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Bulletin of the American Physical Society

Finite temperature effects of $^{6}$Li-$^{40}$K mixtures in the BCS-BEC crossover

Hao Guo, Chih-Chun Chien, Yan He, Qijin Chen, Kathryn Levin

Published Mar 16, 2009• 0 citations
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Exotic phase separation and phase diagrams of a Fermi-Fermi mixture in a trap at finite temperature

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The pairing and superfluid phenomena in a two-component Fermi gas can be strongly affected by the population and mass imbalances. Here we present phase diagrams of an atomic Fermi-Fermi mixture as they undergo BCS--Bose-Einstein condensation (BEC) crossover using a pairing fluctuation theory. We focus on the finite temperature and trap effects, with an emphasis on the mixture of ${}^{6}$Li and ${}^{40}$K. We show that there exist exotic types of phase separation in the (near-)BEC regime, associated with a pseudogap effect. Moreover, in the BCS and unitary regimes, the spatial density and gap profiles exhibit sandwichlike shell structures with superfluid or pseudogapped normal state in the middle shell. Such a sandwichlike shell structure appears when the mass imbalance increases beyond a certain threshold. Our result is relevant to future experiments on the ${}^{6}$Li-${}^{40}$K and other possible Fermi-Fermi mixtures.

arXiv:1208.1455•Physical Review A•Apr 11, 2013•13 citations
Finite temperature effects of 6^{6}6Li-40^{40}40K mixtures in the BCS-BEC crossover
Pairing of Fermionic 6^66Li Throughout the BEC-BCS Crossover
Studying the BEC-BCS crossover with an ultracold gas of 6^{6}6Li atoms
Optical Molecular Spectroscopy of the BEC/BCS Crossover in 6^{6}6Li
Studying the BCS-BEC crossover regime with a Fermi gas of 40^{40}40K atoms
The pairing and superfluid phenomena in a two-component Fermi gas can be strongly affected by the population and mass imbalances. Here we present phase diagrams of an atomic Fermi-Fermi mixture as they undergo BCS--Bose-Einstein condensation (BEC) crossover using a pairing fluctuation theory. We focus on the finite temperature and trap effects, with an emphasis on the mixture of 6{}^{6}6Li and 40{}^{40}40K. We show that there exist exotic types of phase separation in the (near-)BEC regime, associated with a pseudogap effect. Moreover, in the BCS and unitary regimes, the spatial density and gap profiles exhibit sandwichlike shell structures with superfluid or pseudogapped normal state in the middle shell. Such a sandwichlike shell structure appears when the mass imbalance increases beyond a certain threshold. Our result is relevant to future experiments on the 6{}^{6}6Li-40{}^{40}40K and other possible Fermi-Fermi mixtures.