2.1 meV/□ is … [Phys. Rev. B 92, 064410] Published Thu Aug 06, 2015

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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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Publikationsdatum: 2015-08-08

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-08

Beschreibung: 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

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β-detected NMR spin relaxation in a thin film heterostructure of ferromagnetic EuO (2015)

W. A. Mac; Farlane, Q. Song, N. J. C. Ingle, K. H. Chow, M. Egilmez, I. Fan, M. D. Hossain, R. F. Kiefl, C. D. P. Levy, G. D. Morris, T. J. Parolin, M. R. Pearson, H. Saadaoui, Z. Salman, and D. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): W. A. MacFarlane, Q. Song, N. J. C. Ingle, K. H. Chow, M. Egilmez, I. Fan, M. D. Hossain, R. F. Kiefl, C. D. P. Levy, G. D. Morris, T. J. Parolin, M. R. Pearson, H. Saadaoui, Z. Salman, and D. Wang We present β -detected NMR measurements of the spin-lattice relaxation of Li + 8 implanted into an epitaxial heterostructure based on a 100 nm thick film of ferromagnetic (FM) EuO as a function of temperature through its FM transition. In the FM state, the spin-lattice relaxation rate follows the same … [Phys. Rev. B 92, 064409] Published Thu Aug 06, 2015

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Rényi entanglement entropy of critical SU(N) spin chains (2015)

Jonathan D'Emidio, Matthew S. Block, and Ribhu K. Kaul

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Jonathan D'Emidio, Matthew S. Block, and Ribhu K. Kaul We present a study of the scaling behavior of the Rényi entanglement entropy (REE) in SU ( N ) spin chain Hamiltonians, in which all of the spins transform under the fundamental representation. These SU ( N ) spin chains are known to be quantum critical and described by a well known Wess-Zumino-Witten (WZ… [Phys. Rev. B 92, 054411] Published Thu Aug 06, 2015

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Magnetism in tetragonal manganese-rich Heusler compounds (2015)

Lukas Wollmann, Stanislav Chadov, Jürgen Kübler, and Claudia Felser

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Lukas Wollmann, Stanislav Chadov, Jürgen Kübler, and Claudia Felser A comprehensive study of the total energy of manganese-rich Heusler compounds using density functional theory is presented. Starting from a large set of cubic parent systems, the response to tetragonal distortions is studied in detail. We single out the systems that remain cubic from those that most… [Phys. Rev. B 92, 064417] Published Tue Aug 18, 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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Publikationsdatum: 2015-08-19

Beschreibung: 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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Publikationsdatum: 2015-08-19

Beschreibung: 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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Publikationsdatum: 2015-08-20

Beschreibung: 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

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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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Publikationsdatum: 2015-08-21

Beschreibung: 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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Giant ferromagnetic π−d interaction in a phthalocyanine molecule (2015)

H. Murakawa, A. Kanda, M. Ikeda, M. Matsuda, and N. Hanasaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): H. Murakawa, A. Kanda, M. Ikeda, M. Matsuda, and N. Hanasaki We experimentally demonstrate that the ferromagnetic intramolecular π − d interaction works between an itinerant π -electron spin and a localized d -electron's magnetic moment in the iron-phthalocyanine (Pc) molecular compound. The evaluation of the hidden π − d coupling is achieved by preparing the isola… [Phys. Rev. B 92, 054429] Published Fri Aug 21, 2015

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Pressure-induced commensurate phase with potential giant polarization in YMn_{2} O_{5} (2015)

M. Deutsch, T. C. Hansen, M. T. Fernandez-Diaz, A. Forget, D. Colson, F. Porcher, and I. Mirebeau

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): M. Deutsch, T. C. Hansen, M. T. Fernandez-Diaz, A. Forget, D. Colson, F. Porcher, and I. Mirebeau We have studied multiferroic YMn 2 O 5 by high-pressure neutron diffraction in a large pressure range from 0.5 to 6.3 GPa. We observe a pressure-induced commensurate (PCM) phase with a propagation vector 1 2 0 1 2 that is different from those observed at ambient pressure. It coexists with the ambient press… [Phys. Rev. B 92, 060410(R)] Published Fri Aug 21, 2015

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Spin current generation and magnetic response in carbon nanotubes by the twisting phonon mode (2015)

