Physical Review B

/Physical Review B

Nonlocal quantum gain facilitates loss compensation and plasmon amplification in graphene hyperbolic metamaterials

2019-03-22T18:34:25+00:00March 22nd, 2019|Categories: Publications|Tags: |

Author(s): Illya I. Tarasenko, A. Freddie Page, Joachim M. Hamm, and Ortwin HessGraphene-based hyperbolic metamaterials have been predicted to transport evanescent fields with extraordinarily large vacuum wave vectors. It is particularly at much higher wave vector values that the commonly employed descriptional models involving structure homogenization and assumptions of an app…[Phys. Rev. B 99, 115430] Published Fri Mar 22, 2019

Published in: "Physical Review B".

Twists in ferromagnetic monolayers with trigonal prismatic symmetry

2019-03-20T14:35:34+00:00March 20th, 2019|Categories: Publications|Tags: , |

Author(s): Kjetil M. D. Hals and Karin Everschor-SitteTwo-dimensional materials such as graphene or hexagonal boron nitride are indispensable in industry. The recently discovered 2D ferromagnetic materials also promise to be vital for applications. In this work, we develop a phenomenological description of noncentrosymmetric 2D ferromagnets with trigon…[Phys. Rev. B 99, 104422] Published Wed Mar 20, 2019

Published in: "Physical Review B".

Electric-field-induced emergent electrical connectivity in graphene oxide

2019-03-19T12:35:22+00:00March 19th, 2019|Categories: Publications|Tags: , |

Author(s): M. Neek-Amal, R. Rashidi, Rahul R. Nair, D. Neilson, and F. M. PeetersUnderstanding the appearance of local electrical connectivity in liquid filled layered graphene oxide subjected to an external electric field is important to design electrically controlled smart permeable devices and also to gain insight into the physics behind electrical effects on confined water p…[Phys. Rev. B 99, 115425] Published Tue Mar 19, 2019

Published in: "Physical Review B".

Vacancy mediated magnetization and healing of a graphene monolayer

2019-03-18T14:33:34+00:00March 18th, 2019|Categories: Publications|Tags: , |

Author(s): E. Nakhmedov, E. Nadimi, S. Vedaei, O. Alekperov, F. Tatardar, A. I. Najafov, I. I. Abbasov, and A. M. SaletskyVacancy-induced magnetization of a graphene layer is investigated by means of a first-principles DFT method. Calculations of the formation energy and the magnetization by creating the different number of vacancies in a supercell show that a clustering with a big number of vacancies in the cluster is…[Phys. Rev. B 99, 125125] Published Mon Mar 18, 2019

Published in: "Physical Review B".

Orbital limit and Gaussian fluctuation effects in flat-band superconductors with pseudomagnetic fields

2019-03-18T14:33:27+00:00March 18th, 2019|Categories: Publications|Tags: |

Author(s): Xiao-Hui Li and Yao LuIn this work we study a molecular graphene model on the top of a superconductor in the presence of pseudomagnetic fields induced by coplanar strain fields. With the pseudomagnetic fields and the attractive interaction induced from the substrate, a flat-band superconductor can be achieved according t…[Phys. Rev. B 99, 094515] Published Mon Mar 18, 2019

Published in: "Physical Review B".

Unconventional superconductivity in nearly flat bands in twisted bilayer graphene

2019-03-15T14:35:09+00:00March 15th, 2019|Categories: Publications|Tags: , |

Author(s): Bitan Roy and Vladimir JuričićFlat electronic bands can accommodate a plethora of interaction-driven quantum phases, since kinetic energy is quenched therein and electronic interactions therefore prevail. Twisted bilayer graphene, near the so-called “magic angles”, features slow Dirac fermions close to the charge-neutrality poin…[Phys. Rev. B 99, 121407(R)] Published Fri Mar 15, 2019

Published in: "Physical Review B".

Terahertz shifted optical sideband generation in graphene

2019-03-14T16:33:13+00:00March 14th, 2019|Categories: Publications|Tags: |

Author(s): Ashutosh Singh, Saikat Ghosh, and Amit AgarwalExploration of optical nonlinear response of graphene predominantly relies on ultrashort time domain measurements. Here we propose an alternate technique that uses frequency shifted continuous wavefront optical fields, thereby probing graphene’s steady state nonlinear response. We predict frequency …[Phys. Rev. B 99, 125419] Published Thu Mar 14, 2019

Published in: "Physical Review B".

