BCS-BEC crossover in an asymmetric two-component Fermi gas
BCS-BEC crossover in an asymmetric two-component Fermi gas
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DOI：
10.1209/epl/i2006-10136-3
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发表时间：
2006-03
期刊：
影响因子：
--
通讯作者：
Xiaji Liu;Hui Hu
中科院分区：
文献类型：
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作者：
Xiaji Liu;Hui Hu
We discuss the superfluid phase transition of a strongly interacting Fermi gas with unequal (asymmetric) chemical potentials in two pairing hyperfine states, and map out its phase diagram near the BCS-BEC crossover. Our approach includes the fluctuation contributions of “preformed Cooper pairs” to the thermodynamic potential at finite temperature. We show that, below a critical difference in chemical potentials between species, a normal gas is unstable towards the formation of either a finite-momentum paired Fulde-Ferrell-Larkin-Ovchinnikov superconducting phase or a uniform superfluid, depending on the asymmetry and interaction strengths. We determine the value of critical chemical potential mismatch, and find that it is consistent with a recent measurement by Zwierlein et al. (Science, 311 (2006) 492).
