Physical Review Letters

/Physical Review Letters

Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer ${mathrm{VSe}}_{2}$

2018-11-09T16:34:20+00:00November 9th, 2018|Categories: Publications|Tags: |

Author(s): P. Chen, Woei Wu Pai, Y.-H. Chan, V. Madhavan, M. Y. Chou, S.-K. Mo, A.-V. Fedorov, and T.-C. ChiangSingle layers of transition metal dichalcogenides (TMDCs) are excellent candidates for electronic applications beyond the graphene platform; many of them exhibit novel properties including charge density waves (CDWs) and magnetic ordering. CDWs in these single layers are generally a planar projectio…[Phys. Rev. Lett. 121, 196402] Published Fri Nov 09, 2018

Published in: "Physical Review Letters".

Moiré Valleytronics: Realizing Dense Arrays of Topological Helical Channels

2018-11-02T16:34:35+00:00November 2nd, 2018|Categories: Publications|Tags: , |

Author(s): Chen Hu, Vincent Michaud-Rioux, Wang Yao, and Hong GuoWe propose a general and robust platform, the moiré valleytronics, to realize high-density arrays of 1D topological helical channels in real materials at room temperature. We demonstrate the idea using a long-period 1D moiré pattern of graphene on hBN by first-principles calculation. Through calcula…[Phys. Rev. Lett. 121, 186403] Published Fri Nov 02, 2018

Published in: "Physical Review Letters".

Complex Low Energy Tetrahedral Polymorphs of Group IV Elements from First Principles

2018-10-26T16:33:24+00:00October 26th, 2018|Categories: Publications|Tags: , |

Author(s): Chaoyu He, Xizhi Shi, S. J. Clark, Jin Li, Chris J. Pickard, Tao Ouyang, Chunxiao Zhang, Chao Tang, and Jianxin ZhongThe energy landscape of carbon is exceedingly complex, hosting diverse and important metastable phases, including diamond, fullerenes, nanotubes, and graphene. Searching for structures, especially those with large unit cells, in this landscape is challenging. Here we use a combined stochastic search…[Phys. Rev. Lett. 121, 175701] Published Fri Oct 26, 2018

Published in: "Physical Review Letters".

Emergent Dirac Gullies and Gully-Symmetry-Breaking Quantum Hall States in $ABA$ Trilayer Graphene

2018-10-15T16:37:33+00:00October 15th, 2018|Categories: Publications|Tags: |

Author(s): A. A. Zibrov, P. Rao, C. Kometter, E. M. Spanton, J. I. A. Li, Cory R. Dean, T. Taniguchi, K. Watanabe, M. Serbyn, and A. F. YoungResearchers observe new features in the band structure of multilayer graphene that point to enhanced electron interactions.[Phys. Rev. Lett. 121, 167601] Published Mon Oct 15, 2018

Published in: "Physical Review Letters".

Manipulation and Characterization of the Valley-Polarized Topological Kink States in Graphene-Based Interferometers

2018-10-08T20:32:57+00:00October 8th, 2018|Categories: Publications|Tags: |

Author(s): Shu-guang Cheng, Haiwen Liu, Hua Jiang, Qing-Feng Sun, and X. C. XieValley polarized topological kink states, existing broadly in the domain wall of hexagonal lattice systems, are identified in experiments. Unfortunately, only very limited physical properties are given. Using an Aharanov-Bohm interferometer composed of domain walls in graphene systems, we study the …[Phys. Rev. Lett. 121, 156801] Published Mon Oct 08, 2018

Published in: "Physical Review Letters".

Electrically Tunable Gauge Fields in Tiny-Angle Twisted Bilayer Graphene

2018-10-01T16:33:40+00:00October 1st, 2018|Categories: Publications|Tags: |

Author(s): Aline Ramires and Jose L. LadoTwisted bilayer graphene has recently attracted a lot of attention for its rich electronic properties and tunability. Here we show that for very small twist angles, α≪1°, the application of a perpendicular electric field is mathematically equivalent to a new kind of artificial gauge field. This iden…[Phys. Rev. Lett. 121, 146801] Published Mon Oct 01, 2018

Published in: "Physical Review Letters".

