Volume 13 Issue 3, March 2017

Volume 13 Issue 3

Cavity spectroscopy measurements elucidate the Fermi polaron nature of the optical excitations in monolayer transition metal dichalcogenides. Letter p255 IMAGE: ATAC IMAMOGLU, ETH ZURICH COVER DESIGN: BETHANY VUKOMANOVIC

Editorial

  • Editorial |

    The 50th anniversary of the Institut Laue–Langevin marks a time for celebration, and for reflection on the future of Europe's neutron-scattering landscape.

Commentary

  • Commentary |

    Introduced originally to mimic the unusual, frustrated behaviour of spin ice pyrochlores, artificial spin ice can be realized in odd, dedicated geometries that open the door to new manifestations of a higher level of frustration.

    • Cristiano Nisoli
    • , Vassilios Kapaklis
    •  & Peter Schiffer

Thesis

Research Highlights

News and Views

  • News & Views |

    Strength lies in numbers and in teamwork: tens of thousands of artificial atoms tightly packed in a nanodiamond act cooperatively, enhancing the optical trapping forces beyond the expected classical bulk polarizability contribution.

    • Clarice D. Aiello
  • News & Views |

    Without a very precise timer one can never catch up with the electron released in photoemission. Attosecond streaking spectroscopy allows such a chronometer clock to be set to zero and reveals the role of electron correlations.

    • Francesca Calegari
  • News & Views |

    A connection between low crystalline symmetry and the allowed symmetries of the current-induced torques generated through the spin–orbit interaction opens up their use in devices with perpendicular magnetic anisotropy.

    • Hidekazu Kurebayashi
  • News & Views |

    Low-mass stars form through a process known as disk accretion, eating up material that orbits in a disk around them. It turns out that the same mechanism also describes the formation of more massive stars.

    • Simone Scaringi

Progress Articles

  • Progress Article |

    Beyond the standard model, the weakly interacting massive particle (WIMP) hypothesis for dark matter is one of the most compelling, and the one being tested at the Large Hadron Collider.

    • Oliver Buchmueller
    • , Caterina Doglioni
    •  & Lian-Tao Wang

    Insight:

Reviews

Letters

  • Letter |

    The strength of optical trapping of a nanodiamond can be increased by cooperative effects between its numerous colour centres — or artificial atoms: an observation that brings together ideas from atom and nanoparticle trapping.

    • Mathieu L. Juan
    • , Carlo Bradac
    • , Benjamin Besga
    • , Mattias Johnsson
    • , Gavin Brennen
    • , Gabriel Molina-Terriza
    •  & Thomas Volz
  • Letter |

    Confinement plays an important role in many-body physics from high energy to condensed matter. New results show that it strongly affects the non-equilibrium dynamics after a quantum quench with possible implications from ultracold atoms to QCD.

    • Marton Kormos
    • , Mario Collura
    • , Gabor Takács
    •  & Pasquale Calabrese
  • Letter |

    Observations of high-harmonic generation from a single layer of a transition metal dichalcogenide opens the door to studying strong-field and attosecond phenomena in two-dimensional materials.

    • Hanzhe Liu
    • , Yilei Li
    • , Yong Sing You
    • , Shambhu Ghimire
    • , Tony F. Heinz
    •  & David A. Reis
  • Letter |

    When deforming snow slowly, it resists. But when applying a deformation rapidly, it gives in more easily. Experiments now reveal propagating deformation bands and the localization of strain in compressed snow — both natural and artificial.

    • Thomas W. Barraclough
    • , Jane R. Blackford
    • , Stefan Liebenstein
    • , Stefan Sandfeld
    • , Tim J. Stratford
    • , Gerhard Weinländer
    •  & Michael Zaiser
  • Letter |

    Observations show that, like light solar-mass stars, heavy stars also form through episodic disk-accretion; but faster, more energetic and emitting more light.

    • A. Caratti o Garatti
    • , B. Stecklum
    • , R. Garcia Lopez
    • , J. Eislöffel
    • , T. P. Ray
    • , A. Sanna
    • , R. Cesaroni
    • , C. M. Walmsley
    • , R. D. Oudmaijer
    • , W. J. de Wit
    • , L. Moscadelli
    • , J. Greiner
    • , A. Krabbe
    • , C. Fischer
    • , R. Klein
    •  & J. M. Ibañez

Articles

  • Article |

    Photoemission is not a simple process and it is not instantaneous. Delays of a few attoseconds have now been measured in helium and it seems that they are partly due to electronic correlations.

    • M. Ossiander
    • , F. Siegrist
    • , V. Shirvanyan
    • , R. Pazourek
    • , A. Sommer
    • , T. Latka
    • , A. Guggenmos
    • , S. Nagele
    • , J. Feist
    • , J. Burgdörfer
    • , R. Kienberger
    •  & M. Schultze
  • Article |

    High-resolution scanning tunnelling microscopy measurements show that chains of magnetic atoms on the surface of a superconductor provide a promising platform for realizing and manipulating Majorana fermion quasiparticles.

    • Benjamin E. Feldman
    • , Mallika T. Randeria
    • , Jian Li
    • , Sangjun Jeon
    • , Yonglong Xie
    • , Zhijun Wang
    • , Ilya K. Drozdov
    • , B. Andrei Bernevig
    •  & Ali Yazdani
  • Article |

    The synchronization of nine nanoconstriction spin Hall nano-oscillators brings spin-based oscillators closer to the power and noise requirements needed for practical applications.

    • A. A. Awad
    • , P. Dürrenfeld
    • , A. Houshang
    • , M. Dvornik
    • , E. Iacocca
    • , R. K. Dumas
    •  & J. Åkerman
  • Article |

    The ability of phototactic microorganisms to move towards optimal light intensities is exploited to generate fluid flows on scales several orders larger than the swimmers themselves. These flows are shown to function as hydrodynamic tweezers.

    • Julien Dervaux
    • , Marina Capellazzi Resta
    •  & Philippe Brunet

Measure for Measure

  • Measure for Measure |

    Narrowing down the value of the Hubble constant has been problematic — probably a manifestation of the dark-energy mystery, writes Barbara Ryden.

    • Barbara Ryden

    Insight: