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arXiv 0910.4940cond-mat.quant-gascond-mat.supr-con
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偶极作用下多组分超冷费米子系统中的混合三重态和单重态配对

Mixed triplet and singlet pairing in multicomponent ultracold fermion systems with dipolar interactions

Congjun Wu, J. E. Hirsch

摘要:

研究了多组分超冷偶极分子体系库珀配对问题的对称性。偶极各向异性为三重态和单重态库珀配对提供了一种自然和稳健的机制,使相互作用强度达到一级。对于纯偶极相互作用,三重$p_z$样极性配对是最主要的。短程吸引相互作用可以增强单重态配对,使其与三重态配对接近简并。我们指出,这两个配对通道可以通过发展$\pm\fracπ{2}$的相对相位来混合,从而自发地打破时间反演对称性。我们还建议在其他系统中的这种混合的三重态和单重态配对的可能性。

英文摘要:

The symmetry properties of the Cooper pairing problem for multi-component ultra-cold dipolar molecular systems are investigated. The dipolar anisotropy provides a natural and robust mechanism for both triplet and singlet Cooper pairing to first order in the interaction strength. With a purely dipolar interaction, the triplet $p_z$-like polar pairing is the most dominant. A short-range attractive interaction can enhance the singlet pairing to be nearly degenerate with the triplet pairing. We point out that these two pairing channels can mix by developing a relative phase of $\pm\fracπ{2}$, thus spontaneously breaking time-reversal symmetry. We also suggest the possibility of such mixing of triplet and singlet pairing in other systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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