Fluorescence spectrum and thermalization in a driven coupled cavity array
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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.
Kilda , D & Keeling , J 2019 , ' Fluorescence spectrum and thermalization in a driven coupled cavity array ' Physical Review Letters , vol. 122 , no. 4 , 043602 . DOI: 10.1103/PhysRevLett.122.043602
Physical Review Letters
© 2019, American Physical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.122.043602
DescriptionFunding: EPSRC CM-CDT (EP/L015110/1) (DK), EPSRC program TOPNES (EP/I031014/1) (JK).
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