Fluorescence Spectrum and Thermalization in a Driven Coupled Cavity Array

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 tr...

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Bibliographic Details
Published in:Physical review letters 2019-02, Vol.122 (4), p.043602-043602, Article 043602
Main Authors: Kilda, Dainius, Keeling, Jonathan
Format: Article
Language:English
Subjects:
Distribution functions
Economic models
Fluorescence
Holes
Lattices (mathematics)
Mathematical models
Temperature dependence
Thermalization (energy absorption)
Variation
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.043602