Volume 15 Issue 11, November 2019

Volume 15 Issue 11

Odd viscosity

A chiral fluid comprising spinning colloidal magnets exhibits macroscopic dynamics reminiscent of the free surface flows of Newtonian fluids, together with unique features suggestive of Hall—or odd—viscosity.

See Irvine et al.

Image: Vishal Soni, Ephraim Bililign, Sofia Magkiriadou, University of Chicago. Cover Design: David Shand

Editorial

  • Editorial |

    Half of the 2019 Nobel Prize in Physics was awarded to James Peebles “for theoretical discoveries in physical cosmology” and the other half is shared by Michel Mayor and Didier Queloz “for the discovery of an exoplanet orbiting a solar-type star”.

  • Editorial |

    The demonstration of a quantum computational advantage is a milestone worth celebrating.

Thesis

Research Highlights

News & Views

  • News & Views |

    Two independent cold-atom experiments have demonstrated the building blocks for the quantum simulation of dynamical gauge fields — an advance that holds promise for our understanding of computationally intractable problems in high-energy physics.

    • Cheng Chin
  • News & Views |

    Spatially resolved measurements of twisted bilayer graphene reveal more details of the strongly correlated electrons.

    • Adina Luican-Mayer
  • News & Views |

    The demonstration of high-resolution spectroscopy of Sr2 molecules trapped in an optical lattice at the ‘magic’ wavelength opens the way to precision control of molecular excitations.

    • Nicola Poli
  • News & Views |

    A model fluid comprising rotating magnetic particles behaves according to the equations of hydrodynamics, but for a few key differences due to broken mirror symmetry. The resulting active chiral fluid is characterized by parity-odd Hall viscosity.

    • Alexander Abanov
  • News & Views |

    A statistical analysis of data from ultra-relativistic heavy-ion collisions has uncovered the specific viscosities of the quark–gluon plasma — suggesting that the hottest matter in the current Universe behaves like a near-perfect fluid.

    • Kari J. Eskola

Letters

  • Letter |

    The realization of a molecular lattice clock based on vibrations in diatomic molecules is reported with coherence times lasting over tens of milliseconds, which is enabled by the use of a state-insensitive magic lattice trap.

    • S. S. Kondov
    • , C.-H. Lee
    • , K. H. Leung
    • , C. Liedl
    • , I. Majewska
    • , R. Moszynski
    •  & T. Zelevinsky
  • Letter |

    By coupling a superconducting qubit to surface acoustic waves the ‘giant atom’ regime is realized, where an atom is coupled to a field with wavelength orders of magnitude smaller than the atomic size. This leads to non-Markovian qubit dynamics.

    • Gustav Andersson
    • , Baladitya Suri
    • , Lingzhen Guo
    • , Thomas Aref
    •  & Per Delsing
  • Letter |

    Stacked 2D materials can host excitons with distinct valley selection rules due to the spatial variation of the moiré pattern. The authors demonstrate this via optical spectroscopy, opening a route for control of optoelectronic devices.

    • Chenhao Jin
    • , Emma C. Regan
    • , Danqing Wang
    • , M. Iqbal Bakti Utama
    • , Chan-Shan Yang
    • , Jeffrey Cain
    • , Ying Qin
    • , Yuxia Shen
    • , Zhiren Zheng
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Sefaattin Tongay
    • , Alex Zettl
    •  & Feng Wang
  • Letter |

    Experiments with attosecond time resolution reveal many-body electron dynamics in transition metals before thermalization sets in. Ultrafast electronic localization on d orbitals is found to dominate the collective dynamic response of the system.

    • M. Volkov
    • , S. A. Sato
    • , F. Schlaepfer
    • , L. Kasmi
    • , N. Hartmann
    • , M. Lucchini
    • , L. Gallmann
    • , A. Rubio
    •  & U. Keller
  • Letter |

    Photonic Weyl points—topologically chiral singularity points in three-dimensional momentum space—have been realized in a homogeneous non-reciprocal material without a crystal lattice structure.

