Induced interaction in a Fermi gas with a BEC-BCS crossover (5 pages)
Induced interaction in a Fermi gas with a BEC-BCS crossover (5 pages)
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DOI：
10.1103/physreva.79.053636
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发表时间：
2009-05
期刊：
影响因子：
--
通讯作者：
Zeng-Qiang Yu;Kun Huang;L. Yin
中科院分区：
文献类型：
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作者：
Zeng-Qiang Yu;Kun Huang;L. Yin
利用玻色-爱因斯坦凝聚-巴丁-库珀-施里弗（BEC-BCS）交叉研究了诱导相互作用对费米气体超流体转变温度的影响。将Gorkov-Melik-Barkhudarov诱导相互作用理论从BCS侧扩展到整个交叉，并采用Nozieres和Schmitt-Rink的方法处理配对涨落。在均匀性下，诱导的相互作用使转变温度降低了约20%。Gorkov和Melik-Barkhudarov发现，在BCS极限下，转变温度降低了约2.22倍。我们的结果表明，诱导相互作用的影响是重要的，无论是在BCS侧和在单一区域。
We study the effect of the induced interaction on the superfluid transition temperature of a Fermi gas with a Bose-Einstein condensation-Bardeen-Cooper-Schrieffer (BEC-BCS) crossover. The Gorkov-Melik-Barkhudarov theory about the induced interaction is extended from the BCS side to the entire crossover and the pairing fluctuation is treated in the approach by Nozieres and Schmitt-Rink. At unitarity, the induced interaction reduces the transition temperature by about 20%. In the BCS limit, the transition temperature is reduced by a factor of about 2.22, as found by Gorkov and Melik-Barkhudarov. Our result shows that the effect of the induced interaction is important both on the BCS side and in the unitary region.