Coulomb interactions, gauge invariance, and phase transitions of the Dicke model

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

Phase transitions of a generalized Dicke model in the Coulomb gauge including A(2) terms in the matter-radiation coupling, as well as direct dipole dipole interaction terms-are studied. After a brief review of previous work on the 'no-go theorem' for phase transitions in the Dicke model, it is shown that a consistent truncation of the radiation modes and of the direct interactions leads to a model that does have a phase transition. When transformed to the electric dipole gauge, such a system takes exactly the form of the original Dicke Hamiltonian, which displays the expected phase transition.

Original languageEnglish
Pages (from-to)295213
Number of pages8
JournalJournal of Physics: Condensed Matter
Volume19
Issue number29
DOIs
Publication statusPublished - 25 Jul 2007

Keywords

  • QUANTIZED RADIATION FIELD
  • 2-LEVEL ATOMS
  • SYSTEMS
  • LENGTH

Fingerprint

Dive into the research topics of 'Coulomb interactions, gauge invariance, and phase transitions of the Dicke model'. Together they form a unique fingerprint.

Cite this