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

Carregando...
Imagem de Miniatura

Data

2012-07-18

Título da Revista

ISSN da Revista

Título de Volume

Editor

Amer Physical Soc

Resumo

We consider the Dicke model in the ultrastrong-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, for example, in the specific heat.

Descrição

Palavras-chave

Como citar

Physical Review E. College Pk: Amer Physical Soc, v. 86, n. 1, p. 4, 2012.