Volume 14 Issue 9, September 2018

Volume 14 Issue 9

Bismuth on higher ground

The study of the band structure and crystal symmetry of semimetal bismuth indicates that this material is a kind of higher-order topological insulator hosting robust one-dimensional metallic states on the hinges of the crystal.

See Neupert et al. and Ast.

Image: Yazdani Lab, Princeton University. Cover Design: David Shand.

Editorial

  • Editorial |

    Topology is everywhere. Recent predictions for and realizations of higher-order topological insulators are a case in point.

  • Editorial |

    In praise of the Fields Medal.

Correspondence

Thesis

Research Highlights

News & Views

  • News & Views |

    Cooling molecules down to their ground state is an ongoing challenge for atomic and molecular physicists. Further steps in this journey have recently been made, with promising implications.

    • Paul S. Julienne
  • News & Views |

    The properties of bismuth have long defied expectation, casting it just outside the bounds of almost every category. Now topology joins the list, as its electronic structure once deemed trivial turns out to have higher-order topology.

    • Christian R. Ast
  • News & Views |

    The realization of a new topological state using an electrical-circuit approach establishes a flexible scheme that should enable further explorations into uncharted territory and, equally importantly, make experiments with topological states more broadly accessible.

    • Ling Lu
  • News & Views |

    Applications of spintronics often require angular momentum to be moved from place to place. A possible observation of spin superfluidity may point the way toward the transport of spin angular momentum across an insulating sample with no dissipation or energy loss.

    • Joshua Folk
  • News & Views |

    Understanding how natural surfaces repel foulants by wrinkling seems like a simple matter of elasticity. But the nonlinear behaviours that emerge from dimensional effects make for some intriguing new physics.

    • Haim Diamant
  • News & Views |

    Recent experiments demonstrate that effects arising from quantum geometrical phases and band structure topology can coexist in two-dimensional materials, and can be addressed via optoelectronic experiments.

    • Alexander W. Holleitner
    •  & Paul B. Seifert

Letters

  • Letter |

    Magnetically tunable scattering resonances between strontium and rubidium atoms are observed in an ultracold experiment, opening the door to exploring quantum many-body physics with new designed molecules.

    • Vincent Barbé
    • , Alessio Ciamei
    • , Benjamin Pasquiou
    • , Lukas Reichsöllner
    • , Florian Schreck
    • , Piotr S. Żuchowski
    •  & Jeremy M. Hutson
  • Letter |

    By coupling photons in two distinguishable modes to separate transitions of a single atom, strong correlations between photons are created. The technique makes all-optical switching and sensing possible at the single-photon level.

    • Christoph Hamsen
    • , Karl Nicolas Tolazzi
    • , Tatjana Wilk
    •  & Gerhard Rempe
  • Letter |

    Laser cooling of optically trapped diatomic molecules CaF to sub-Doppler temperatures has been achieved. The technique provides an alternative approach towards the production of ultracold polar molecules.

    • Loïc Anderegg
    • , Benjamin L. Augenbraun
    • , Yicheng Bao
    • , Sean Burchesky
    • , Lawrence W. Cheuk
    • , Wolfgang Ketterle
    •  & John M. Doyle
  • Letter |

    Calculating the amount of radiation that can ultimately be extracted from free electrons near an arbitrary material structure is a challenge. Now, an upper limit to the spontaneous photon emission of electrons is demonstrated, regardless of geometry.

    • Yi Yang
    • , Aviram Massuda
    • , Charles Roques-Carmes
    • , Steven E. Kooi
    • , Thomas Christensen
    • , Steven G. Johnson
    • , John D. Joannopoulos
    • , Owen D. Miller
    • , Ido Kaminer
    •  & Marin Soljačić
  • Letter |

    Optoelectronic experiments show that a monolayer of WTe2 is a material that simultaneously has topological electronic states and electron wavefunctions with a dipole in their Berry curvature.

    • Su-Yang Xu
    • , Qiong Ma
    • , Huitao Shen
    • , Valla Fatemi
    • , Sanfeng Wu
    • , Tay-Rong Chang
    • , Guoqing Chang
    • , Andrés M. Mier Valdivia
    • , Ching-Kit Chan
    • , Quinn D. Gibson
    • , Jiadong Zhou
    • , Zheng Liu
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Hsin Lin
    • , Robert J. Cava
    • , Liang Fu
    • , Nuh Gedik
    •  & Pablo Jarillo-Herrero
  • Letter |

    Spins are transmitted over a distance of 5 μm through a piece of antiferromagnetic graphene. This shows that graphene can be a platform to explore the fundamental physics of spin transport in antiferromagnets for application in spintronics.

