Fingerprint of chaos and quantum scars in kicked Dicke model: An out-of-time-order correlator study

Sudip Sinha, Sayak Ray, Subhasis Sinha

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We investigate the onset of chaos in a periodically kicked Dicke model (KDM), using the out-of-time-order correlator (OTOC) as a diagnostic tool, in both the oscillator and the spin subspaces. In the large spin limit, the classical Hamiltonian map is constructed, which allows us to investigate the corresponding phase space dynamics and to compute the Lyapunov exponent. We show that the growth rate of the OTOC for the canonically conjugate coordinates of the oscillator is able to capture the Lyapunov exponent in the chaotic regime. The onset of chaos is further investigated using the saturation value of the OTOC, that can serve as an alternate indicator of chaos in a generic interacting quantum system. This is also supported by a system independent effective random matrix model. We further identify the quantum scars in KDM and detect their dynamical signature by using the OTOC dynamics. The relevance of the present study in the context of ongoing cold atom experiments is also discussed.

Original languageEnglish
Article number174005
JournalJournal of Physics Condensed Matter
Issue number17
StatePublished - 1 Apr 2021
Externally publishedYes


  • driven system
  • quantum chaos
  • quantum dynamics
  • quantum scars

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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