Floquet engineering and nonequilibrium topological maps in twisted trilayer graphene

2021-11-26T13:18:12+00:00November 26th, 2021|Categories: Publications|Tags: |

Author(s): I. A. Assi, J. P. F. LeBlanc, Martin Rodriguez-Vega, Hocine Bahlouli, and Michael VoglMotivated by the recent experimental realization of twisted trilayer graphene and the observed superconductivity that is associated with its flat bands at specific angles, we study trilayer graphene under the influence of different forms of light in the noninteracting limit. Specifically, we study f…[Phys. Rev. B 104, 195429] Published Tue Nov 23, 2021

Published in: "Physical Review B".

Higgs-mode signature in ultrafast electron dynamics in superconducting graphene

2021-11-26T13:18:10+00:00November 26th, 2021|Categories: Publications|Tags: |

Author(s): S. Pashalou, H. Goudarzi, M. Khezerlou, and S. A. JafariWe theoretically investigate the effect of superconductivity on the ultrafast electron dynamics in graphene interacting with an ultrashort linearly polarized optical pulse. The optical pulse, with frequency greater than 1 THz, quadratically couples to the Higgs (amplitude) mode and therefore can exc…[Phys. Rev. B 104, 174307] Published Tue Nov 23, 2021

Published in: "Physical Review B".

Nonlinear anomalous Nernst effect in strained graphene induced by trigonal warping

2021-11-26T13:18:08+00:00November 26th, 2021|Categories: Publications|Tags: |

Author(s): Ying-Li Wu, Ge-Hui Zhu, and Xiao-Qin YuIt has recently been reported that a nonlinear anomalous Nernst current (NANC), induced by Berry curvature near the Fermi surface, can be generated as a second-order response to a longitudinal temperature gradient in a wide variety of time-reversal invariant and noncentrosymmetric materials. So far,…[Phys. Rev. B 104, 195427] Published Tue Nov 23, 2021

Published in: "Physical Review B".

Topological Kondo device for distinguishing quasi-Majorana and Majorana signatures

2021-11-26T13:18:06+00:00November 26th, 2021|Categories: Publications|

Author(s): Donghao Liu, Zhan Cao, Xin Liu, Hao Zhang, and Dong E. LiuTo confirm the Majorana signatures, significant effort has been devoted to distinguishing between Majorana zero modes (MZMs) and spatially separated quasi-Majorana modes (QMMs). Because both MZMs and QMMs cause a quantized zero-bias peak in the conductance measurement, their verification task is tho…[Phys. Rev. B 104, 205125] Published Mon Nov 22, 2021

Published in: "Physical Review B".

Atomic arrangements of quasicrystal bilayer graphene: Interlayer distance expansion

2021-11-26T13:18:04+00:00November 26th, 2021|Categories: Publications|Tags: |

Author(s): Yuki Fukaya, Yuhao Zhao, Hyun-Woo Kim, Joung Real Ahn, Hirokazu Fukidome, and Iwao MatsudaBilayer graphene exhibits outstanding characteristics that can be modified by adjusting the twist angle between two layers. An exact 30∘-twisted bilayer graphene forms a material comprising two-dimensional quasicrystals accompanied by a relativistic Dirac fermion. In this study, the atomic arrangeme…[Phys. Rev. B 104, L180202] Published Tue Nov 23, 2021

Published in: "Physical Review B".

Magnetic field behavior in $s+is$ and $s+id$ superconductors: Twisting of applied and spontaneous fields

2021-11-26T13:18:01+00:00November 26th, 2021|Categories: Publications|

Author(s): Martin Speight, Thomas Winyard, Alex Wormald, and Egor BabaevWe consider magnetic field screening and spontaneous magnetic fields in s+is and s+id superconductors both analytically and numerically. We show that in general, the linearized model couples the moduli of order parameters to the magnetic modes. This causes magnetic field screening that does not foll…[Phys. Rev. B 104, 174515] Published Tue Nov 23, 2021

Published in: "Physical Review B".

Antiferromagnetism caused by excess electrons and multiple topological electronic states in the electride ${mathrm{Ba}}_{4}{mathrm{Al}}_{5}·{e}^{−}$

2021-11-26T13:17:59+00:00November 26th, 2021|Categories: Publications|

Author(s): Weizhen Meng, Xiaoming Zhang, Ying Liu, Xuefang Dai, and Guodong LiuElectrides are a hot research topic due to their special electronic distribution. Recently, the coupling effects among electrides, magnetism, and topological electronic states have attracted considerable attention in condensed-matter physics. Here, based on first-principles calculations, we report a…[Phys. Rev. B 104, 195145] Published Tue Nov 23, 2021

Published in: "Physical Review B".