Masato Hamada, Takehito Yokoyama, and Shuichi Murakami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Masato Hamada, Takehito Yokoyama, and Shuichi Murakami We theoretically investigate spin current and magnetic response induced by the twisting phonon mode in carbon nanotubes via the spin-rotation coupling. An effective magnetic field due to the twisting mode induces both spin and orbital magnetizations. The induced spin and orbital magnetizations have … [Phys. Rev. B 92, 060409(R)] Published Fri Aug 21, 2015

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Transmission through correlated Cu_{n} CoCu_{n} heterostructures (2015)

L. Chioncel, C. Morari, A. Östlin, W. H. Appelt, A. Droghetti, M. M. Radonjić, I. Rungger, L. Vitos, U. Eckern, and A. V. Postnikov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): L. Chioncel, C. Morari, A. Östlin, W. H. Appelt, A. Droghetti, M. M. Radonjić, I. Rungger, L. Vitos, U. Eckern, and A. V. Postnikov We propose a method to compute the transmission through correlated heterostructures by combining density functional and many-body dynamical mean field theories. The heart of this combination consists in porting the many-body self-energy from an all electron basis into a pseudopotential localized ato… [Phys. Rev. B 92, 054431] Published Mon Aug 24, 2015

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Universal scaling for a quantum discontinuity critical point and quantum quenches (2015)

Sei Suzuki and Amit Dutta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Sei Suzuki and Amit Dutta We introduce the notion of a quantum version of a discontinuity critical point (DCP) in the context of a first-order quantum phase transition referred to as a quantum DCP (QDCP). We evaluate the critical exponents associated with such a QDCP using the appropriate scaling relations focusing mainly on… [Phys. Rev. B 92, 064419] Published Mon Aug 24, 2015

Schlagwort(e): Magnetism

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Electronic and magnetic effects of a stacking fault in cobalt nanoscale islands on the Ag(111) surface (2015)

Keiji Doi, Emi Minamitani, Shunji Yamamoto, Ryuichi Arafune, Yasuo Yoshida, Satoshi Watanabe, and Yukio Hasegawa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Keiji Doi, Emi Minamitani, Shunji Yamamoto, Ryuichi Arafune, Yasuo Yoshida, Satoshi Watanabe, and Yukio Hasegawa By utilizing spin-polarized scanning tunneling microscopy (STM) and spectroscopy, we observe the coexistence of perpendicularly and in-plane magnetized cobalt nanoscale islands on an Ag(111) surface. The magnetization direction has the relationship with the observed moiré-corrugation amplitude on th… [Phys. Rev. B 92, 064421] Published Mon Aug 24, 2015

Schlagwort(e): Magnetism

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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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Beschreibung: 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

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

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Shape-dependent exchange bias effect in magnetic nanoparticles with core-shell morphology (2015)

V. Dimitriadis, D. Kechrakos, O. Chubykalo-Fesenko, and V. Tsiantos

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): V. Dimitriadis, D. Kechrakos, O. Chubykalo-Fesenko, and V. Tsiantos We study the low-temperature isothermal magnetic hysteresis of cubical and spherical nanoparticles with ferromagnetic-core/antiferromagnetic-shell morphology, in order to elucidate the sensitivity of the exchange bias effect to the shape of the particles and the structural imperfections at the core-… [Phys. Rev. B 92, 064420] 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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Beschreibung: 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

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

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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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Publikationsdatum: 2015-08-20

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-20

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-20

Beschreibung: 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

Schlagwort(e): 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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Beschreibung: 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

Schlagwort(e): 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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Beschreibung: 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

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

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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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Publikationsdatum: 2015-08-20

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-21

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-22

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-22

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-22

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-22

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-22

Beschreibung: 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

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

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Measuring acoustic mode resonance alone as a sensitive technique to extract antiferromagnetic coupling strength (2015)

Yajun Wei, Peter Svedlindh, Mikhail Kostylev, Mojtaba Ranjbar, Randy K. Dumas, and Johan Åkerman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Yajun Wei, Peter Svedlindh, Mikhail Kostylev, Mojtaba Ranjbar, Randy K. Dumas, and Johan Åkerman We have studied static and dynamic magnetic properties of a general asymmetric trilayer system using numerical simulations. For ferromagnetic, 90 ∘ , and antiferromagnetic coupling, the magnetizations of the two magnetic layers exhibit one, two, and three phases with increasing external field, respect… [Phys. Rev. B 92, 064418] Published Mon Aug 24, 2015

