Finite-size scaling in the quantum phase transition of the open-system Dicke model

G. Kónya, D. Nagy, G. Szirmai, P. Domokos

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A laser-driven Bose-Einstein condensate of ultracold atoms loaded into a lossy high-finesse optical resonator exhibits critical behavior and, in the thermodynamic limit, a phase transition between stationary states of different symmetries. The system realizes an open-system variant of the celebrated Dicke model. We study the transition for a finite number of atoms by means of a Hartree-Fock-Bogoliubov method adapted to a damped-driven open system. The finite-size scaling exponents are determined and a clear distinction between the nonequilibrium and equilibrium quantum criticality is found.

Original languageEnglish
Article number013641
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume86
Issue number1
DOIs
Publication statusPublished - Jul 27 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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