Physical Review B

/Physical Review B

Time-domain surface plasmon polaritons on a graphene sheet

2018-06-20T20:33:41+00:00 June 20th, 2018|Categories: Publications|Tags: |

Author(s): Paolo Burghignoli, Giampiero Lovat, Rodolfo Araneo, and Salvatore CelozziA time-domain analysis is presented of the transient field excited by a vertical electric dipole on a graphene sheet described through a local scalar conductivity model valid in the intraband regime. The analysis is carried out by means of the double-deformation method of Tsang and Kong [J. Math. Ph…[Phys. Rev. B 97, 245418] Published Wed Jun 20, 2018

Published in: "Physical Review B".

Probing unconventional superconductivity in proximitized graphene by impurity scattering

2018-06-19T16:33:39+00:00 June 19th, 2018|Categories: Publications|Tags: |

Author(s): Oladunjoye A. Awoga and Annica M. Black-SchafferWe demonstrate how potential impurities are a very powerful tool for determining the pairing symmetry in graphene, proximity coupled to a spin-singlet superconductor. All d-wave states are characterized by subgap resonances, with spatial patterns clearly distinguishing between nodal and chiral d-wav…[Phys. Rev. B 97, 214515] Published Tue Jun 19, 2018

Published in: "Physical Review B".

Resonant electron-lattice cooling in graphene

2018-06-19T16:33:28+00:00 June 19th, 2018|Categories: Publications|Tags: , |

Author(s): Jian Feng Kong, Leonid Levitov, Dorri Halbertal, and Eli ZeldovNovel ways to manipulate electron-lattice cooling in solids are of wide interest for both fundamental and applied research. This article describes a mechanism of tunable electron-lattice cooling mediated by defects in a graphene lattice, representing resonant scatterers with energy levels close to the Dirac point. The defects produce a resonant enhancement of cooling, which is analogous to the well-known Purcell effect in optics. Namely, the emission rate of phonons is greatly enhanced when the electronic Fermi energy is tuned to match the defect resonance energy. The ability to control both the cooling rate through electronic gating and the spatial location of cooling through precise defect engineering opens a route to designing cooling pathways in nanodevices.[Phys. Rev. B 97, 245416] Published Tue Jun 19, 2018

Published in: "Physical Review B".

Probing decoupled edge states in a zigzag phosphorene nanoribbon via RKKY exchange interaction

2018-06-18T16:33:24+00:00 June 18th, 2018|Categories: Publications|Tags: , , |

Author(s): SK Firoz Islam, Paramita Dutta, A. M. Jayannavar, and Arijit SahaPhosphorene is an anisotropic puckered two-dimensional hexagonal lattice of phosphorus atoms. The edge modes in a zigzag phosphorene nanoribbon are quasiflat in nature and fully isolated from the bulk states, which are unique in comparison to the other hexagonal lattices like graphene, silicene, etc…[Phys. Rev. B 97, 235424] Published Mon Jun 18, 2018

Published in: "Physical Review B".

Thermal control of graphene morphology: A signature of its intrinsic surface tension

2018-06-18T16:33:21+00:00 June 18th, 2018|Categories: Publications|Tags: |

Author(s): R. Ramírez and C. P. HerreroThe surface tension σ of free-standing graphene is studied by path-integral simulations as a function of the temperature and the in-plane stress. Even if the applied stress vanishes, the membrane displays a finite surface tension σ due to the coupling between the bending oscillations and the real ar…[Phys. Rev. B 97, 235426] Published Mon Jun 18, 2018

Published in: "Physical Review B".

Native point defects and impurities in hexagonal boron nitride

2018-06-18T14:33:55+00:00 June 18th, 2018|Categories: Publications|Tags: |

Author(s): L. Weston, D. Wickramaratne, M. Mackoit, A. Alkauskas, and C. G. Van de WalleHexagonal boron nitride (h-BN) is a technologically important electronic and dielectric material. Recently, research into this material has intensified due to the discovery of bright single-photon-emitting color centers in the form of point defects, with potential applications in advanced quantum technologies. Despite this technological promise, the defect physics of this material is still largely unexplored. Here, the authors have performed detailed first-principles investigations of the defect properties of h-BN, finding that the defect physics of this material is dictated by impurities, in particular carbon, oxygen, and hydrogen. They show how the defect properties of this material can be selectively engineered by growth or processing conditions. These insights will be fundamental to controlled generation of single-photon emitters and for general defect engineering of this material.[Phys. Rev. B 97, 214104] Published Mon Jun 18, 2018

Published in: "Physical Review B".