High-order series expansion of non-Hermitian quantum spin models

2021-11-26T13:17:56+00:00November 26th, 2021|Categories: Publications|Tags: |

Author(s): Lea Lenke, Matthias Mühlhauser, and Kai Phillip SchmidtWe investigate the low-energy physics of non-Hermitian quantum spin models with PT symmetry. To this end, we consider the one-dimensional Ising chain and the two-dimensional toric code in a non-Hermitian staggered field. For both systems, dual descriptions in terms of non-Hermitian staggered Ising i…[Phys. Rev. B 104, 195137] Published Fri Nov 19, 2021

Published in: "Physical Review B".

Renormalization group analysis of Dirac fermions with a random mass

2021-11-26T13:17:54+00:00November 26th, 2021|Categories: Publications|

Author(s): Zhiming Pan, Tong Wang, Tomi Ohtsuki, and Ryuichi ShindouTwo-dimensional (2D) disordered superconductor (SC) in class D exhibits a disorder-induced quantum multicritical phenomenon among diffusive thermal metal (DTM), topological superconductor (TS), and conventional localized (AI) phases. To characterize the quantum tricritical point where these three ph…[Phys. Rev. B 104, 174205] Published Thu Nov 18, 2021

Published in: "Physical Review B".

Spin-orbit coupling and interactions in quantum Hall states of graphene/${mathrm{WSe}}_{2}$ heterobilayers

2021-11-26T13:17:49+00:00November 26th, 2021|Categories: Publications|Tags: , |

Author(s): Dongying Wang, Mohammed Karaki, Nicholas Mazzucca, Haidong Tian, Guixin Cao, ChunNing Lau, Yuan-Ming Lu, Marc Bockrath, Kenji Watanabe, and Takashi TaniguchiWe use magnetotransport measurements to probe quantum Hall ground states in graphene/WSe2 heterobilayers. Compared to pristine graphene, inter-Landau level (LL) gaps at half-filled quartets away from filling factor ν=0 show significantly weaker dependence on the magnetic field B, while odd ν filling…[Phys. Rev. B 104, L201301] Published Fri Nov 19, 2021

Published in: "Physical Review B".

Moiré circuits: Engineering magic-angle behavior

2021-11-26T13:17:46+00:00November 26th, 2021|Categories: Publications|Tags: |

Author(s): Weixuan Zhang, Deyuan Zou, Qingsong Pei, Wenjing He, Houjun Sun, and Xiangdong ZhangMoiré superlattices in the twisted bilayer graphene provide an unprecedented platform to investigate a wide range of exotic quantum phenomena. Recently, the twist degree of freedom has been introduced into various classical wave systems, giving rise to new ideas for the wave control. The question is…[Phys. Rev. B 104, L201408] Published Fri Nov 19, 2021

Published in: "Physical Review B".

Magnetotransport study of the mini-Dirac cone in AB-stacked four- to six-layer graphene under perpendicular electric field

2019-12-18T18:34:09+00:00December 18th, 2019|Categories: Publications|Tags: |

Author(s): Kota Horii, Tomoaki Nakasuga, Taiki Hirahara, Shingo Tajima, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi, and Ryuta YagiLandau levels of AB-stacked four- to six-layer graphene were studied experimentally in the presence of a perpendicular electric field. The Landau levels at a low magnetic field showed a characteristic structure that originated from the mini-Dirac cones created by the perpendicular electric fields. S…[Phys. Rev. B 100, 245420] Published Wed Dec 18, 2019

Published in: "Physical Review B".

Dirac fermion quantum Hall antidot in graphene

2019-12-18T18:34:08+00:00December 18th, 2019|Categories: Publications|Tags: |

Author(s): Scott M. Mills, Anna Gura, Kenji Watanabe, Takashi Taniguchi, Matthew Dawber, Dmitri V. Averin, and Xu DuThe ability to localize and manipulate individual quasiparticles in mesoscopic structures is critical in experimental studies of quantum mechanics and thermodynamics, and in potential quantum information devices, e.g., for topological schemes of quantum computation. In strong magnetic field, the qua…[Phys. Rev. B 100, 245130] Published Wed Dec 18, 2019

Published in: "Physical Review B".

Hanbury Brown and Twiss exchange correlations in a graphene box

2019-12-18T18:34:06+00:00December 18th, 2019|Categories: Publications|Tags: |

Author(s): Teemu Elo, Zhenbing Tan, Ciprian Padurariu, Fabian Duerr, Dmitry S. Golubev, Gordey B. Lesovik, and Pertti HakonenQuadratic detection in linear mesoscopic transport systems produces cross terms that can be viewed as interference signals reflecting statistical properties of charge carriers. In electronic systems these cross-term interferences arise from exchange effects due to Pauli principle. Here we demonstrat…[Phys. Rev. B 100, 235433] Published Wed Dec 18, 2019

Published in: "Physical Review B".

