Vortex structure from BCS to BEC superfluid

Masahiko Machida, Tomio Koyama, Yoji Ohashi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In atomic Fermi gases, the pairing character changes from BCS-like to BEC-like when decreasing the threshold energy of the Feshbach resonance. With this crossover, the system enters a strong-coupling regime through the population enhancement of diatom molecules, i.e., tightly bound Cooper pair, and the vortex structure shows much different features in contrast to the well-known core structure in BCS superfluid. In this paper, we study the structure of a single quantized vortex by numerically solving the generalized Bogoliubov-de Gennes equation derived from the boson-fermion model and clarify how the vortex structure changes with the crossover from BCS to BEC. As a result of numerical calculations, we find that the presence of the diatom molecular condensate enhances the matter density depletion inside the vortex core in the crossover regime and the Caroli-de Gennes-Matricon (CdGM) quasi-particle branch almost diminishes in BEC regime.

Original languageEnglish
Pages (from-to)190-194
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume437-438
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2006 May 15
Externally publishedYes

Keywords

  • BCS-BEC crossover
  • Bogoliubov-de Gennes equation
  • Fermi atom gas
  • Vortex core structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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