Bidirectional Soliton Rain Dynamics Induced by Casimir-Like Interactions in a Graphene Mode-Locked Fiber Laser

2018-09-26T20:33:50+00:00September 26th, 2018|Categories: Publications|Tags: |

Author(s): Kfir Sulimany, Ohad Lib, Gilad Masri, Avi Klein, Moti Fridman, Philippe Grelu, Omri Gat, and Hadar SteinbergWe study experimentally and theoretically the interactions among ultrashort optical pulses in the soliton rain multiple-pulse dynamics of a fiber laser. The laser is mode locked by a graphene saturable absorber fabricated using the mechanical transfer technique. Dissipative optical solitons aggregat…[Phys. Rev. Lett. 121, 133902] Published Wed Sep 26, 2018

Published in: "Physical Review Letters".

Marginally Self-Averaging One-Dimensional Localization in Bilayer Graphene

2018-09-26T16:36:26+00:00September 26th, 2018|Categories: Publications|Tags: |

Author(s): Md. Ali Aamir, Paritosh Karnatak, Aditya Jayaraman, T. Phanindra Sai, T. V. Ramakrishnan, Rajdeep Sensarma, and Arindam GhoshThe combination of a field-tunable band gap, topological edge states, and valleys in the band structure makes insulating bilayer graphene a unique localized system, where the scaling laws of dimensionless conductance g remain largely unexplored. Here we show that the relative fluctuations in lng wit…[Phys. Rev. Lett. 121, 136806] Published Wed Sep 26, 2018

Published in: "Physical Review Letters".

Landau Velocity for Collective Quantum Hall Breakdown in Bilayer Graphene

2018-09-25T14:33:53+00:00September 25th, 2018|Categories: Publications|Tags: , |

Author(s): W. Yang, H. Graef, X. Lu, G. Zhang, T. Taniguchi, K. Watanabe, A. Bachtold, E. H. T. Teo, E. Baudin, E. Bocquillon, G. Fève, J-M. Berroir, D. Carpentier, M. O. Goerbig, and B. PlaçaisBreakdown of the quantum Hall effect (QHE) is commonly associated with an electric field approaching the inter-Landau-level (LL) Zener field, the ratio of the Landau gap and the cyclotron radius. Eluded in semiconducting heterostructures, in spite of extensive investigation, the intrinsic Zener limi…[Phys. Rev. Lett. 121, 136804] Published Tue Sep 25, 2018

Published in: "Physical Review Letters".

Breakdown of the Law of Reflection at a Disordered Graphene Edge

2018-09-25T14:33:52+00:00September 25th, 2018|Categories: Publications|Tags: |

Author(s): E. Walter, T. Ö. Rosdahl, A. R. Akhmerov, and F. HasslerThe law of reflection states that smooth surfaces reflect waves specularly, thereby acting as a mirror. This law is insensitive to disorder as long as its length scale is smaller than the wavelength. Monolayer graphene exhibits a linear dispersion at low energies and consequently a diverging Fermi w…[Phys. Rev. Lett. 121, 136803] Published Tue Sep 25, 2018

Published in: "Physical Review Letters".

Signatures of van Hove Singularities Probed by the Supercurrent in a Graphene-hBN Superlattice

2018-09-25T14:33:45+00:00September 25th, 2018|Categories: Publications|Tags: , |

Author(s): D. I. Indolese, R. Delagrange, P. Makk, J. R. Wallbank, K. Wanatabe, T. Taniguchi, and C. SchönenbergerThe band structure of graphene can be strongly modified if its lattice is aligned with the one of a boron nitride substrate. A moiré superlattice forms, which manifests itself by the appearance of new Dirac points, accompanied by van Hove singularities. In this work, we present supercurrent measurem…[Phys. Rev. Lett. 121, 137701] Published Tue Sep 25, 2018

Published in: "Physical Review Letters".

