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Fluorescence spectrum and thermalization in a driven coupled cavity array

Research output: Contribution to journalArticle

Author(s)

Dainius Kilda, Jonathan Keeling

School/Research organisations

Abstract

We calculate the fluorescence spectra of a driven lattice of coupled cavities. To do this, we extend methods of evaluating two-time correlations in infinite lattices to open quantum systems; this allows access to momentum-resolved fluorescence spectrum. We illustrate this for a driven-dissipative transverse-field anisotropic XY model. By studying the fluctuation-dissipation theorem, we find the emergence of a quasithermalized steady state with a temperature dependent on system parameters; for blue-detuned driving, we show this effective temperature is negative. In the low excitation density limit, we compare these numerical results to analytical spin-wave theory, providing an understanding of the form of the distribution function and the origin of quasithermalization.
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Details

Original languageEnglish
Article number043602
Number of pages6
JournalPhysical Review Letters
Volume122
Issue number4
Early online date1 Feb 2019
DOIs
Publication statusPublished - 1 Feb 2019

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