Thermal phase transitions for Dicke-type models in the ultrastrong-coupling limit
Carregando...
Data
2012-07-18
Autores
Aparicio Alcalde, M. [UNESP]
Bucher, M.
Emary, C.
Brandes, T.
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.