Symmetry-breaking and spin-blockage effects on carrier dynamics in single-layer tungsten diselenide

2019-12-17T16:32:16+00:00December 17th, 2019|Categories: Publications|Tags: |

Author(s): Ro-Ya Liu, Meng-Kai Lin, Peng Chen, Takeshi Suzuki, Pip C. J. Clark, Nathan K. Lewis, Cephise Cacho, Emma Springate, Chia-Seng Chang, Kozo Okazaki, Wendy Flavell, Iwao Matsuda, and Tai-Chang ChiangUnderstanding carrier creation and evolution in materials initiated by pulsed optical excitation is central to developing ultrafast optoelectronics. We demonstrate herein that the dynamic response of a system can be drastically modified when its physical dimension is reduced to the atomic scale, the…[Phys. Rev. B 100, 214309] Published Tue Dec 17, 2019

Published in: "Physical Review B".

Photonic emulation of two-dimensional materials with antiferromagnetic order

2019-12-16T18:34:15+00:00December 16th, 2019|Categories: Publications|

Author(s): Ran Gladstein Gladstone, Minwoo Jung, Yuchen Han, and Gennady ShvetsWe introduce an electromagnetic metamaterial—a spin-valley photonic topological insulator (SV-PTI)—that emulates a wide class of theoretically predicted gapped two-dimensional materials with antiferromagnetic order coupled to the valley degree of freedom. First-principles electromagnetic simulations…[Phys. Rev. B 100, 245417] Published Mon Dec 16, 2019

Published in: "Physical Review B".

Reentrant pinning of a $^{3}mathrm{He}$ overlayer in a $^{3}mathrm{He}text{−}^{4}mathrm{He}$ mixture film

2019-12-16T18:34:08+00:00December 16th, 2019|Categories: Publications|

Author(s): Ko Okamura, Junko Taniguchi, Mitsunori Hieda, and Masaru SuzukiWe performed quartz crystal microbalance experiments for a He3−He4 mixture film on an exfoliated single-crystalline graphite using a 32-kHz quartz tuning fork. The decoupled He3 overlayer on the superfluid He4 layer shows a reentrant pinning at a certain temperature T3d under a large oscillation amp…[Phys. Rev. B 100, 214508] Published Mon Dec 16, 2019

Published in: "Physical Review B".

Attractive electron-electron interactions from internal screening in magic-angle twisted bilayer graphene

2019-12-12T16:32:40+00:00December 12th, 2019|Categories: Publications|Tags: |

Author(s): Zachary A. H. Goodwin, Fabiano Corsetti, Arash A. Mostofi, and Johannes LischnerTwisted bilayer graphene (tBLG) has recently emerged as a new platform for studying electron correlations, the strength of which can be controlled via the twist angle. Here, we study the effect of internal screening on electron-electron interactions in undoped tBLG. Using the random-phase approximat…[Phys. Rev. B 100, 235424] Published Thu Dec 12, 2019

Published in: "Physical Review B".

Plasmon oscillations in two-dimensional arrays of ultranarrow graphene nanoribbons

2019-12-12T16:32:38+00:00December 12th, 2019|Categories: Publications|Tags: |

Author(s): A. Sindona, M. Pisarra, S. Bellucci, T. Tene, M. Guevara, and C. Vacacela GomezThe recent ability to manipulate graphene-like structures at the atomic scale is opening up new challenges in electronics and photonics, with a key focus on the bulk and edges of the systems, which generate peculiar and interfering charge density oscillations, quantized as plasmons. These quasiparti…[Phys. Rev. B 100, 235422] Published Thu Dec 12, 2019

Published in: "Physical Review B".

Honeycomb silicon on alumina: Massless Dirac fermions in silicene on substrate

2019-12-12T16:32:35+00:00December 12th, 2019|Categories: Publications|Tags: |

Author(s): Paola Gori, Ihor Kupchak, Friedhelm Bechstedt, Davide Grassano, and Olivia PulciWe predict the stability of a graphenelike silicene sheet on one monolayer of aluminum oxide. We find that the honeycomb buckled structure of silicene is not broken upon interaction with one monolayer of Al2O3 in the kagome geometry. As a consequence, the electronic band structure shows unperturbed …[Phys. Rev. B 100, 245413] Published Thu Dec 12, 2019

Published in: "Physical Review B".

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