Nonergodicity in the Anisotropic Dicke Model

Wouter Buijsman, Vladimir Gritsev, Rudolf Sprik

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


We study the ergodic-nonergodic transition in a generalized Dicke model with independent corotating and counterrotating light-matter coupling terms. By studying level statistics, the average ratio of consecutive level spacings, and the quantum butterfly effect (out-of-time correlation) as a dynamical probe, we show that the ergodic-nonergodic transition in the Dicke model is a consequence of the proximity to the integrable limit of the model when one of the couplings is set to zero. This can be interpreted as a hint for the existence of a quantum analogue of the classical Kolmogorov-Arnold-Moser theorem. In addition, we show that there is no intrinsic relation between the ergodic-nonergodic transition and the precursors of the normal-superradiant quantum phase transition.

Original languageEnglish
Article number080601
JournalPhysical Review Letters
Issue number8
StatePublished - 23 Feb 2017
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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