Volume 12 Issue 7, July 2016

Volume 12 Issue 7

Aspects of the disordered Bose–Hubbard model, such as the Bose glass–superfluid transition, are still incompletely understood but this can now be probed in an ultracold atomic gas in an optical lattice using controlled quantum quenches of disorder. Letter p646 IMAGE: USHNISH RAY COVER DESIGN: ALLEN BEATTIE

Editorial

Commentaries

Thesis

Research Highlights

News and Views

  • News & Views |

    The topological degeneracy associated with Majorana edge states has been measured in a spin-1/2 chain of cobalt atoms, thereby opening new avenues in low-dimensional quantum magnetism.

    • Frédéric Mila
  • News & Views |

    A frequency comb technique used in NMR spectroscopy reveals the dynamics of the nuclear spin bath in self-assembled quantum dots.

    • Jeroen Elzerman
    •  & Mark Buitelaar
  • News & Views |

    When it comes to star formation, dwarf galaxies perform very poorly. A possible explanation for this behaviour involves photoelectric electrons heating the star-forming gas.

    • Desika Narayanan
  • News & Views |

    Radiation pressure noise from squeezed light constrains the precision of sensing devices such as improved gravitational wave interferometers.

    • James S. Bennett
    •  & Warwick P. Bowen

Progress Article

Letters

  • Letter |

    Aspects of the disordered Bose–Hubbard model, such as the Bose glass–superfluid transition, are still incompletely understood, but this can now be probed in an ultracold atomic gas in an optical lattice using controlled quantum quenches of disorder.

    • Carolyn Meldgin
    • , Ushnish Ray
    • , Philip Russ
    • , David Chen
    • , David M. Ceperley
    •  & Brian DeMarco
  • Letter |

    The stability of a large class of elemental knots and links to so-called reconnections is studied numerically using the Gross–Pitaevskii model for a superfluid, demonstrating that they universally untie.

    • Dustin Kleckner
    • , Louis H. Kauffman
    •  & William T. M. Irvine
  • Letter |

    Magnetic adatoms offer an appealing platform for building idealized spin models, but achieving sufficient control to do so is challenging. Now, arrays of Co atoms evaporated on a Cu2N/Cu(100) surface are shown to behave like a spin-1/2 XXZ Heisenberg chain.

    • R. Toskovic
    • , R. van den Berg
    • , A. Spinelli
    • , I. S. Eliens
    • , B. van den Toorn
    • , B. Bryant
    • , J.-S. Caux
    •  & A. F. Otte
  • Letter |

    A combination of detailed photoelectron spectroscopy measurements and numerical simulations reveal the presence of so-called Dirac node arcs in the electronic structure of PtSn4.

    • Yun Wu
    • , Lin-Lin Wang
    • , Eundeok Mun
    • , D. D. Johnson
    • , Daixiang Mou
    • , Lunan Huang
    • , Yongbin Lee
    • , S. L. Bud’ko
    • , P. C. Canfield
    •  & Adam Kaminski
  • Letter |

    Coherent valley exciton dynamics are directly probed in a monolayer transition metal dichalcogenide, providing access to the valley coherence time and decoherence mechanisms — crucial for developing methods for manipulating the valley pseudospin.

    • Kai Hao
    • , Galan Moody
    • , Fengcheng Wu
    • , Chandriker Kavir Dass
    • , Lixiang Xu
    • , Chang-Hsiao Chen
    • , Liuyang Sun
    • , Ming-Yang Li
    • , Lain-Jong Li
    • , Allan H. MacDonald
    •  & Xiaoqin Li
  • Letter |

    Using a frequency-comb nuclear magnetic resonance spectroscopy technique it is possible to probe the fluctuations in the nuclear spin bath of a self-assembled quantum dot and reveal long nuclear spin correlation times over one second.

    • A. M. Waeber
    • , M. Hopkinson
    • , I. Farrer
    • , D. A. Ritchie
    • , J. Nilsson
    • , R. M. Stevenson
    • , A. J. Bennett
    • , A. J. Shields
    • , G. Burkard
    • , A. I. Tartakovskii
    • , M. S. Skolnick
    •  & E. A. Chekhovich
  • Letter |

    The magnetic response of nanoparticles made from wide-bandgap oxides that don’t contain any magnetic cations is somewhat of a mystery. Experiments with CeO2 suggest that the origin may be due to vacuum fluctuations.

    • Michael Coey
    • , Karl Ackland
    • , Munuswamy Venkatesan
    •  & Siddhartha Sen

Articles

  • Article |

    Segregation between binding and non-binding proteins in the space between cells is critical for immune response. In vitro experiments show that size alone suffices to explain the exclusion of non-binding proteins from membrane interfaces.

    • Eva M. Schmid
    • , Matthew H. Bakalar
    • , Kaushik Choudhuri
    • , Julian Weichsel
    • , Hyoung Sook Ann
    • , Phillip L. Geissler
    • , Michael L. Dustin
    •  & Daniel A. Fletcher

Measure for Measure

  • Measure for Measure |

    Some concepts are useful but difficult to quantify, as Philip Ball illustrates with the property of hydrophobicity.

    • Philip Ball

Correction

Corrigendum

Erratum