Single-particle properties and pseudogap effects in the BCS-BEC crossover regime of an ultracold Fermi gas above Tc

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 80, Issue 3, 2009, Pages

  Tsuchiya, Shunji ^a,b   Watanabe, Ryota ^a   Ohashi, Yoji ^a,b  

^a KEIO UNIVERSITY   (Japan)

^b JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

BCS-BEC CROSSOVER; BOSE-EINSTEIN CONDENSATES; BOUND MOLECULES; CHARACTERISTIC TEMPERATURE; CROSSOVER REGIONS; DIP STRUCTURES; DOUBLE PEAK STRUCTURE; FERMI GAS; GAP ENERGY; PAIRING FLUCTUATIONS; PSEUDO-GAP; PSEUDOGAP TEMPERATURE; SINGLE-PARTICLE; SPECTRAL WEIGHT; STRONG-COUPLING; SUPERFLUID PHASE; T-MATRIX; ULTRA-COLD; WEAK COUPLINGS;

BINDING ENERGY; BOSE-EINSTEIN CONDENSATION; ELECTRON GAS; PHASE DIAGRAMS; PHASE TRANSITIONS; STEAM CONDENSERS; SUPERFLUID HELIUM; TECHNETIUM;

FERMIONS;

EID: 70349254018     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.80.033613     Document Type: Article

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41. In this paper, we determine T□ as the temperature when the region of dρ (ω) /dω<0 disappears.
42. When we plot ABCS (p,ω) in the energy-momentum plane, the BCS gap symmetrically appears as ω=±Δ at p= kF. In Fig. 8, although the region where the peak line is suppressed is not symmetric with respect to ω=0, this is simply due to the noninteracting Green's function G p (i ωn) 0 used to calculate the self-energy. When the shift of the chemical potential by the self-energy correction is correctly included in G p (i ωn) 0, it has been shown that the pseudogapped region in A (p,ω) appears symmetrically with respect to ω=0. For more details, see Ref..
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44. In this paper, we determine T□□ as the temperature when the double-peak structure of A (p,ω) at p= 2mμ vanishes, when μ>0. In the BEC regime where μ≤0, we use the spectral weight at p=0 for this purpose.