    • Petr Stepanov
    • , Shi Che
    • , Dmitry Shcherbakov
    • , Jiawei Yang
    • , Ruoyu Chen
    • , Kevin Thilahar
    • , Greyson Voigt
    • , Marc W. Bockrath
    • , Dmitry Smirnov
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Roger K. Lake
    • , Yafis Barlas
    • , Allan H. MacDonald
    •  & Chun Ning Lau
  • Letter |

    Transport measurements performed on MoGe superconducting nanowires reveal a quantitative agreement with quantum critical behaviour driven by a pair-breaking mechanism.

    • Hyunjeong Kim
    • , Frédéric Gay
    • , Adrian Del Maestro
    • , Benjamin Sacépé
    •  & Andrey Rogachev

Articles

  • Article |

    The study of the band structure and crystal symmetry of the semimetal bismuth indicates that this material is a higher-order topological insulator hosting robust one-dimensional metallic states on the hinges of the crystal.

    • Frank Schindler
    • , Zhijun Wang
    • , Maia G. Vergniory
    • , Ashley M. Cook
    • , Anil Murani
    • , Shamashis Sengupta
    • , Alik Yu. Kasumov
    • , Richard Deblock
    • , Sangjun Jeon
    • , Ilya Drozdov
    • , Hélène Bouchiat
    • , Sophie Guéron
    • , Ali Yazdani
    • , B. Andrei Bernevig
    •  & Titus Neupert
  • Article |

    The realization of a two-dimensional quadrupole topological insulator—featuring gapless corner states but an otherwise insulating bulk and edge—establishes electrical circuits as a versatile platform for implementing topological band structures.

    • Stefan Imhof
    • , Christian Berger
    • , Florian Bayer
    • , Johannes Brehm
    • , Laurens W. Molenkamp
    • , Tobias Kiessling
    • , Frank Schindler
    • , Ching Hua Lee
    • , Martin Greiter
    • , Titus Neupert
    •  & Ronny Thomale
  • Article |

    A new type of skyrmion is identified in the chiral magnetic material Cu2OSeO3 at low temperature. This is the first time that a single material has been shown to exhibit more than one distinct skyrmion phase.

    • A. Chacon
    • , L. Heinen
    • , M. Halder
    • , A. Bauer
    • , W. Simeth
    • , S. Mühlbauer
    • , H. Berger
    • , M. Garst
    • , A. Rosch
    •  & C. Pfleiderer
  • Article |

    Perfect transmission of sound waves through a strongly disordered environment is demonstrated using a set of speakers that provide exactly the right input to counteract scattering by the disorder. These principles can also be applied to light.

    • Etienne Rivet
    • , Andre Brandstötter
    • , Konstantinos G. Makris
    • , Hervé Lissek
    • , Stefan Rotter
    •  & Romain Fleury
  • Article |

    Natural surfaces better their synthetic counterparts at coping with biofouling. A characterization of topography-induced delamination reveals a mechanism whereby elastic energy drives the crack propagation that facilitates surface renewal.

    • Luka Pocivavsek
    • , Joseph Pugar
    • , Robert O’Dea
    • , Sang-Ho Ye
    • , William Wagner
    • , Edith Tzeng
    • , Sachin Velankar
    •  & Enrique Cerda
  • Article |

    Biofilms of rod-shaped bacteria can grow from a two-dimensional layer of founder cells into a three-dimensional structure with a vertically aligned core. Here, the physics underlying this transition is traced down to the properties of individual cells.

    • Farzan Beroz
    • , Jing Yan
    • , Yigal Meir
    • , Benedikt Sabass
    • , Howard A. Stone
    • , Bonnie L. Bassler
    •  & Ned S. Wingreen
  • Article |

    A violation of Lorentz symmetry would represent a fundamental departure from the physics of the standard model. Searching for anomalous neutrino oscillations, the IceCube collaboration reports no violation, and puts stringent bounds on its existence.