    • Dongyang Wang
    • , Biao Yang
    • , Wenlong Gao
    • , Hongwei Jia
    • , Quanlong Yang
    • , Xieyu Chen
    • , Minggui Wei
    • , Changxu Liu
    • , Miguel Navarro-Cía
    • , Jiaguang Han
    • , Weili Zhang
    •  & Shuang Zhang
  • Letter |

    Electron bunches are generated and accelerated to relativistic velocities by tunnel ionization of neutral gas species in a plasma. This represents a step towards ultra-bright, high-emittance beams in plasma wakefield accelerators. [This summary has been amended from ‘laser-plasma’ to ‘plasma wakefield’ accelerators.]

    • A. Deng
    • , O. S. Karger
    • , T. Heinemann
    • , A. Knetsch
    • , P. Scherkl
    • , G. G. Manahan
    • , A. Beaton
    • , D. Ullmann
    • , G. Wittig
    • , A. F. Habib
    • , Y. Xi
    • , M. D. Litos
    • , B. D. O’Shea
    • , S. Gessner
    • , C. I. Clarke
    • , S. Z. Green
    • , C. A. Lindstrøm
    • , E. Adli
    • , R. Zgadzaj
    • , M. C. Downer
    • , G. Andonian
    • , A. Murokh
    • , D. L. Bruhwiler
    • , J. R. Cary
    • , M. J. Hogan
    • , V. Yakimenko
    • , J. B. Rosenzweig
    •  & B. Hidding

Articles

  • Article |

    An effective Hamiltonian exhibiting $${\Bbb Z}_2$$ Z 2 symmetry has been engineered by implementing a Floquet-based method on ultracold bosons in an optical lattice, providing a first step towards quantum simulation of $${\Bbb Z}_2$$ Z 2 lattice gauge theories with ultracold matter.

    • Christian Schweizer
    • , Fabian Grusdt
    • , Moritz Berngruber
    • , Luca Barbiero
    • , Eugene Demler
    • , Nathan Goldman
    • , Immanuel Bloch
    •  & Monika Aidelsburger
  • Article |

    Scanning tunnelling microscopy shows that electrons in twisted bilayer graphene are strongly correlated for a wide range of density. In particular, a correlated regime appears near charge neutrality and theory suggests nematic ordering.

    • Youngjoon Choi
    • , Jeannette Kemmer
    • , Yang Peng
    • , Alex Thomson
    • , Harpreet Arora
    • , Robert Polski
    • , Yiran Zhang
    • , Hechen Ren
    • , Jason Alicea
    • , Gil Refael
    • , Felix von Oppen
    • , Kenji Watanabe
    • , Takashi Taniguchi
    •  & Stevan Nadj-Perge
  • Article |

    The authors use STM to show that there are two different classes of zero-bias peak in vortex cores of Fe(Te,Se). One class is topological, one not. These are distinguished by a shift in the energy levels of the excited states.

    • Lingyuan Kong
    • , Shiyu Zhu
    • , Michał Papaj
    • , Hui Chen
    • , Lu Cao
    • , Hiroki Isobe
    • , Yuqing Xing
    • , Wenyao Liu
    • , Dongfei Wang
    • , Peng Fan
    • , Yujie Sun
    • , Shixuan Du
    • , John Schneeloch
    • , Ruidan Zhong
    • , Genda Gu
    • , Liang Fu
    • , Hong-Jun Gao
    •  & Hong Ding
  • Article |

    A chiral fluid comprising spinning colloidal magnets exhibits macroscopic dynamics reminiscent of the free surface flows of Newtonian fluids, together with unique features suggestive of Hall—or odd—viscosity.

    • Vishal Soni
    • , Ephraim S. Bililign
    • , Sofia Magkiriadou
    • , Stefano Sacanna
    • , Denis Bartolo
    • , Michael J. Shelley
    •  & William T. M. Irvine
  • Article |

    An observation that cells at the edge of a healing wound readily undergo intercalation leads to the finding that tissue fluidity is crucial for effective wound closure.

    • Robert J. Tetley
    • , Michael F. Staddon
    • , Davide Heller
    • , Andreas Hoppe
    • , Shiladitya Banerjee
    •  & Yanlan Mao

Amendments & Corrections

Measure for Measure