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Dissipation-Induced Superradiance in a Non-Markovian Open Dicke Model

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Abstract

We consider the Dicke model, describing an ensemble of $N$ quantum spins interacting with a cavity field, and study how the coupling to a non-Markovian environment with power-law spectrum changes the physics of superradiant phase transition. Quite remarkably we find that dissipation can induce, rather than suppress, the ordered phase, a result which is in striking contrast with both thermal and Markovian quantum baths. We interpret this dissipation-induced superradiance as a genuine dissipative quantum phase transition that exists even at finite $N$ due to the coupling with the bath modes and whose nature and critical properties strongly depend on the spectral features of the non-Markovian environment.
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cea-01466611 , version 1 (13-02-2017)

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Orazio Scarlatella, Marco Schiró. Dissipation-Induced Superradiance in a Non-Markovian Open Dicke Model. 2017. ⟨cea-01466611⟩
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