Transport Spectroscopy of Sublattice-Resolved Resonant Scattering in Hydrogen-Doped Bilayer Graphene

2018-09-24T16:33:59+00:00September 24th, 2018|Categories: Publications|Tags: |

Author(s): Jyoti Katoch, Tiancong Zhu, Denis Kochan, Simranjeet Singh, Jaroslav Fabian, and Roland K. KawakamiWe report the experimental observation of sublattice-resolved resonant scattering in bilayer graphene by performing simultaneous cryogenic atomic hydrogen doping and electron transport measurements in an ultrahigh vacuum. This allows us to monitor the hydrogen adsorption on the different sublattices…[Phys. Rev. Lett. 121, 136801] Published Mon Sep 24, 2018

Published in: "Physical Review Letters".

Quantum Nonlinear Optics in Atomically Thin Materials

2018-09-21T12:34:31+00:00September 21st, 2018|Categories: Publications|

Author(s): Dominik S. Wild, Ephraim Shahmoon, Susanne F. Yelin, and Mikhail D. LukinWe show that a nonlinear optical response associated with a resonant, atomically thin material can be dramatically enhanced by placing it in front of a partially reflecting mirror, rendering otherwise weakly nonlinear systems suitable for experiments and applications involving quantum nonlinear opti…[Phys. Rev. Lett. 121, 123606] Published Fri Sep 21, 2018

Published in: "Physical Review Letters".

Tuning Anti-Klein to Klein Tunneling in Bilayer Graphene

2018-09-21T12:34:22+00:00September 21st, 2018|Categories: Publications|Tags: |

Author(s): Renjun Du (杜人君), Ming-Hao Liu (劉明豪), Jens Mohrmann, Fan Wu (吴凡), Ralph Krupke, Hilbert von Löhneysen, Klaus Richter, and Romain DanneauWe show that in gapped bilayer graphene, quasiparticle tunneling and the corresponding Berry phase can be controlled such that they exhibit features of single-layer graphene such as Klein tunneling. The Berry phase is detected by a high-quality Fabry-Pérot interferometer based on bilayer graphene. B…[Phys. Rev. Lett. 121, 127706] Published Fri Sep 21, 2018

Published in: "Physical Review Letters".

Binary Two-Dimensional Honeycomb Lattice with Strong Spin-Orbit Coupling and Electron-Hole Asymmetry

2018-09-17T18:33:28+00:00September 17th, 2018|Categories: Publications|

Author(s): Jian Gou, Bingyu Xia, Hang Li, Xuguang Wang, Longjuan Kong, Peng Cheng, Hui Li, Weifeng Zhang, Tian Qian, Hong Ding, Yong Xu, Wenhui Duan, Kehui Wu, and Lan ChenTwo-dimensional (2D) materials consisting of heavy atoms with particular arrangements may host exotic quantum properties. Here, we report a unique 2D semiconducting binary compound, a Sn2Bi atomic layer on Si(111), in which hexagons are formed by bonding Bi with a triangular network of Sn. Because o…[Phys. Rev. Lett. 121, 126801] Published Mon Sep 17, 2018

Published in: "Physical Review Letters".

Anomalous Hall Effect in 2D Dirac Materials

2018-09-17T16:33:34+00:00September 17th, 2018|Categories: Publications|Tags: |

Author(s): Manuel Offidani and Aires FerreiraWe present a unified theory of charge carrier transport in 2D Dirac systems with broken mirror inversion and time-reversal symmetries (e.g., as realized in ferromagnetic graphene). We find that the entanglement between spin and pseudospin SU(2) degrees of freedom stemming from spin-orbit effects lea…[Phys. Rev. Lett. 121, 126802] Published Mon Sep 17, 2018

Published in: "Physical Review Letters".

Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a ${mathrm{NbSe}}_{2}$ Superconductor

2018-08-24T16:34:47+00:00August 24th, 2018|Categories: Publications|Tags: |

Author(s): Manas Ranjan Sahu, Xin Liu, Arup Kumar Paul, Sourin Das, Pratap Raychaudhuri, J. K. Jain, and Anindya DasSuperconductivity and the quantum Hall effect are distinct states of matter occurring in apparently incompatible physical conditions. Recent theoretical developments suggest that the coupling of the quantum Hall effect with a superconductor can provide fertile ground for realizing exotic topological…[Phys. Rev. Lett. 121, 086809] Published Fri Aug 24, 2018

Published in: "Physical Review Letters".

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