Mixed triplet and singlet pairing in ultracold multicomponent fermion systems with dipolar interactions
Mixed triplet and singlet pairing in ultracold multicomponent fermion systems with dipolar interactions
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DOI：
10.1103/physrevb.81.020508
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发表时间：
2009-10
影响因子：
3.7
通讯作者：
Congjun Wu;J. Hirsch
中科院分区：
文献类型：
--
作者：
Congjun Wu;J. Hirsch
研究了多组分超冷偶极分子体系的Cooper配对问题的对称性。偶极各向异性为三重态和单线态库珀配对的相互作用强度提高到一级提供了一种自然而有力的机制。在纯偶极相互作用中，类似${p}_{z}$的三态极对是最主要的。短程吸引相互作用可以使单重态对与三重态对接近简并。我们指出这两个配对通道可以通过发展$\ifmmode\pm\else\textpm\fi{}\frac{\ensuremath{\pi}}{2}$的相对相位来混合，从而自发地破坏时间反转对称性。我们还提出了在其他体系中存在三重态和单线态混合的可能性。
The symmetry properties of the Cooper pairing problem for multicomponent ultracold 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 $\ifmmode\pm\else\textpm\fi{}\frac{\ensuremath{\pi}}{2}$, thus spontaneously breaking time-reversal symmetry. We also suggest the possibility of such mixing of triplet and singlet pairing in other systems.