    • M. G. Aartsen
    • , G. C. Hill
    • , A. Kyriacou
    • , S. Robertson
    • , A. Wallace
    • , B. J. Whelan
    • , M. Ackermann
    • , E. Bernardini
    • , S. Blot
    • , F. Bradascio
    • , H.-P. Bretz
    • , J. Brostean-Kaiser
    • , A. Franckowiak
    • , E. Jacobi
    • , T. Karg
    • , T. Kintscher
    • , S. Kunwar
    • , R. Nahnhauer
    • , K. Satalecka
    • , C. Spiering
    • , J. Stachurska
    • , A. Stasik
    • , N. L. Strotjohann
    • , A. Terliuk
    • , M. Usner
    • , J. van Santen
    • , J. Adams
    • , H. Bagherpour
    • , J. A. Aguilar
    • , I. Ansseau
    • , D. Heereman
    • , K. Meagher
    • , T. Meures
    • , A. O’Murchadha
    • , E. Pinat
    • , C. Raab
    • , M. Ahlers
    • , E. Bourbeau
    • , D. J. Koskinen
    • , M. J. Larson
    • , M. Medici
    • , M. Rameez
    • , T. Stuttard
    • , M. Ahrens
    • , C. Bohm
    • , J. P. Dumm
    • , C. Finley
    • , S. Flis
    • , K. Hultqvist
    • , C. Walck
    • , M. Zoll
    • , I. Al Samarai
    • , S. Bron
    • , T. Carver
    • , A. Christov
    • , T. Montaruli
    • , D. Altmann
    • , G. Anton
    • , T. Glüsenkamp
    • , U. Katz
    • , T. Kittler
    • , M. Tselengidou
    • , K. Andeen
    • , M. Plum
    • , T. Anderson
    • , J. J. DeLaunay
    • , M. Dunkman
    • , P. Eller
    • , F. Huang
    • , A. Keivani
    • , J. L. Lanfranchi
    • , D. V. Pankova
    • , G. Tešić
    • , C. F. Turley
    • , M. J. Weiss
    • , C. Argüelles
    • , S. Axani
    • , G. H. Collin
    • , J. M. Conrad
    • , M. Moulai
    • , J. Auffenberg
    • , M. Brenzke
    • , T. Glauch
    • , C. Haack
    • , P. Kalaczynski
    • , J. P. Koschinsky
    • , M. Leuermann
    • , L. Rädel
    • , R. Reimann
    • , M. Rongen
    • , T. Sälzer
    • , S. Schoenen
    • , L. Schumacher
    • , J. Stettner
    • , M. Vehring
    • , E. Vogel
    • , M. Wallraff
    • , A. Waza
    • , C. H. Wiebusch
    • , X. Bai
    • , E. Dvorak
    • , J. P. Barron
    • , W. Giang
    • , D. Grant
    • , C. Kopper
    • , R. W. Moore
    • , S. C. Nowicki
    • , S. E. Sanchez Herrera
    • , S. Sarkar
    • , F. D. Wandler
    • , C. Weaver
    • , T. R. Wood
    • , E. Woolsey
    • , J. P. Yanez
    • , S. W. Barwick
    • , G. Yodh
    • , V. Baum
    • , S. Böser
    • , V. di Lorenzo
    • , B. Eberhardt
    • , T. Ehrhardt
    • , L. Köpke
    • , G. Krückl
    • , G. Momenté
    • , P. Peiffer
    • , J. Sandroos
    • , A. Steuer
    • , K. Wiebe
    • , R. Bay
    • , K. Filimonov
    • , P. B. Price
    • , K. Woschnagg
    • , J. J. Beatty
    • , J. Becker Tjus
    • , F. Bos
    • , B. Eichmann
    • , M. Kroll
    • , S. Schöneberg
    • , F. Tenholt
    • , K.-H. Becker
    • , D. Bindig
    • , K. Helbing
    • , S. Hickford
    • , R. Hoffmann
    • , F. Lauber
    • , U. Naumann
    • , A. Obertacke Pollmann
    • , D. Soldin
    • , S. BenZvi
    • , R. Cross
    • , D. Berley
    • , E. Blaufuss
    • , E. Cheung
    • , J. Felde
    • , E. Friedman
    • , R. Hellauer
    • , K. D. Hoffman
    • , R. Maunu
    • , A. Olivas
    • , T. Schmidt
    • , M. Song
    • , G. W. Sullivan
    • , D. Z. Besson
    • , G. Binder
    • , S. R. Klein
    • , S. Miarecki
    • , T. Palczewski