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Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance (2015)

Judit Romhányi, Guido Burkard, and András Pályi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Judit Romhányi, Guido Burkard, and András Pályi We theoretically study coherent subharmonic (multiphoton) transitions of a harmonically driven spin. We consider two cases: magnetic resonance (MR) with a misaligned, i.e., nontransversal, driving field, and electrically driven spin resonance (EDSR) of an electron confined in a one-dimensional, para… [Phys. Rev. B 92, 054422] Published Tue Aug 11, 2015

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Spin-wave dynamics in permalloy/cobalt magnonic crystals in the presence of a nonmagnetic spacer (2015)

P. Malagò, L. Giovannini, R. Zivieri, P. Gruszecki, and M. Krawczyk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): P. Malagò, L. Giovannini, R. Zivieri, P. Gruszecki, and M. Krawczyk In this paper, we theoretically study the influence of a nonmagnetic spacer between ferromagnetic dots and a ferromagnetic matrix on the frequency dispersion of the spin-wave excitations in two-dimensional bicomponent magnonic crystals. By means of the dynamical matrix method we investigate structur… [Phys. Rev. B 92, 064416] Published Wed Aug 12, 2015

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Direct and inverse spin-orbit torques (2015)

Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov The connection between the spin-orbit torque (SOT) and inverse spin-orbit torque (ISOT) in systems without inversion symmetry is studied by combining phenomenological models, diffusion theory, and density functional theory. Using this, DFT calculations on Co/Pt(111) magnetic bilayers expose the mechanisms underlying SOT and ISOT and highlight their reciprocity on the microscopic level. [Phys. Rev. B 92, 064415] Published Wed Aug 12, 2015

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Gapless chiral spin liquid in a kagome Heisenberg model (2015)

Samuel Bieri, Laura Messio, Bernard Bernu, and Claire Lhuillier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Samuel Bieri, Laura Messio, Bernard Bernu, and Claire Lhuillier Motivated by recent experiments on the Heisenberg S = 1 / 2 quantum spin liquid candidate material kapellasite, we classify all possible chiral (time-reversal symmetry breaking) spin liquids with fermionic spinons on the kagome lattice. We obtain the phase diagram for the physically relevant extended He… [Phys. Rev. B 92, 060407(R)] Published Fri Aug 14, 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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Publikationsdatum: 2015-08-15

Beschreibung: 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

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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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Publikationsdatum: 2015-08-15

Beschreibung: 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

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

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Effect of structure on the magnetic anisotropy of L1_{0} FePt nanoparticles (2015)

Alamgir Kabir, Jun Hu, Volodymyr Turkowski, Ruqian Wu, Robert Camley, and Talat S. Rahman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Alamgir Kabir, Jun Hu, Volodymyr Turkowski, Ruqian Wu, Robert Camley, and Talat S. Rahman We carry out a systematic theoretical investigation of magnetocrystalline anisotropy (MCA) of L 1 0 FePt clusters with alternating Fe and Pt planes along the (001) direction. The clusters studied contain 30–484 atoms. We calculate the structural relaxation and magnetic moment of each cluster by using … [Phys. Rev. B 92, 054424] Published Thu Aug 13, 2015

Schlagwort(e): Magnetism

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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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Publikationsdatum: 2015-07-30

Beschreibung: 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

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

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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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Publikationsdatum: 2015-08-04

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-04

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-04

Beschreibung: 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

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

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Magnetization of a quantum spin system induced by a linear polarized laser (2015)

A. A. Zvyagin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): A. A. Zvyagin It is shown that a linear polarized laser can cause magnetization of a spin system with magnetic anisotropy, the distinguished axis of which is perpendicular to the polarization of the laser field. In the dynamical regime the magnetization oscillates around the nonzero value determined by the parame… [Phys. Rev. B 92, 054405] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Relative strength of thermal and electrical spin currents in a ferromagnetic tunnel contact on a semiconductor (2015)

K.-R. Jeon, H. Saito, S. Yuasa, and R. Jansen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): K.-R. Jeon, H. Saito, S. Yuasa, and R. Jansen The relative magnitude of electrical and thermal spin currents is investigated for a ferromagnetic tunnel contact on a semiconductor. A direct quantitative comparison is made by simultaneously generating electrical and thermal spin currents of opposite sign and determining the compensation point at … [Phys. Rev. B 92, 054403] Published Tue Aug 04, 2015

