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Dicke time crystals in driven-dissipative quantum many-body systems

New Journal of Physics, ISSN: 1367-2630, Vol: 21, Issue: 7
2019
  • 108
    Citations
  • 0
    Usage
  • 70
    Captures
  • 1
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    108
    • Citation Indexes
      108
  • Captures
    70
  • Mentions
    1
    • News Mentions
      1
      • 1

Most Recent News

Viewpoint: Time Crystals in Open Systems

Author(s): Zongping Gong and Masahito Ueda Experiments successfully capture signatures of a discrete time crystal phase in an open, quantum many-body system. [Physics 14, 104] Published Mon Jul 19, 2021

Article Description

The Dicke model-a paradigmatic example of superradiance in quantum optics-describes an ensemble of atoms which are collectively coupled to a leaky cavity mode. As a result of the cooperative nature of these interactions, the system's dynamics is captured by the behavior of a single mean-field, collective spin. In this mean-field limit, it has recently been shown that the interplay between photon losses and periodic driving of light-matter coupling can lead to time-crystalline-like behavior of the collective spin (Gong et al 2018 Phys. Rev. Lett. 120 040404). In this work, we investigate whether such a Dicke time crystal (TC) is stable to perturbations that explicitly break the mean-field solvability of the conventional Dicke model. In particular, we consider the addition of short-range interactions between the atoms which breaks the collective coupling and leads to complex many-body dynamics. In this context, the interplay between periodic driving, dissipation and interactions yields a rich set of dynamical responses, including long-lived and metastable Dicke-TCs, where losses can cool down the many-body heating resulting from the continuous pump of energy from the periodic drive. Specifically, when the additional short-range interactions are ferromagnetic, we observe time crystalline behavior at non-perturbative values of the coupling strength, suggesting the possible existence of stable dynamical order in a driven-dissipative quantum many-body system. These findings illustrate the rich nature of novel dynamical responses with many-body character in quantum optics platforms.

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