Pseudogap behaviors of atomic Fermi gases above Tc in the BCS-BEC crossover

S. Tsuchiya, R. Watanabe, Y. Ohashi

Research output: Contribution to journalArticlepeer-review


We investigate pseudogap behaviors of an ultracold Fermi gas in the BCS-BEC crossover above the superfluid transition temperature Tc. We calculate the single-particle density of states (DOS), as well as the spectral weight, over the entire BCS-BEC crossover region, including strong pairing fluctuations within a T-matrix approximation. We show that the pseudogap structure in DOS develops from the weak-coupling BCS region, and continuously changes into a fully gapped one in the strong-coupling BEC region. We determine the pseudogap temperature T at which the dip structure in DOS disappears, and identify the pseudogap region in the phase diagram in terms of temperatures and pairing interactions.

Original languageEnglish
Pages (from-to)S986-S988
JournalPhysica C: Superconductivity and its applications
Issue numberSUPPL.1
Publication statusPublished - 2010 Dec


  • Atomic Fermi gas
  • BCS-BEC crossover
  • Pseudogap

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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