Revealing the nature of nonequilibrium phase transitions with quantum trajectories

Research output: Contribution to journalResearch articleContributedpeer-review

Abstract

A damped and driven collective spin system is analyzed by using quantum state diffusion. This approach
allows for a mostly analytical treatment of the investigated nonequilibrium quantum many-body dynamics, which
features a phase transition in the thermodynamical limit. The exact results obtained in this work, which are free of
any finite-size defects, provide a complete understanding of the model. Moreover, the trajectory framework gives
an intuitive picture of the two phases occurring, revealing a spontaneously broken symmetry and allowing for
a qualitative and quantitative characterization of the phases. We determine exact critical exponents, investigate
finite-size scaling, and explain a remarkable nonalgebraic behavior at the transition in terms of torus hopping.

Details

Original languageEnglish
Number of pages7
JournalPhysical Review A
Issue number062120
Publication statusPublished - 2019
Peer-reviewedYes

External IDs

Scopus 85068132965
ORCID /0000-0002-7806-3525/work/142234166
ORCID /0000-0002-1520-7931/work/142246620

Keywords

Keywords

  • COOPERATIVE FLUORESCENCE, STATE DIFFUSION, SUPERFLUID, GAS