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

S. Tsuchiya, R. Watanabe, Yoji Ohashi

Research output: Contribution to journalArticle

Abstract

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
JournalPhysica C: Superconductivity and its Applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec

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crossovers
Gases
gases
Superconducting transition temperature
Phase diagrams
transition temperature
phase diagrams
Temperature
temperature
approximation
interactions

Keywords

  • Atomic Fermi gas
  • BCS-BEC crossover
  • Pseudogap

ASJC Scopus subject areas

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

Cite this

Pseudogap behaviors of atomic Fermi gases above Tc in the BCS-BEC crossover. / Tsuchiya, S.; Watanabe, R.; Ohashi, Yoji.

In: Physica C: Superconductivity and its Applications, Vol. 470, No. SUPPL.1, 12.2010.

Research output: Contribution to journalArticle

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AB - 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.

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