Physical Review B

/Physical Review B

Screening of long-range Coulomb interaction in graphene nanoribbons: Armchair versus zigzag edges

2018-11-14T16:33:30+00:00November 14th, 2018|Categories: Publications|Tags: |

Author(s): H. Hadipour, E. Şaşıoğlu, F. Bagherpour, C. Friedrich, S. Blügel, and I. MertigWe study the electronic screening of the long-range Coulomb interaction in graphene nanoribbons (GNRs) with armchair and zigzag edges as a function of the ribbon width by employing ab initio calculations in conjunction with the random-phase approximation. We find that in GNRs with armchair edges qua…[Phys. Rev. B 98, 205123] Published Wed Nov 14, 2018

Published in: "Physical Review B".

Spin transport in a graphene normal-superconductor junction in the quantum Hall regime

2018-11-13T16:33:57+00:00November 13th, 2018|Categories: Publications|Tags: , , |

Author(s): Tibor Sekera, Christoph Bruder, and Rakesh P. TiwariIn graphene-superconductor heterostructures, superconductivity and the quantum Hall effect may coexist for an experimentally accessible range of magnetic fields. When the graphene edge states are coupled to a superconductor in the presence of a Zeeman field, the charge carriers with one spin projection get transmitted while the ones with the opposite spin projection get reflected within a certain energy region. This spin-filtering effect is a consequence of the interplay between specular Andreev reflections and Andreev retro-reflections. While the edge termination of graphene and the geometrical details do matter for the charge conductance, they have little effect on the spin polarization of the charge carriers.[Phys. Rev. B 98, 195418] Published Tue Nov 13, 2018

Published in: "Physical Review B".

Oxidation effect on the shear strength of graphene on aluminum and titanium surfaces

2018-11-13T16:33:54+00:00November 13th, 2018|Categories: Publications|Tags: , |

Author(s): Soumendu Bagchi, Changhong Ke, and Huck Beng ChewWe report the interfacial shear strength of graphene on pure and oxidized Ti and Al metal surfaces using density functional theory calculations. Our results show significant changes to the graphene-metal bonding properties in the presence of an oxide phase. In particular, the strongly chemisorbed in…[Phys. Rev. B 98, 174106] Published Tue Nov 13, 2018

Published in: "Physical Review B".

Counterpropagating topological interface states in graphene patchwork structures with regular arrays of nanoholes

2018-11-13T16:33:45+00:00November 13th, 2018|Categories: Publications|Tags: |

Author(s): Toshikaze Kariyado, Yong-Cheng Jiang, Hongxin Yang, and Xiao HuTopological properties of graphene with nanoholes are theoretically investigated in detail. It is revealed that two types of hole arrangements, honeycomb array and triangular array, give rise to two topologically distinct states. We give a concise two-step strategy for choosing array structures, whe…[Phys. Rev. B 98, 195416] Published Tue Nov 13, 2018

Published in: "Physical Review B".

Linear response of twisted bilayer graphene: Continuum versus tight-binding models

2018-11-12T20:33:55+00:00November 12th, 2018|Categories: Publications|Tags: |

Author(s): T. Stauber, T. Low, and G. Gómez-SantosWe present a linear response calculation for twisted bilayer graphene. The calculation is performed for both the continuum and tight-binding models, with the aim of assessing the validity of the former. All qualitatively important features previously reported by us [Stauber et al., Phys. Rev. Lett….[Phys. Rev. B 98, 195414] Published Mon Nov 12, 2018

Published in: "Physical Review B".

Spatial control of carrier capture in two-dimensional materials: Beyond energy selection rules

2018-11-09T20:33:11+00:00November 9th, 2018|Categories: Publications|Tags: , |

Author(s): Roberto Rosati, Frank Lengers, Doris E. Reiter, and Tilmann KuhnThe carrier capture from a two-dimensional transition metal dichalcogenide monolayer into a quasi-zero-dimensional potential is a decisive process to exploit these remarkable materials as, e.g., single-photon sources. Here, we study theoretically the phonon-induced carrier capture in a MoSe2 monolay…[Phys. Rev. B 98, 195411] Published Fri Nov 09, 2018

Published in: "Physical Review B".