Proximity-induced topological phases in bilayer graphene

2018-06-14T16:33:27+00:00 June 14th, 2018|Categories: Publications|Tags: , |

Author(s): Abdulrhman M. Alsharari, Mahmoud M. Asmar, and Sergio E. UlloaWe study the band structure of phases induced by depositing bilayer graphene on a transition-metal dichalcogenide monolayer. Tight-binding and low-energy effective Hamiltonian calculations show that it is possible to induce topologically nontrivial phases that should exhibit the quantum spin Hall ef…[Phys. Rev. B 97, 241104(R)] Published Thu Jun 14, 2018

Published in: "Physical Review B".

Spin caloritronics in spin semiconducting armchair graphene nanoribbons

2018-06-13T20:33:33+00:00 June 13th, 2018|Categories: Publications|Tags: |

Author(s): Majid Shirdel-Havar and Rouhollah FarghadanWe designed a spin-caloritronics device based on armchair graphene nanoribbons (AGNRs). We theoretically show that a trapezoidal-shaped graphene flake consisting of four zigzag edges bridged between two AGNRs becomes a spin semiconductor with a tunable spin-dependent transmission gap. The results in…[Phys. Rev. B 97, 235421] Published Wed Jun 13, 2018

Published in: "Physical Review B".

Resonant electron tunneling spectroscopy of antibonding states in a Dirac semimetal

2018-06-12T18:33:56+00:00 June 12th, 2018|Categories: Publications|Tags: |

Author(s): Y. Marques, D. Yudin, I. A. Shelykh, and A. C. SeridonioRecently, it was shown both theoretically and experimentally that certain three-dimensional (3D) materials have Dirac points in the Brillouin zone, thus being 3D analogs of graphene. Moreover, it was suggested that under specific conditions a pair of localized impurities placed inside a three-dimens…[Phys. Rev. B 97, 235121] Published Tue Jun 12, 2018

Published in: "Physical Review B".

Layer-dependent band alignment of few layers of blue phosphorus and their van der Waals heterostructures with graphene

2018-06-12T18:33:54+00:00 June 12th, 2018|Categories: Publications|Tags: , |

Author(s): Renato B. Pontes, Roberto H. Miwa, Antônio J. R. da Silva, Adalberto Fazzio, and José E. PadilhaThe structural and electronic properties of few layers of blue phosphorus and their van der Waals heterostructures with graphene were investigated by means of first-principles electronic structure calculations. We study the four energetically most stable stacking configurations for multilayers of bl…[Phys. Rev. B 97, 235419] Published Tue Jun 12, 2018

Published in: "Physical Review B".

Layer and doping tunable ferromagnetic order in two-dimensional $mathrm{Cr}{mathrm{S}}_{2}$ layers

2018-06-12T16:33:38+00:00 June 12th, 2018|Categories: Publications|

Author(s): Cong Wang, Xieyu Zhou, Yuhao Pan, Jingsi Qiao, Xianghua Kong, Chao-Cheng Kaun, and Wei JiInterlayer coupling is of vital importance for manipulating physical properties, e.g., electronic band gap, in two-dimensional materials. However, tuning magnetic properties in these materials is yet to be addressed. Here, we found the in-plane magnetic orders of CrS2 mono and few layers are tunable…[Phys. Rev. B 97, 245409] Published Tue Jun 12, 2018

Published in: "Physical Review B".

Effective lattice Hamiltonian for monolayer tin disulfide: Tailoring electronic structure with electric and magnetic fields

2018-06-12T16:33:34+00:00 June 12th, 2018|Categories: Publications|Tags: |

Author(s): Jin Yu, Edo van Veen, Mikhail I. Katsnelson, and Shengjun YuanThe electronic properties of monolayer tin dilsulfide (ML−SnS2), a recently synthesized metal dichalcogenide, are studied by a combination of first-principles calculations and tight-binding (TB) approximation. An effective lattice Hamiltonian based on six hybrid sp-like orbitals with trigonal rotati…[Phys. Rev. B 97, 245410] Published Tue Jun 12, 2018

Published in: "Physical Review B".

