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Nonreciprocal Dicke Model.

Ezequiel I Rodríguez Chiacchio1, Andreas Nunnenkamp2, Matteo Brunelli3

  • 1Entropica Labs, 186B Telok Ayer Street 068632, Singapore, Singapore.

Physical Review Letters
|September 29, 2023
PubMed
Summary
This summary is machine-generated.

We explore a nonreciprocal Dicke model, revealing parity-time (PT) symmetry breaking as the cause of a nonstationary phase. This PT symmetry breaking demonstrates a new type of nonreciprocal phase transition without requiring broken symmetry or exceptional points.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Many-body physics

Background:

  • The Dicke model describes light-matter interactions.
  • Nonreciprocity in physical systems is an active area of research.
  • Parity-time (PT) symmetry has emerged as a key concept in non-Hermitian physics.

Purpose of the Study:

  • To investigate an open two-component Dicke model with nonreciprocal interactions mediated by a light field.
  • To characterize the nonstationary phase in this model.
  • To explore the connection between PT symmetry breaking and nonreciprocal phase transitions.

Main Methods:

  • Theoretical analysis of an open two-component Dicke model.
  • Identification and analysis of discrete parity-time (PT) symmetry.
  • Characterization of the nonstationary phase as spontaneous PT symmetry breaking.
  • Demonstration of a nonreciprocal phase transition without broken symmetry or exceptional points.

Main Results:

  • The nonreciprocal Dicke model exhibits discrete PT symmetry.
  • The nonstationary phase arises from spontaneous PT symmetry breaking.
  • This PT symmetry breaking constitutes a nonreciprocal phase transition.
  • The transition occurs without requiring broken symmetry or exceptional points in the spectrum.

Conclusions:

  • Driven-dissipative light-matter systems provide a novel platform for studying nonreciprocal phase transitions.
  • The findings expand the understanding of nonreciprocal collective phenomena.
  • This work challenges existing paradigms for nonreciprocal phase transitions.