Volume 13 Issue 8, August 2017

Volume 13 Issue 8

The normal state of the ruthenate Sr2RuO4 is not that of a conventional metal but one with enhanced correlation effects, which may help to elucidate the origin of the unconventional superconductivity observed in this material.Article p799 IMAGE: PHILIP DERRY, OXFORD UNIVERSITY COVER DESIGN: BETHANY VUKOMANOVIC

Editorial

  • Editorial |

    The rise of big data represents an opportunity for physicists. To take full advantage, however, they need a subtle but important shift in mindset.

Commentary

  • Commentary |

    Physicists are accustomed to dealing with large datasets, yet they are fortunate in that the quality of their experimental data is very good. The onset of big data has led to an explosion of datasets with a far more complex structure — a development that requires new tools and a different mindset.

    • Jeff Byers

Thesis

Books and Arts

Research Highlights

News and Views

  • News & Views |

    The Einstein–Podolsky–Rosen type of quantum entanglement can be used to improve the sensitivity of laser interferometer gravitational-wave detectors beyond the quantum limit.

    • Raffaele Flaminio
  • News & Views |

    An excitonic Bose–Einstein condensate has so far been realized only in particular semiconductor heterostructure setups. Now, experiments show that such condensates can form in double graphene bilayers separated by hexagonal boron nitride.

    • Koji Muraki
  • News & Views |

    Standard rheology tells us how a cell responds to deformation. But ramping up the frequency reveals more about its internal dynamics and morphology, mapping a route to improved drug treatments — and possible insight into the malignancy of cancers.

    • Klaus Kroy

Letters

  • Letter |

    A detailed experimental investigation on the spin excitations in SrCu2(BO3)2 under an external magnetic confirms the existence of topological triplon modes in this experimental realization of the Shastry–Sutherland model.

    • P. A. McClarty
    • , F. Krüger
    • , T. Guidi
    • , S. F. Parker
    • , K. Refson
    • , A. W. Parker
    • , D. Prabhakaran
    •  & R. Coldea
  • Letter |

    Thermal-expansion measurements of CeCu6−xAux reveal the thermodynamic landscape of this material’s entropy, offering insights into the behaviour of quantum critical fluctuations as the system approaches its quantum critical point.

    • K. Grube
    • , S. Zaum
    • , O. Stockert
    • , Q. Si
    •  & H. v. Löhneysen
  • Letter |

    An electronic double layer, subjected to a high magnetic field, can form an exciton condensate: a Bose–Einstein condensate of Coulomb-bound electron–hole pairs. Now, exciton condensation is reported for a graphene/boron-nitride/graphene structure.

    • Xiaomeng Liu
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Bertrand I. Halperin
    •  & Philip Kim
  • Letter |

    Strongly interacting bosons have been predicted to display a transition into a superfluid ground state, similar to Bose–Einstein condensation. This effect is now observed in a double bilayer graphene structure, with excitons as the bosonic particles.

    • J. I. A. Li
    • , T. Taniguchi
    • , K. Watanabe
    • , J. Hone
    •  & C. R. Dean
  • Letter |

    Van der Waals heterostructures provide a tunable platform for probing the Andreev bound states responsible for proximity-induced superconductivity, helping to establish a connection between Andreev physics at finite energy and the Josephson effect.

    • Landry Bretheau
    • , Joel I-Jan Wang
    • , Riccardo Pisoni
    • , Kenji Watanabe
    • , Takashi Taniguchi
    •  & Pablo Jarillo-Herrero
  • Letter |

    Strong plasmonic hotspots can facilitate ultrafast energy transfer between metallic nanoparticles with almost no energy loss.

    • Eva-Maria Roller
    • , Lucas V. Besteiro
    • , Claudia Pupp
    • , Larousse Khosravi Khorashad
    • , Alexander O. Govorov
    •  & Tim Liedl
  • Letter |

    Attosecond streaking is used to study the dynamics of electron scattering in dielectric nanoparticles in real time. Revealing the mechanisms involved is the first step towards understanding electron scattering in more complex dielectrics.

    • L. Seiffert
    • , Q. Liu
    • , S. Zherebtsov
    • , A. Trabattoni
    • , P. Rupp
    • , M. C. Castrovilli
    • , M. Galli
    • , F. Süßmann
    • , K. Wintersperger
    • , J. Stierle
    • , G. Sansone
    • , L. Poletto
    • , F. Frassetto
    • , I. Halfpap
    • , V. Mondes
    • , C. Graf
    • , E. Rühl
    • , F. Krausz
    • , M. Nisoli
    • , T. Fennel
    • , F. Calegari
    •  & M. F. Kling
  • Letter |

    Microrheology of cells suggests that the dynamics of single filaments in the cytoskeleton dominate at high frequencies. This response can be used to detect differences between cell types and states — including benign and malignant cancer cells.

    • Annafrancesca Rigato
    • , Atsushi Miyagi
    • , Simon Scheuring
    •  & Felix Rico

Articles

  • Article |

    A family of topologically protected Kondo insulators, termed Möbius Kondo insulators, is predicted. A re-analysis of archival resistivity measurements of Ce3Bi4Pt3 and CeNiSn suggests they may be good candidate members of this class.

    • Po-Yao Chang
    • , Onur Erten
    •  & Piers Coleman
  • Article |

    The normal state of the ruthenate Sr2RuO4 is not that of a conventional metal but one with enhanced correlation effects, which may help to elucidate the origin of the unconventional superconductivity observed in this material.

    • Zhenyu Wang
    • , Daniel Walkup
    • , Philip Derry
    • , Thomas Scaffidi
    • , Melinda Rak
    • , Sean Vig
    • , Anshul Kogar
    • , Ilija Zeljkovic
    • , Ali Husain
    • , Luiz H. Santos
    • , Yuxuan Wang
    • , Andrea Damascelli
    • , Yoshiteru Maeno
    • , Peter Abbamonte
    • , Eduardo Fradkin
    •  & Vidya Madhavan
  • Article |

    The electron dynamics of single-layer Bi2Sr2−xLaxCuO6+δ is studied as a function of doping, revealing the evolution of charge-transfer excitations from incoherent and localized (as in a Mott insulator) to coherent and delocalized (as in a conventional metal).

    • S. Peli
    • , S. Dal Conte
    • , R. Comin
    • , N. Nembrini
    • , A. Ronchi
    • , P. Abrami
    • , F. Banfi
    • , G. Ferrini
    • , D. Brida
    • , S. Lupi
    • , M. Fabrizio
    • , A. Damascelli
    • , M. Capone
    • , G. Cerullo
    •  & C. Giannetti
  • Article |

    Nanoscale ferroelectricity is hard to characterize. Studies of BaTiO3 thin films now reveal a close coupling between the ferroelectric and the surface electrochemical states — a notion important for future applications of ferroelectric nanomaterials.

    • Sang Mo Yang
    • , Anna N. Morozovska
    • , Rajeev Kumar
    • , Eugene A. Eliseev
    • , Ye Cao
    • , Lucie Mazet
    • , Nina Balke
    • , Stephen Jesse
    • , Rama K. Vasudevan
    • , Catherine Dubourdieu
    •  & Sergei V. Kalinin

Measure for Measure

  • Measure for Measure |

    Assigning dimensions to physical quantities is not just for practicality. Steven T. Bramwell reflects on the deeper physical connotations of it all.

    • Steven T. Bramwell