Intricate modulation of interlayer coupling at the graphene oxide/$mathrm{MoS}{mathrm{e}}_{2}$ interface: Application in time-dependent optics and device transport

2019-03-14T14:35:18+00:00March 14th, 2019|Categories: Publications|Tags: , , , |

Author(s): Tuhin Kumar Maji, Kumar Vaibhav, Samir Kumar Pal, Kausik Majumdar, K. V. Adarsh, and Debjani KarmakarIn the GO/MoSe2 semiconductor heterostructure, we have demonstrated a subtle control on the doping dynamics by modulating interlayer coupling through the combination of strain-reducing relative rotation of the constituting layers and variation of ligand type and concentration. By first-principles ca…[Phys. Rev. B 99, 115309] Published Tue Mar 12, 2019

Published in: "Physical Review B".

Weak localization in boron nitride encapsulated bilayer ${mathrm{MoS}}_{2}$

2019-03-14T14:35:13+00:00March 14th, 2019|Categories: Publications|Tags: , |

Author(s): Nikos Papadopoulos, Kenji Watanabe, Takashi Taniguchi, Herre S. J. van der Zant, and Gary A. SteeleWe present measurements of weak localization on hexagonal boron nitride encapsulated bilayer MoS2. From the analysis we obtain information regarding the phase coherence and the spin diffusion of the electrons. We find that the encapsulation with boron nitride provides higher mobilities in the sample…[Phys. Rev. B 99, 115414] Published Mon Mar 11, 2019

Published in: "Physical Review B".

Massless Dirac fermions in III-V semiconductor quantum wells

2019-03-14T14:35:10+00:00March 14th, 2019|Categories: Publications|

Author(s): S. S. Krishtopenko, W. Desrat, K. E. Spirin, C. Consejo, S. Ruffenach, F. Gonzalez-Posada, B. Jouault, W. Knap, K. V. Maremyanin, V. I. Gavrilenko, G. Boissier, J. Torres, M. Zaknoune, E. Tournié, and F. TeppeWe report on the clear evidence of massless Dirac fermions in two-dimensional system based on III-V semiconductors. Using a gated Hall bar made on a three-layer InAs/GaSb/InAs quantum well, we restore the Landau level fan chart by magnetotransport and unequivocally demonstrate a gapless state in our…[Phys. Rev. B 99, 121405(R)] Published Mon Mar 11, 2019

Published in: "Physical Review B".

Control of superconducting pairing symmetries in monolayer black phosphorus

2019-03-14T14:35:00+00:00March 14th, 2019|Categories: Publications|Tags: |

Author(s): Mohammad Alidoust, Morten Willatzen, and Antti-Pekka JauhoMotivated by recent experimental progress, we study the effect of mechanical deformations on the superconducting pairing symmetries in monolayer black phosphorus (MBP). Starting with phonon-mediated intervalley spin-singlet electron-electron pairing and making use of realistic band parameters obtain…[Phys. Rev. B 99, 125417] Published Wed Mar 13, 2019

Published in: "Physical Review B".

Berry phase induced valley level crossing in bilayer graphene quantum dots

2019-03-14T14:34:52+00:00March 14th, 2019|Categories: Publications|Tags: |

Author(s): Zhe Hou, Yan-Feng Zhou, X. C. Xie, and Qing-Feng SunWe study the confined bound states in circular bilayer graphene quantum dots. Using the semiclassical Einstein-Brillouin-Keller quantization rule, we predict that valley levels inside the quantum dot undergo three stages: splitting, crossing, and recombining when varying the applied magnetic field. …[Phys. Rev. B 99, 125422] Published Thu Mar 14, 2019

Published in: "Physical Review B".

Bogolon-mediated electron scattering in graphene in hybrid Bose-Fermi systems

2019-03-14T14:34:47+00:00March 14th, 2019|Categories: Publications|Tags: , |

Author(s): Meng Sun, K. H. A. Villegas, V. M. Kovalev, and I. G. SavenkoWe study electron scattering in graphene in hybrid Bose-Fermi systems. We calculate the energy-dependent electron relaxation time, accounting for the processes of emission and absorption of a Bogoliubov excitation (a bogolon). Then, using the Bloch-Grüneisen approach, we find the finite-temperature …[Phys. Rev. B 99, 115408] Published Fri Mar 08, 2019

Published in: "Physical Review B".

Energetics of the complex phase diagram of a tunable bilayer graphene probed by quantum capacitance

2019-03-14T14:34:38+00:00March 14th, 2019|Categories: Publications|Tags: |

Author(s): Manabendra Kuiri and Anindya DasBilayer graphene provides a unique platform to explore the rich physics in quantum Hall effect. The unusual combination of spin, valley, and orbital degeneracy leads to interesting symmetry-broken states with electric and magnetic field. Conventional transport measurements, like resistance measureme…[Phys. Rev. B 99, 125411] Published Mon Mar 11, 2019

Published in: "Physical Review B".

Hybrid superlattices of graphene and hexagonal boron nitride: A ferromagnetic semiconductor at room temperature

2019-03-14T14:34:31+00:00March 14th, 2019|Categories: Publications|Tags: , |

Author(s): Rita Maji and Joydeep BhattacharjeeCarbon (C) -doped hexagonal boron nitride (hBN) has been experimentally reported to be ferromagnetic at room temperature. Substitution by C in hBN has also been reported to form islands of graphene. In this work, we derive a mechanistic understanding of ferromagnetism with graphene islands in hBN fr…[Phys. Rev. B 99, 125409] Published Fri Mar 08, 2019

Published in: "Physical Review B".

Anderson-Bogoliubov and Carlson-Goldman modes in counterflow superconductors: Case study of a double monolayer graphene

2019-03-14T14:34:26+00:00March 14th, 2019|Categories: Publications|Tags: |

Author(s): K. V. Germash and D. V. FilThe impact of electron-hole pairing on the spectrum of plasma excitations in double layer systems is investigated. The theory is developed with reference to a double monolayer graphene. Taking into account the coupling of scalar potential oscillations with oscillations of the order parameter Δ, we s…[Phys. Rev. B 99, 125412] Published Mon Mar 11, 2019

Published in: "Physical Review B".

Effect of microscopic scattering on the nonlinear transmission of terahertz fields through monolayer graphene

2019-03-14T14:34:23+00:00March 14th, 2019|Categories: Publications|Tags: |

Author(s): L. G. Helt and M. M. DignamWe consider the nonlinear terahertz response of n-doped monolayer graphene at room temperature using a microscopic theory of carrier dynamics. Our tight-binding model treats the carrier-field interaction in the length gauge, includes phonon as well as short-range neutral-impurity scattering, and ful…[Phys. Rev. B 99, 115413] Published Mon Mar 11, 2019

Published in: "Physical Review B".

Quantitative analysis of the electronic decoupling of an organic semiconductor molecule at a metal interface by a monolayer of hexagonal boron nitride

2019-03-14T14:34:21+00:00March 14th, 2019|Categories: Publications|Tags: , |

Author(s): Christine Brülke, Timo Heepenstrick, Ina Krieger, Beatrice Wolff, Xiaosheng Yang, Ali Shamsaddinlou, Simon Weiß, François C. Bocquet, F. Stefan Tautz, Serguei Soubatch, and Moritz SokolowskiThe adsorption geometry, the electronic properties, and the adsorption energy of the prototype organic molecule 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) on a monolayer of hexagonal boron nitride (hBN) grown on the Cu(111) surface were determined experimentally. The perylene core is at a…[Phys. Rev. B 99, 121404(R)] Published Mon Mar 11, 2019

Published in: "Physical Review B".

Straintronics beyond homogeneous deformation

2019-03-06T14:34:36+00:00March 6th, 2019|Categories: Publications|Tags: |

Author(s): R. Gupta, F. Rost, M. Fleischmann, S. Sharma, and S. ShallcrossWe present a continuum theory of graphene, treating on an equal footing both the homogeneous Cauchy-Born (CB) deformation and the microscopic degrees of freedom associated with the two sublattices. While our theory recovers all extant results from homogeneous continuum theory, the Dirac-Weyl equatio…[Phys. Rev. B 99, 125407] Published Wed Mar 06, 2019

Published in: "Physical Review B".

Origin of the $π$-band replicas in the electronic structure of graphene grown on $4H$-SiC(0001)

2019-03-05T16:34:18+00:00March 5th, 2019|Categories: Publications|Tags: |

Author(s): C. M. Polley, L. I. Johansson, H. Fedderwitz, T. Balasubramanian, M. Leandersson, J. Adell, R. Yakimova, and C. JacobiHow many Dirac cones are found in the first Brillouin zone of graphene? According to photoemission studies of graphene grown on 4H-SiC(0001), the answer is not six but dozens. Whether they are real or simply artificial replicas has been a long running argument. While recent studies have argued that at least some replicas are real initial state bands, here the authors show that stronger evidence will be needed to close the case, since almost all of the replicas are consistent with simple photoelectron diffraction.[Phys. Rev. B 99, 115404] Published Tue Mar 05, 2019

Published in: "Physical Review B".

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