Pairing effects in the normal phase of a two-dimensional Fermi gas
arXiv:1406.7761 · doi:10.1103/PhysRevB.91.054509
Abstract
In a recent experiment [M. Feld et al., Nature 480, 75 (2011); B. Froehlich et al., Phys. Rev. Lett. 109,130403 (2012)], a pairing gap was detected in a two-dimensional (2D) Fermi gas with attractive interaction at temperatures where superfluidity does not occur. The question remains open as to whether this gap is a pseudogap phenomenon or is due to a molecular state. In this paper, by using a t-matrix approach, we reproduce quite well the experimental data for a 2D Fermi gas, and set the boundary between the pseudogap and molecular regimes. We also show that pseudogap phenomena occurring in 2D and 3D can be related through a variable spanning the BCS-BEC crossover in a universal way.
10 pages, 9 figures; final version
References in corpus (8)
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- BCS-BEC Crossover and Pairing Fluctuations in a Two Band Superfluid/Superconductor: A T Matrix Approach
- Potassium-Doped Para-Terphenyl: Structure, Electrical Transport Properties and Possible Signatures of a Superconducting Transition
- Mobile impurity probing a two-dimensional superfluid phase transition
- Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases
- Pseudogap regime of a two-dimensional uniform Fermi gas
- Pseudogap phenomena near the BKT transition of a two-dimensional ultracold Fermi gas in the crossover region
- Peaks and widths of radio-frequency spectra: An analysis of the phase diagram of ultra-cold Fermi gases
- Amplitude, phase, and topological fluctuations shaping the complex phase diagram of two-dimensional superconductors
- Precision thermodynamics of the strongly interacting Fermi gas in two dimensions
- Tunneling spectra of unconventional quasi-two-dimensional superconductors