Abstract
We investigate magnetic properties of a strongly interacting ultracold Fermi gas. Within the framework of an extended T-matrix approximation, we calculate the spin susceptibility χ in the unitarity limit. We show that effects of pairing fluctuations on this magnetic quantity are quite different in between the normal state and the superfluid phase. In the normal state, pairing fluctuations cause spin-gap phenomenon near the superfluid phase transition temperature Tc, where χ is anomalously suppressed. In the superfluid phase, on the other hand, the ordinary suppression of χ by the BCS energy gap is weakened by pairing fluctuations, because they induce finite density of states inside the gap. Our results indicate that the spin susceptibility is a useful quantity for the study of pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas.
| Original language | English |
|---|---|
| Article number | 012019 |
| Journal | Journal of Physics: Conference Series |
| Volume | 568 |
| DOIs | |
| Publication status | Published - 2014 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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Spin-gap phenomenon in a strongly interacting ultracold Fermi gas. / Tajima, H.; Hanai, R.; Ohashi, Yoji.
In: Journal of Physics: Conference Series, Vol. 568, 012019, 2014.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Spin-gap phenomenon in a strongly interacting ultracold Fermi gas
AU - Tajima, H.
AU - Hanai, R.
AU - Ohashi, Yoji
PY - 2014
Y1 - 2014
N2 - We investigate magnetic properties of a strongly interacting ultracold Fermi gas. Within the framework of an extended T-matrix approximation, we calculate the spin susceptibility χ in the unitarity limit. We show that effects of pairing fluctuations on this magnetic quantity are quite different in between the normal state and the superfluid phase. In the normal state, pairing fluctuations cause spin-gap phenomenon near the superfluid phase transition temperature Tc, where χ is anomalously suppressed. In the superfluid phase, on the other hand, the ordinary suppression of χ by the BCS energy gap is weakened by pairing fluctuations, because they induce finite density of states inside the gap. Our results indicate that the spin susceptibility is a useful quantity for the study of pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas.
AB - We investigate magnetic properties of a strongly interacting ultracold Fermi gas. Within the framework of an extended T-matrix approximation, we calculate the spin susceptibility χ in the unitarity limit. We show that effects of pairing fluctuations on this magnetic quantity are quite different in between the normal state and the superfluid phase. In the normal state, pairing fluctuations cause spin-gap phenomenon near the superfluid phase transition temperature Tc, where χ is anomalously suppressed. In the superfluid phase, on the other hand, the ordinary suppression of χ by the BCS energy gap is weakened by pairing fluctuations, because they induce finite density of states inside the gap. Our results indicate that the spin susceptibility is a useful quantity for the study of pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas.
UR - http://www.scopus.com/inward/record.url?scp=84919667359&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84919667359&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/568/1/012019
DO - 10.1088/1742-6596/568/1/012019
M3 - Article
AN - SCOPUS:84919667359
VL - 568
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
M1 - 012019
ER -