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Observation of pure inverse spin Hall effect in ferromagnetic metals via ferromagnetic/antiferromagnetic exchange-bias structures (2015)

H. Wu, C. H. Wan, Z. H. Yuan, X. Zhang, J. Jiang, Q. T. Zhang, Z. C. Wen, and X. F. Han

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): H. Wu, C. H. Wan, Z. H. Yuan, X. Zhang, J. Jiang, Q. T. Zhang, Z. C. Wen, and X. F. Han We report that the spin current generated by the spin Seebeck effect (SSE) in yttrium iron garnet (YIG) can be detected by a ferromagnetic metal (NiFe). By using the ferromagnetic/antiferromagnetic (FM/AFM) exchange bias structure (NiFe/IrMn), the inverse spin Hall effect (ISHE) and planar Nernst ef… [Phys. Rev. B 92, 054404] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Spin dynamics in pressure-induced magnetically ordered phases in (C_{4} H_{12} N_{2} )Cu_{2} Cl_{6} (2015)

G. Perren, J. S. Möller, D. Hüvonen, A. A. Podlesnyak, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): G. Perren, J. S. Möller, D. Hüvonen, A. A. Podlesnyak, and A. Zheludev Organic molecular magnets like piperazinium hexachlorodicuprate (PHCC) have attracted interest due to their sensitivity to pressure which presents possibilities for pressure-induced quantum phase transitions. Previous neutron and muon studies of PHCC gave differing indications of how the spin gap in this material varied with applied pressure. The authors of this work have resolved this discrepancy by further neutron scattering results showing that the spin gap has dissipated completely by 9 kbar, in agreement with the previous muon data. The authors also present a model in which the results are explained by the weakening of a single exchange pathway. [Phys. Rev. B 92, 054413] Published Fri Aug 07, 2015

Schlagwort(e): Magnetism

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Geometrical effects in orbital magnetic susceptibility (2015)

Yang Gao, Shengyuan A. Yang, and Qian Niu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Yang Gao, Shengyuan A. Yang, and Qian Niu Within the wave-packet semiclassical approach, the Bloch electron energy is derived to second order in the magnetic field and classified into gauge-invariant terms with clear physical meaning, yielding a fresh understanding of the complex behavior of orbital magnetic susceptibility. The Berry curvat... [Phys. Rev. B 91, 214405] Published Wed Jun 03, 2015

Schlagwort(e): Magnetism

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Stimulated thermalization of a parametrically driven magnon gas as a prerequisite for Bose-Einstein magnon condensation (2015)

P. Clausen, D. A. Bozhko, V. I. Vasyuchka, B. Hillebrands, G. A. Melkov, and A. A. Serga

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): P. Clausen, D. A. Bozhko, V. I. Vasyuchka, B. Hillebrands, G. A. Melkov, and A. A. Serga Thermalization of a parametrically driven magnon gas leading to the formation of a Bose-Einstein condensate at the bottom of a spin-wave spectrum was studied by time- and wave-vector-resolved Brillouin light scattering spectroscopy. It has been found that the condensation is preceded by the conversi... [Phys. Rev. B 91, 220402(R)] Published Wed Jun 03, 2015

Schlagwort(e): Magnetism

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Direct observation of noncollinear order of Co and Mn moments in multiferroic Mn_{0.85}Co_{0.15}WO_{4} (2015)

J. Herrero-Martín, A. N. Dobrynin, C. Mazzoli, P. Steadman, P. Bencok, R. Fan, A. A. Mukhin, V. Skumryev, and J. L. García-Muñoz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): J. Herrero-Martín, A. N. Dobrynin, C. Mazzoli, P. Steadman, P. Bencok, R. Fan, A. A. Mukhin, V. Skumryev, and J. L. García-Muñoz Doping M n 1 − x C o x W O 4 with Co produces a rich magnetic phase diagram with a large number of ferroelectric phases. We present resonant x-ray magnetic scattering experiments in the known collinear AF4 phase of multiferroic M n 0.85 C o 0.15 W O 4 showing that Mn and Co spins point to different directions despite... [Phys. Rev. B 91, 220403(R)] Published Wed Jun 03, 2015

