Nonequilibrium Quantum Criticality and Non-Markovian Environment: Critical Exponent of a Quantum Phase Transition

D. Nagy, P. Domokos

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21 Citations (Scopus)


We show that the critical exponent of a quantum phase transition in a damped-driven open system is determined by the spectral density function of the reservoir. We consider the open-system variant of the Dicke model, where the driven boson mode and also the large N spin couple to independent reservoirs at zero temperature. The critical exponent, which is 1 if there is no spin-bath coupling, decreases below 1 when the spin couples to a sub-Ohmic reservoir.

Original languageEnglish
Article number043601
JournalPhysical review letters
Issue number4
Publication statusPublished - Jul 21 2015


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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