Condensed Matter > Quantum Gases
[Submitted on 20 Sep 2019 (v1), last revised 6 Mar 2020 (this version, v2)]
Title:Distinguishing phases using the dynamical response of driven-dissipative light-matter systems
View PDFAbstract:We present a peculiar transition triggered by infinitesimal dissipation in the interpolating Dicke-Tavis-Cummings model. The model describes a ubiquitous light-matter setting using a collection of two-level systems interacting with quantum light trapped in an optical cavity. In a previous work [Phys. Rev. Lett. 120, 183603 (2018)], dissipation was shown to extend a normal phase (dark state) into new regions of the model's parameter space. Harnessing Keldysh's action formalism to compute the response function of the light, we show that the normal phase does not merely spread but encompasses a transition between the old and the dissipation-stabilized regimes of the normal phase. This transition, however, solely manifests in the dynamical fluctuations atop the empty cavity, through stabilization of an excited state of the closed system. Consequently, we reveal that the fluctuations flip from being particlelike to holelike across this transition. This inversion is also accompanied by the behavior of the Liouvillian eigenvalues akin to exceptional points. Our work forges the way to discovering transitions in a wide variety of driven-dissipative systems and is highly pertinent for current experiments.
Submission history
From: Matteo Soriente [view email][v1] Fri, 20 Sep 2019 15:08:25 UTC (527 KB)
[v2] Fri, 6 Mar 2020 14:48:49 UTC (1,441 KB)
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