NORDITA, Roslagstullsbacken 21, 106 91 Stockholm, Sweden.
Phys Rev Lett. 2009 Dec 31;103(26):260403. doi: 10.1103/PhysRevLett.103.260403. Epub 2009 Dec 28.
We study many-body contributions to the effective interaction between fermions in a three-component Fermi mixture. We find that effective interactions induced by the third component can lead to a phase diagram different from that predicted if interactions with the third component are neglected. As a result, in a confining potential a superfluid shell structure can arise even for equal populations of the components. We also find a critical temperature for the BCS transition in a 6Li mixture which can deviate strongly from the one in a weakly interacting two-component system.
我们研究了三分量费米混合物中费米子之间有效相互作用的多体贡献。我们发现，第三分量引起的有效相互作用如果被忽略，可能导致与第三分量的相互作用不同的相图。因此，即使在各分量的密度相等的情况下，在限制势中也可能出现超流壳层结构。我们还发现，在 6Li 混合物中，BCS 相变的临界温度可能与弱相互作用的两分量系统中的临界温度有很大的偏离。
