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Topological magnetic dipolar interaction and nonlocal electric magnetization control in topological insulator heterostructures (2016)

Stefan Rex, Flavio S. Nogueira, and Asle Sudbø

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-09

Description: Author(s): Stefan Rex, Flavio S. Nogueira, and Asle Sudbø The magnetoelectric effect predicted in topological insulators makes heterostructures that combine magnetic materials and such insulators promising candidates for spintronics applications. Here, we theoretically consider a setup that exhibits two well-separated interfaces between a topological insul… [Phys. Rev. B 94, 020404(R)] Published Thu Jul 07, 2016

Keywords: Magnetism

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

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Classification of magnons in rotated ferromagnetic Heisenberg model and their competing responses in transverse fields (2016)

Fadi Sun, Jinwu Ye, and Wu-Ming Liu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-09

Description: Author(s): Fadi Sun, Jinwu Ye, and Wu-Ming Liu In this paper, we study the rotated ferromagnetic Heisenberg model (RFHM) in two different transverse fields, h x and h z , which can be intuitively visualized as studying spin-orbit coupling (SOC) effects in two-dimensional (2D) Ising or anisotropic X Y model in a transverse field. At a special SOC cla… [Phys. Rev. B 94, 024409] Published Thu Jul 07, 2016

Keywords: Magnetism

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Multiscale modeling of polycrystalline graphene: A comparison of structure and defect energies of realistic samples from phase field crystal models (2016)

Petri Hirvonen, Mikko M. Ervasti, Zheyong Fan, Morteza Jalalvand, Matthew Seymour, S. Mehdi Vaez Allaei, Nikolas Provatas, Ari Harju, Ken R. Elder, and Tapio Ala-Nissila

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-12

Description: Author(s): Petri Hirvonen, Mikko M. Ervasti, Zheyong Fan, Morteza Jalalvand, Matthew Seymour, S. Mehdi Vaez Allaei, Nikolas Provatas, Ari Harju, Ken R. Elder, and Tapio Ala-Nissila We extend the phase field crystal (PFC) framework to quantitative modeling of polycrystalline graphene. PFC modeling is a powerful multiscale method for finding the ground state configurations of large realistic samples that can be further used to study their mechanical, thermal, or electronic prope… [Phys. Rev. B 94, 035414] Published Mon Jul 11, 2016

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

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Electron diffraction by plasmon waves (2016)

F. J. García de Abajo, B. Barwick, and F. Carbone

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-12

Description: Author(s): F. J. García de Abajo, B. Barwick, and F. Carbone The properties of an electron beam can be manipulated by electromagnetic fields in vacuum via the ponderomotive force. Such an interaction is also at the core of the Kapitza-Dirac effect, which describes the diffraction of electrons by an optical standing wave. Here, the authors predict a new type of interaction between electrons and the electromagnetic field, opening up new possibilities for the manipulation of electron beams. If surface plasmon polaritons are tailored to interfere forming a periodic field pattern, it becomes possible to diffract electrons from such near field. With the proper manipulation of the plasmonic fields, orbital angular momentum can be imparted to the electrons, and even the phase of their wave functions can be manipulated. An additional degree of freedom is provided by the possibility to tailor the spatial properties of the light and the materials supporting the surface plasmons. This arbitrary control can be extended to different substrates such as graphene or layered systems and may open up a viable route to create tunable phase plates for electron microscopes. [Phys. Rev. B 94, 041404(R)] Published Mon Jul 11, 2016

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

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Inverted pendulum state of a polariton Rabi oscillator (2016)

N. S. Voronova, A. A. Elistratov, and Yu. E. Lozovik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-12

Description: Author(s): N. S. Voronova, A. A. Elistratov, and Yu. E. Lozovik Exciton-photon beats known as polariton Rabi oscillations in semiconductor microcavities are usually excited by short pulses of light. We consider a different pumping scheme, assuming a cw pumping of the Rabi oscillator from an exciton reservoir. We account for the initial pulse of light setting the… [Phys. Rev. B 94, 045413] Published Mon Jul 11, 2016

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

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Tomography of Majorana fermions with STM tips (2016)

Denis Chevallier and Jelena Klinovaja

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-13

Description: Author(s): Denis Chevallier and Jelena Klinovaja We investigate numerically the possibility to detect the spatial profile of Majorana fermions (MFs) by using STM tips that are made of either normal or superconducting material. In both cases, we are able to resolve the localization length and the oscillation period of the MF wave function. We show … [Phys. Rev. B 94, 035417] Published Tue Jul 12, 2016

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

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Impurity invisibility in graphene: Symmetry guidelines for the design of efficient sensors (2016)

John Duffy, James Lawlor, Caio Lewenkopf, and Mauro S. Ferreira

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-13

Description: Author(s): John Duffy, James Lawlor, Caio Lewenkopf, and Mauro S. Ferreira Renowned for its sensitivity to detect the presence of numerous substances, graphene is an excellent chemical sensor. Unfortunately, which general features a dopant must have in order to enter the list of substances detectable by graphene are not exactly known. Here we demonstrate with a simple mode… [Phys. Rev. B 94, 045417] Published Tue Jul 12, 2016

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

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Observing single-atom diffusion at a molecule-metal interface (2016)

Johannes Mielke, Jesús Martínez-Blanco, Maike V. Peters, Stefan Hecht, and Leonhard Grill

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-13

Description: Author(s): Johannes Mielke, Jesús Martínez-Blanco, Maike V. Peters, Stefan Hecht, and Leonhard Grill The dynamics at the interface between a close-packed porphyrin monolayer and Au(111) is investigated by time-dependent scanning tunneling microscopy, detecting the motion of single-interface adatoms in real space. Imaging sequences reveal predominant switching of the molecular appearance in adjacent… [Phys. Rev. B 94, 035416] Published Tue Jul 12, 2016

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

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Mapping the intramolecular contributions to the inelastic electron tunneling signal of a molecular junction (2016)

Giuseppe Foti and Héctor Vázquez

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-13

Description: Author(s): Giuseppe Foti and Héctor Vázquez We present a quantitative analysis of the intramolecular origin of the inelastic electron tunneling signal of a molecular junction. We use density-functional theory to study a representative conjugated molecule with a low degree of symmetry and calculate, for all modes, the different contributions t… [Phys. Rev. B 94, 045418] Published Tue Jul 12, 2016

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

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Entanglement and Majorana edge states in the Kitaev model (2016)

Saptarshi Mandal, Moitri Maiti, and Vipin Kerala Varma

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-13

Description: Author(s): Saptarshi Mandal, Moitri Maiti, and Vipin Kerala Varma We investigate the von Neumann entanglement entropy and Schmidt gap in the vortex-free ground state of the Kitaev model on the honeycomb lattice for square/rectangular and cylindrical subsystems. We find that, for both the subsystems, the free-fermionic contribution to the entanglement entropy S E ex… [Phys. Rev. B 94, 045421] Published Tue Jul 12, 2016

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

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