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Conventional and Unconventional Dicke Models: Multistabilities and Nonequilibrium Dynamics
1Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck, Austria.
Physical Review Letters
|March 1, 2024
Summary
This study explores a modified Dicke model with two spin ensembles, revealing coexisting superradiant states with distinct magnetic ordering. Semiclassical and quantum calculations confirm multistability and nonstationary dynamics in this quantum system.
Area of Science:
- Quantum optics
- Condensed matter physics
- Atomic physics
Background:
- The Dicke model describes collective atomic behavior in a quantized cavity field.
- It features a quantum phase transition to a superradiant state with spin ordering.
Purpose of the Study:
- Introduce a variant of the Dicke model with two spin ensembles interacting with a single cavity field.
- Investigate the emergence of distinct superradiant states and their dynamics.
Main Methods:
- Utilized a semiclassical approach to analyze stability and dynamics in the thermodynamic limit.
- Performed small-scale, full quantum-mechanical calculations for validation.
Main Results:
- Demonstrated the coexistence of two distinct superradiant states (ferromagnetic and ferrimagnetic spin ordering).
- Identified nonstationary behaviors arising from multistability in the system.
- Confirmed consistency between semiclassical and quantum mechanical results.
Conclusions:
- The modified Dicke model with differential coupling supports rich quantum phenomena.
- Coexisting superradiant states and complex dynamics are key features of this system.
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