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Quasi-two-dimensional spin and phonon excitations in La_{1.965}Ba_{0.035}CuO_{4} (2015)

J. J. Wagman, D. Parshall, M. B. Stone, A. T. Savici, Y. Zhao, H. A. Dabkowska, and B. D. Gaulin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): J. J. Wagman, D. Parshall, M. B. Stone, A. T. Savici, Y. Zhao, H. A. Dabkowska, and B. D. Gaulin We present time-of-flight inelastic neutron scattering measurements of La 1.965 Ba 0.035 CuO 4 (LBCO), a lightly doped member of the high temperature superconducting La-based cuprate family. By using time-of-flight neutron instrumentation coupled with single crystal sample rotation we obtain a four-dimen... [Phys. Rev. B 91, 224404] Published Wed Jun 03, 2015

Schlagwort(e): Magnetism

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Magnetic spin-flop transition and interlayer spin-wave dispersion in PrCaFeO_{4} revealed by neutron diffraction and inelastic neutron scattering (2015)

N. Qureshi, M. Valldor, L. Weber, A. Senyshyn, Y. Sidis, and M. Braden

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): N. Qureshi, M. Valldor, L. Weber, A. Senyshyn, Y. Sidis, and M. Braden We present a comprehensive study on PrCaFeO 4 using macroscopic methods, neutron and x-ray diffraction, as well as inelastic neutron scattering. One polycrystalline and two single-crystal samples were investigated exhibiting structural phase transitions from a high-temperature tetragonal phase to an ... [Phys. Rev. B 91, 224402] Published Tue Jun 02, 2015

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Magnetic phase diagram of the coupled triangular spin tubes for CsCrF_{4} (2015)

Kouichi Seki and Kouichi Okunishi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Kouichi Seki and Kouichi Okunishi Using Monte Carlo simulations, we explore the magnetic phase diagram of triangular spin tubes coupled with a ferromagnetic intertube interaction for CsCrF 4 . The planar structure of the coupled tubes is topologically equivalent to the kagome-triangular lattice, which induces nontrivial frustration ef... [Phys. Rev. B 91, 224403] Published Tue Jun 02, 2015

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Inverse spin Hall effect in Cr: Independence of antiferromagnetic ordering (2015)

D. Qu, S. Y. Huang, and C. L. Chien

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): D. Qu, S. Y. Huang, and C. L. Chien Chromium is a 3 d spin-density wave antiferromagnetic (AF) metal with a Néel temperature of 311 K. By using the thermal spin injection method, we have observed a large inverse spin Hall voltage in Cr. With a negligible magnetic proximity effect and a large spin Hall angle, Cr is an intrinsic pure spi… [Phys. Rev. B 92, 020418(R)] Published Wed Jul 29, 2015

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Thickness-dependent magnetic properties and strain-induced orbital magnetic moment in SrRuO_{3} thin films (2015)

K. Ishigami, K. Yoshimatsu, D. Toyota, M. Takizawa, T. Yoshida, G. Shibata, T. Harano, Y. Takahashi, T. Kadono, V. K. Verma, V. R. Singh, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, T. Koide, M. Oshima, H. Kumigashira, and A. Fujimori

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): K. Ishigami, K. Yoshimatsu, D. Toyota, M. Takizawa, T. Yoshida, G. Shibata, T. Harano, Y. Takahashi, T. Kadono, V. K. Verma, V. R. Singh, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, T. Koide, M. Oshima, H. Kumigashira, and A. Fujimori Thin films of the ferromagnetic metal SrRuO 3 (SRO) show a varying easy magnetization axis depending on the epitaxial strain, and undergo a metal-to-insulator transition with decreasing film thickness. We have investigated the magnetic properties of SRO thin films with varying thicknesses fabricated … [Phys. Rev. B 92, 064402] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Ultrafast magnetization dynamics: Microscopic electronic configurations and ultrafast spectroscopy (2015)

I. L. M. Locht, I. Di Marco, S. Garnerone, A. Delin, and M. Battiato

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): I. L. M. Locht, I. Di Marco, S. Garnerone, A. Delin, and M. Battiato We provide an approach for the identification of the electronic and magnetic configurations of ferromagnetic Fe after an ultrafast decrease or increase of the magnetization. The model is based on the well-grounded assumption that, after an ultrafast variation of the magnetization, the system achieve… [Phys. Rev. B 92, 064403] Published Mon Aug 03, 2015

