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 language | English |
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Pages (from-to) | 190-194 |
Number of pages | 5 |
Journal | Physica C: Superconductivity and its applications |
Volume | 437-438 |
Issue number | SPEC. ISS. |
DOIs | |
Publication status | Published - 2006 May 15 |
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