The non-reciprocal Dicke model
- URL: http://arxiv.org/abs/2302.06386v2
- Date: Mon, 18 Sep 2023 17:47:58 GMT
- Title: The non-reciprocal Dicke model
- Authors: Ezequiel I. Rodr\'iguez Chiacchio, Andreas Nunnenkamp, Matteo Brunelli
- Abstract summary: We investigate the physics of an open two-component Dicke model, where the light field mediates non-reciprocal interactions between two spin species.
We show that the model exhibits a discrete parity-time ($mathcalPT$) symmetry and we characterize the emergence of a non-stationary phase, so far explained in terms of dissipation-induced instability.
Our results establish driven-dissipative light-matter systems as a new avenue for exploring non-reciprocal phase transitions and contribute to the theory of non-reciprocal collective phenomena.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We investigate the physics of an open two-component Dicke model, where the
light field mediates non-reciprocal interactions between two spin species. We
show that the model, which we dub non-reciprocal Dicke model, exhibits a
discrete parity-time ($\mathcal{PT}$) symmetry and we characterize the
emergence of a non-stationary phase, so far explained in terms of
dissipation-induced instability, as spontaneous breaking of $\mathcal{PT}$
symmetry. We further show that such $\mathcal{PT}$ symmetry breaking embodies
an instance of a non-reciprocal phase transition, a concept recently introduced
by Fruchart $et$ $al.$ [Nature ${\bf 592}$, 363 (2021)]. Remarkably, the phase
transition in our model does not necessitate the presence of any underlying
broken symmetry or exceptional points in the spectrum, both believed to be
essential requirements for non-reciprocal phase transitions. Our results
establish driven-dissipative light-matter systems as a new avenue for exploring
non-reciprocal phase transitions and contribute to the theory of non-reciprocal
collective phenomena.
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