Fraunhofer response and supercurrent spin switching in black phosphorus with strain and disorder

2018-11-09T18:35:33+00:00November 9th, 2018|Categories: Publications|Tags: |

Author(s): Mohammad Alidoust, Morten Willatzen, and Antti-Pekka JauhoWe develop theory models for both ballistic and disordered superconducting monolayer black phosphorus devices in the presence of magnetic exchange field and stress. The ballistic case is studied through a microscopic Bogoliubov–de Gennes formalism, while for the disordered case we formulate a quasic…[Phys. Rev. B 98, 184505] Published Fri Nov 09, 2018

Published in: "Physical Review B".

Optical absorption properties of few-layer phosphorene

2018-11-09T18:35:27+00:00November 9th, 2018|Categories: Publications|Tags: |

Author(s): Zahra Torbatian and Reza AsgariWe investigate the optical absorption and transmission of few-layer phosphorene in the framework of ab initio density functional simulations and many-body perturbation theory at the level of random-phase approximation. In bilayer phosphorene, the optical transition of the valence band to the conduct…[Phys. Rev. B 98, 205407] Published Fri Nov 09, 2018

Published in: "Physical Review B".

Gate-tunable infrared plasmons in electron-doped single-layer antimony

2018-11-09T16:34:02+00:00November 9th, 2018|Categories: Publications|Tags: |

Author(s): D. A. Prishchenko, V. G. Mazurenko, M. I. Katsnelson, and A. N. RudenkoWe report on a theoretical study of collective electronic excitations in single-layer antimony crystals (antimonene), a novel two-dimensional semiconductor with strong spin-orbit coupling. Based on a tight-binding model, we consider electron-doped antimonene and demonstrate that the combination of s…[Phys. Rev. B 98, 201401(R)] Published Fri Nov 09, 2018

Published in: "Physical Review B".

Energy losses and transition radiation in graphene traversed by a fast charged particle under oblique incidence

2018-11-08T20:33:14+00:00November 8th, 2018|Categories: Publications|Tags: , |

Author(s): Kamran Akbari, Silvina Segui, Zoran L. Mišković, Juana L. Gervasoni, and Néstor R. AristaWe perform fully relativistic calculations of the energy loss channels for a charged particle traversing a single layer of graphene under oblique incidence in a setting pertinent to a scanning transmission electron microscope (STEM), where we distinguish between the energy deposited in graphene in t…[Phys. Rev. B 98, 195410] Published Thu Nov 08, 2018

Published in: "Physical Review B".

Supervised learning approach for recognizing magnetic skyrmion phases

2018-11-07T18:34:09+00:00November 7th, 2018|Categories: Publications|

Author(s): I. A. Iakovlev, O. M. Sotnikov, and V. V. MazurenkoWe propose and apply simple machine learning approaches for recognition and classification of complex noncollinear magnetic structures in two-dimensional materials. The first approach is based on the implementation of the single-hidden-layer neural network that only relies on the z projections of th…[Phys. Rev. B 98, 174411] Published Wed Nov 07, 2018

Published in: "Physical Review B".

Nonperturbative nonlinear effects in the dispersion relations for TE and TM plasmons on two-dimensional materials

2018-11-07T16:35:34+00:00November 7th, 2018|Categories: Publications|

Author(s): Vera Andreeva, Mitchell Luskin, and Dionisios MargetisWe analytically obtain the dispersion relations for transverse-electric (TE) and transverse-magnetic (TM) surface plasmon-polaritons in a nonlinear two-dimensional (2D) conducting material with inversion symmetry lying between two Kerr-type dielectric media. To this end, we use Maxwell’s equations w…[Phys. Rev. B 98, 195407] Published Wed Nov 07, 2018

Published in: "Physical Review B".

Coulomb effects in the absorbance spectra of two-dimensional Dirac materials

2018-11-02T16:34:20+00:00November 2nd, 2018|Categories: Publications|Tags: , |

Author(s): Leone Di Mauro Villari, Ian Galbraith, and Fabio BiancalanaA wide range of materials like graphene, topological insulators, and transition-metal dichalcogenides (TMDs) share an interesting property: the low-energy excitations behave as Dirac particles. This emergent behavior of Dirac quasiparticles defines a large class of media that are usually called Dira…[Phys. Rev. B 98, 205402] Published Fri Nov 02, 2018

Published in: "Physical Review B".