Dependence of the optical conductivity on the uniaxial and biaxial strains in black phosphorene

2018-06-12T14:33:27+00:00 June 12th, 2018|Categories: Publications|Tags: , |

Author(s): C. H. Yang, J. Y. Zhang, G. X. Wang, and C. ZhangBy using the Kubo formula, the optical conductivity of strained black phosphorene was studied. The anisotropic band dispersion gives rise to an orientation dependent optical conductivity. The energy gap can be tuned by the uniaxial and biaxial strains which can be observed from the interband optical…[Phys. Rev. B 97, 245408] Published Tue Jun 12, 2018

Published in: "Physical Review B".

Microscopic theory of optical absorption in graphene enhanced by lattices of plasmonic nanoparticles

2018-06-11T20:34:01+00:00 June 11th, 2018|Categories: Publications|Tags: |

Author(s): Niclas S. Mueller and Stephanie ReichWe present a microscopic description of plasmon-enhanced optical absorption in graphene, which is based on perturbation theory. We consider the interaction of graphene with a lattice of plasmonic nanoparticles, as was previously realized experimentally. By using tight-binding wave functions for the …[Phys. Rev. B 97, 235417] Published Mon Jun 11, 2018

Published in: "Physical Review B".

Probing nonlocal effects in metals with graphene plasmons

2018-06-11T16:33:34+00:00 June 11th, 2018|Categories: Publications|Tags: , |

Author(s): Eduardo J. C. Dias, David Alcaraz Iranzo, P. A. D. Gonçalves, Yaser Hajati, Yuliy V. Bludov, Antti-Pekka Jauho, N. Asger Mortensen, Frank H. L. Koppens, and N. M. R. PeresIn this paper, we analyze the effects of nonlocality on the optical properties of a system consisting of a thin metallic film separated from a graphene sheet by a hexagonal boron nitride (hBN) layer. We show that nonlocal effects in the metal have a strong impact on the spectrum of the surface plasm…[Phys. Rev. B 97, 245405] Published Mon Jun 11, 2018

Published in: "Physical Review B".

Valley filters, accumulators, and switches induced in graphene quantum dots by lines of adsorbed hydrogen atoms

2018-06-11T16:33:31+00:00 June 11th, 2018|Categories: Publications|Tags: |

Author(s): Mohammadhadi Azari and George KirczenowWe present electronic structure and quantum transport calculations that predict conducting channels induced in graphene quantum dots by lines of adsorbed hydrogen atoms to function as highly efficient, experimentally realizable valley filters, accumulators, and switches. The underlying physics is an…[Phys. Rev. B 97, 245404] Published Mon Jun 11, 2018

Published in: "Physical Review B".

Chemical-potential flow equations for graphene with Coulomb interactions

2018-06-11T16:33:29+00:00 June 11th, 2018|Categories: Publications|Tags: |

Author(s): Christian Fräßdorf and Johannes E. M. MosigWe calculate the chemical potential dependence of the renormalized Fermi velocity and static dielectric function for Dirac quasiparticles in graphene nonperturbatively at finite temperature. By reinterpreting the chemical potential as a flow parameter in the spirit of the functional renormalization …[Phys. Rev. B 97, 235415] Published Mon Jun 11, 2018

Published in: "Physical Review B".

Tunable transmittance in anisotropic two-dimensional materials

2018-06-08T14:33:21+00:00 June 8th, 2018|Categories: Publications|

Author(s): Phusit Nualpijit, Andreas Sinner, and Klaus ZieglerA uniaxial strain applied to graphenelike materials moves the Dirac nodes along the boundary of the Brillouin zone. An extreme case is the merging of the Dirac node positions to a single degenerate spectral node, which gives rise to a new topological phase. Then isotropic Dirac nodes are replaced by…[Phys. Rev. B 97, 235411] Published Fri Jun 08, 2018

Published in: "Physical Review B".

Dielectric properties of graphene/${mathrm{MoS}}_{2}$ heterostructures from <i>ab initio</i> calculations and electron energy-loss experiments

2018-06-07T16:33:23+00:00 June 7th, 2018|Categories: Publications|Tags: , , , |

Author(s): Michael J. Mohn, Ralf Hambach, Philipp Wachsmuth, Christine Giorgetti, and Ute KaiserHigh-energy electronic excitations of graphene and MoS2 heterostructures are investigated by momentum-resolved electron energy-loss spectroscopy in the range of 1 to 35 eV. The interplay of excitations on different sheets is understood in terms of long-range Coulomb interactions and is simulated usi…[Phys. Rev. B 97, 235410] Published Thu Jun 07, 2018

Published in: "Physical Review B".

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