title: Enhancement effect of mass imbalance on Fulde-Ferrell-Larkin-Ovchinnikov type of pairing in Fermi-Fermi mixtures of ultracold quantum gases.
abstract: Ultracold two-component Fermi gases with a tunable population imbalance have provided an excellent opportunity for studying the exotic Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states, which have been of great interest in condensed matter physics. However, the FFLO states have not been observed experimentally in Fermi gases in three dimensions (3D), possibly due to their small phase space volume and extremely low temperature required for an equal-mass Fermi gas. Here we explore possible effects of mass imbalance, mainly in a6Li-40K mixture, on the one-plane-wave FFLO phases for a 3D homogeneous case at the mean-field level. We present various phase diagrams related to the FFLO states at both zero and finite temperatures, throughout the BCS-BEC crossover, and show that a large mass ratio may enhance substantially FFLO type of pairing.
authors.affiliation: Department of Physics and Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, Hefei, Anhui 230026, China.
authors.forename: Jibiao
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Physics and Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, Hefei, Anhui 230026, China.
authors.forename: Yanming
authors.initials: Y
authors.lastname: Che
authors.affiliation: Department of Physics and Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, Hefei, Anhui 230026, China.
authors.forename: Leifeng
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Physics and Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, Hefei, Anhui 230026, China.
authors.forename: Qijin
authors.initials: Q
authors.lastname: Chen