Thermal phase transitions for Dicke-type models in the ultra-strong coupling limit

Details Thermal phase transitions for Dicke-type models in the ultra-strong coupling limit Thermal phase transitions for Dicke-type models in the ultra-strong coupling limit

2012-04-10

arxiv.org/abs/1204.2271v1

Physics

Condensed Matter

Quantum Gases

4 pages Brief Report style

Scientific paper

We consider the Dicke model in the ultra-strong coupling limit to investigate thermal phase transitions and their precursors at finite particle numbers $N$ for bosonic and fermionic systems. We derive partition functions with degeneracy factors that account for the number of configurations and derive explicit expressions for the Landau free energy. This allows us to discuss the difference between the original Dicke (fermionic) and the bosonic case. We find a crossover between these two cases that shows up, e.g., in the specific heat.

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