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

2012/04/10 by M. Aparicio Alcalde, M. Bucher, Alcalde, M. Aparicio +5 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Quantum Gases (cond-mat.quant-gas) #Quantum Physics (quant-ph) #cond-mat.quant-gas #quant-ph

paper · pdf · doi:10.48550/arxiv.1204.2271

4 pages Brief Report style

arxiv created 2012/04/10 · arxiv updated 2012/04/12

Abstract

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.

Cited by

• Generalized Holstein-Primakoff mapping and 1/N expansion of collective spin systems undergoing single particle dissipation

Related

• Functional Methods in the Generalized Dicke Model
• Path integral approach to the full Dicke model
• The disordered Dicke model
• Phase Transitions in Open Dicke Model: a degenerate perturbation theory approach
• Signatures of a quantum phase transition on a single-mode bosonic model