Strain-induced superconducting pair density wave states in graphene

2018-11-02T16:34:18+00:00November 2nd, 2018|Categories: Publications|Tags: |

Author(s): Feng Xu, Po-Hao Chou, Chung-Hou Chung, Ting-Kuo Lee, and Chung-Yu MouGraphene is known to be nonsuperconducting. However, surprising superconductivity is recently discovered in a flat band in a twisted bilayer graphene. Here, we show that superconductivity can be more easily realized in topological flat bands induced by strain in graphene through periodic ripples. Sp…[Phys. Rev. B 98, 205103] Published Fri Nov 02, 2018

Published in: "Physical Review B".

Elastic response of the electron fluid in intrinsic graphene: The collisionless regime

2018-11-02T16:34:15+00:00November 2nd, 2018|Categories: Publications|Tags: , |

Author(s): Julia M. Link, Daniel E. Sheehy, Boris N. Narozhny, and Jörg SchmalianThe frequency-dependent dynamic motion of electrons in graphene is similar to that of an elastic medium, exhibiting viscous flow. Here, the authors demonstrate that, in intrinsic graphene, the dynamical viscosity and the dynamical elastic constants are linked and control the nonlocal energy flow of the system. By computing graphene’s dynamic viscosity, the authors show that contributions due to single-particle motion – as in dilute gases – are comparable in magnitude to contributions due to many-body effects, similar to viscous substances like honey.[Phys. Rev. B 98, 195103] Published Fri Nov 02, 2018

Published in: "Physical Review B".

Exchange interaction of magnetic impurities in a biased bilayer phosphorene nanoribbon

2018-11-02T16:34:12+00:00November 2nd, 2018|Categories: Publications|Tags: |

Author(s): Moslem Zare and Ebrahim SadeghiWe study the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between local magnetic moments in zigzag bilayer phosphorene nanoribbons (ZBLPNRs) under a perpendicular electric field. We evaluate the spatial and electric field dependency of the static spin susceptibility in real space in various conf…[Phys. Rev. B 98, 205401] Published Fri Nov 02, 2018

Published in: "Physical Review B".

Pairing symmetry and spontaneous vortex-antivortex lattice in superconducting twisted-bilayer graphene: Bogoliubov-de Gennes approach

2018-11-01T16:33:33+00:00November 1st, 2018|Categories: Publications|Tags: |

Author(s): Ying Su and Shi-Zeng LinWe study the superconducting pairing symmetry in twisted bilayer graphene by solving the Bogoliubov-de Gennes equation for all electrons in moiré supercells. With increasing the pairing potential, the system evolves from the mixed nontopological d+id and p+ip phase to the s+p+d phase via the first-o…[Phys. Rev. B 98, 195101] Published Thu Nov 01, 2018

Published in: "Physical Review B".

High-harmonic generation from few-layer hexagonal boron nitride: Evolution from monolayer to bulk response

2018-10-29T16:34:12+00:00October 29th, 2018|Categories: Publications|Tags: |

Author(s): Guillaume Le Breton, Angel Rubio, and Nicolas Tancogne-DejeanTwo-dimensional materials offer a versatile platform to study high-harmonic generation (HHG), encompassing as limiting cases bulklike and atomiclike harmonic generation [Tancogne-Dejean and Rubio, Sci. Adv. 4, eaao5207 (2018)]. Understanding the high-harmonic response of few-layer semiconducting sys…[Phys. Rev. B 98, 165308] Published Mon Oct 29, 2018

Published in: "Physical Review B".

Local versus extended deformed graphene geometries for valley filtering

2018-10-25T16:33:36+00:00October 25th, 2018|Categories: Publications|Tags: |

Author(s): Dawei Zhai and Nancy SandlerThe existence of two inequivalent valleys in the band structure of graphene has motivated the search of mechanisms that allow their separation and control for potential device applications. Among the several schemes proposed in the literature, strain-induced out-of-plane deformations (occurring natu…[Phys. Rev. B 98, 165437] Published Thu Oct 25, 2018

Published in: "Physical Review B".

Enhanced asymmetric valley scattering by scalar fields in nonuniform out-of-plane deformations in graphene

2018-10-25T16:33:26+00:00October 25th, 2018|Categories: Publications|Tags: |

Author(s): Ramon Carrillo-Bastos, Marysol Ochoa, Saúl A. Zavala, and Francisco MirelesWe study the electron scattering produced by local out-of-plane strain deformations in the form of Gaussian bumps in graphene. Of special interest is taking into account the scalar field associated with the redistribution of charge due to deformations on the same footing as the pseudomagnetic field….[Phys. Rev. B 98, 165436] Published Thu Oct 25, 2018

Published in: "Physical Review B".

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