    • , J. Tatar
    • , M. Börner
    • , T. Fuchs
    • , M. Hünnefeld
    • , M. Meier
    • , T. Menne
    • , D. Pieloth
    • , W. Rhode
    • , T. Ruhe
    • , A. Sandrock
    • , P. Schlunder
    • , J. Soedingrekso
    • , J. Werthebach
    • , D. Bose
    • , H. Dujmovic
    • , S. In
    • , M. Jeong
    • , W. Kang
    • , J. Kim
    • , C. Rott
    • , O. Botner
    • , A. Burgman
    • , A. Hallgren
    • , C. Pérez de los Heros
    • , E. Unger
    • , J. Bourbeau
    • , J. Braun
    • , J. Casey
    • , D. Chirkin
    • , M. Day
    • , P. Desiati
    • , J. C. Díaz-Vélez
    • , S. Fahey
    • , K. Ghorbani
    • , Z. Griffith
    • , F. Halzen
    • , K. Hanson
    • , B. Hokanson-Fasig
    • , K. Jero
    • , A. Karle
    • , M. Kauer
    • , J. L. Kelley
    • , A. Kheirandish
    • , Q. R. Liu
    • , W. Luszczak
    • , S. Mancina
    • , F. McNally
    • , G. Merino
    • , A. Schneider
    • , M. N. Tobin
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    • , B. Ty
    • , J. Vandenbroucke
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    • , L. Wille
    • , M. Wolf
    • , J. Wood
    • , D. L. Xu
    • , T. Yuan
    • , L. Brayeur
    • , M. Casier
    • , C. De Clercq
    • , K. D. de Vries
    • , G. de Wasseige
    • , J. Kunnen
    • , J. Lünemann
    • , G. Maggi
    • , S. Toscano
    • , N. van Eijndhoven
    • , K. Clark
    • , L. Classen
    • , A. Kappes
    • , S. Coenders
    • , M. Huber
    • , K. Krings
    • , I. C. Rea
    • , E. Resconi
    • , A. Turcati
    • , D. F. Cowen
    • , J. P. A. M. de André
    • , T. DeYoung
    • , J. Hignight
    • , K. B. M. Mahn
    • , J. Micallef
    • , G. Neer
    • , D. Rysewyk
    • , H. Dembinski
    • , P. A. Evenson
    • , T. K. Gaisser
    • , J. G. Gonzalez
    • , R. Koirala
    • , H. Pandya
    • , D. Seckel
    • , T. Stanev
    • , S. Tilav
    • , S. De Ridder
    • , M. Labare
    • , D. Ryckbosch
    • , W. Van Driessche
    • , S. Vanheule
    • , M. Vraeghe
    • , M. de With
    • , D. Hebecker
    • , H. Kolanoski
    • , A. R. Fazely
    • , S. Ter-Antonyan
    • , X. W. Xu
    • , J. Gallagher
    • , L. Gerhardt
    • , A. Goldschmidt
    • , D. R. Nygren
    • , G. T. Przybylski
    • , T. Stezelberger
    • , R. G. Stokstad
    • , K. Hoshina
    • , A. Ishihara
    • , M. Kim
    • , T. Kuwabara
    • , L. Lu
    • , K. Mase
    • , M. Relich
    • , A. Stößl
    • , S. Yoshida
    • , G. S. Japaridze
    • , B. J. P. Jones
    • , T. Katori
    • , S. Mandalia
    • , J. Kiryluk
    • , M. Lesiak-Bzdak
    • , H. Niederhausen
    • , Y. Xu
    • , G. Kohnen
    • , S. Kopper
    • , P. Nakarmi
    • , J. A. Pepper
    • , M. Santander
    • , P. A. Toale
    • , D. R. Williams
    • , M. Kowalski
    • , N. Kurahashi
    • , B. Relethford
    • , M. Richman
    • , L. Wills
    • , J. Madsen
    • , S. Seunarine
    • , G. M. Spiczak
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    • , K. Rawlins
    • , S. Sarkar
    • , M. Stamatikos
    • , M. Sutherland
    • , I. Taboada
    •  & C. F. Tung

Amendments & Corrections

Measure for Measure

  • Measure for Measure |

    Solid angle is an ancient notion with modern relevance. A one-page primer by Ben Kravitz.

    • Ben Kravitz