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Thermal vector potential theory of magnon-driven magnetization dynamics (2015)

Gen Tatara

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Gen Tatara Thermal vector potential formulation is applied to study the thermal dynamics of magnetic structures for insulating ferromagnets. By separating the variables of the magnetic structure and the magnons, the equation of motion for the structure, including spin-transfer effect because of thermal magnons… [Phys. Rev. B 92, 064405] Published Mon Aug 03, 2015

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Axially and radially quantized spin waves in thick permalloy nanodots (2015)

X. Zhou, D. Kumar, I. S. Maksymov, M. Kostylev, and A. O. Adeyeye

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): X. Zhou, D. Kumar, I. S. Maksymov, M. Kostylev, and A. O. Adeyeye We have investigated the spin wave modes in perpendicularly magnetized permalloy nanodots as a function of film thickness using field modulated perpendicular ferromagnetic resonance spectroscopy. We observed mode intensity inversion with an increase in dot thickness. In thicker dots, one ellusive an… [Phys. Rev. B 92, 054401] Published Mon Aug 03, 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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Publikationsdatum: 2015-08-04

Beschreibung: 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

Schlagwort(e): 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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Publikationsdatum: 2015-08-04

Beschreibung: 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

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

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Ferrimagnetic resonance and magnetoelastic excitations in magnetoelectric hexaferrites (2015)

Carmine Vittoria

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Carmine Vittoria Static field properties of magnetoelectric hexaferrites have been explored extensively in the past five years. In this paper, dynamic properties of magnetoelectric hexaferrites are being explored. In particular, effects of the linear magnetoelectric coupling ( α ) on ferrimagnetic resonance (FMR) and … [Phys. Rev. B 92, 064407] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Thema: Physik

Publiziert von American Physical Society (APS)

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Accurate calculation of the transverse anisotropy of a magnetic domain wall in perpendicularly magnetized multilayers (2015)

Felix Büttner, Benjamin Krüger, Stefan Eisebitt, and Mathias Kläui

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Felix Büttner, Benjamin Krüger, Stefan Eisebitt, and Mathias Kläui Bloch domain walls are the most common type of transition between two out-of-plane magnetized domains (one magnetized upwards, one downwards) in films with perpendicular magnetic anisotropy. The rotation of the spins of such domain walls in the plane of the film requires energy, which is described b… [Phys. Rev. B 92, 054408] Published Wed Aug 05, 2015

Schlagwort(e): Magnetism

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Thema: Physik

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Magnetic model in multiferroic NdFe_{3} (BO_{3} )_{4} investigated by inelastic neutron scattering (2015)

S. Hayashida, M. Soda, S. Itoh, T. Yokoo, K. Ohgushi, D. Kawana, H. M. Rønnow, and T. Masuda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): S. Hayashida, M. Soda, S. Itoh, T. Yokoo, K. Ohgushi, D. Kawana, H. M. Rønnow, and T. Masuda We performed inelastic neutron scattering measurements on single crystals of NdFe 3 ( BO 3 11 ) 4 to explore the magnetic excitations, to establish the underlying Hamiltonian, and to reveal the detailed nature of hybridization between the 4 f and 3 d magnetism. The observed spectra exhibiting a couple of key… [Phys. Rev. B 92, 054402] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Thema: Physik

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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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Publikationsdatum: 2015-08-08

Beschreibung: 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

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

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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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Publikationsdatum: 2015-08-08

Beschreibung: 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

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

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

L. L. Marnham and A. V. Shytov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

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

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

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Multiscale modeling of ultrafast element-specific magnetization dynamics of ferromagnetic alloys (2015)

D. Hinzke, U. Atxitia, K. Carva, P. Nieves, O. Chubykalo-Fesenko, P. M. Oppeneer, and U. Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): D. Hinzke, U. Atxitia, K. Carva, P. Nieves, O. Chubykalo-Fesenko, P. M. Oppeneer, and U. Nowak A hierarchical multiscale approach to model the magnetization dynamics of ferromagnetic random alloys is presented. First-principles calculations of the Heisenberg exchange integrals are linked to atomistic spin models based upon the stochastic Landau-Lifshitz-Gilbert (LLG) equation to calculate tem… [Phys. Rev. B 92, 054412] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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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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Publikationsdatum: 2015-08-08

Beschreibung: 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

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

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