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Enhancement effect of mass imbalance on Fulde-Ferrell-Larkin-Ovchinnikov type of pairing in Fermi-Fermi mixtures of ultracold quantum gases

机译:大规模不平衡对富尔费尔 - 费米混合物配对富德 - 费尔的富含梅子混合物的增强效应

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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 a 6Li–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.
机译:Ultracold双组分Fermi气体具有可调谐群体的不平衡,为研究异国情调的Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)国家提供了一个很好的机会,这对凝聚物物理学感兴趣。然而,FFLO状态尚未在三维(3D)中实验在Fermi气体中观察到,可能是由于它们的小相空间体积和相等质量费米气所需的极低温度。在这里,我们探讨了大规模不平衡的可能影响,主要是在6LI-40K混合物中,在平均场级别在3D均匀情况下的一平面波FFLO相上。我们在整个BCS-BEC交叉的交叉中呈现与零和有限温度的FFLO状态相关的各种相图,并且表明大质量比可以提高基本上FFLO类型的配对。

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