Collective excitations in superconductors: From Bardeen-Cooper-Schrieffer theory to Bose condensation

Jorge Osvaldo Sofo, C. A. Balseiro, H. E. Castillo

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We study the collective excitations of a system with local attractive interactions as a function of the coupling strength. The two-particle excitations are obtained in the random-phase approximation. For the strong-coupling limit we reproduce the excitation spectrum of a hard-core Bose gas, while in the weak-coupling limit we obtained a spectrum consistent with the BCS picture. The evolution of the excitation spectrum from the weak- to the strong-coupling limits is continuous. We briefly discuss the effect of these excitations in the thermodynamic properties of the system.

Original languageEnglish (US)
Pages (from-to)9860-9864
Number of pages5
JournalPhysical Review B
Volume45
Issue number17
DOIs
StatePublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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