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

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

2009-10-26

arxiv.org/abs/0910.4940v5

Phys. Rev. B 81, 020508 (R) (2010).

Physics

Condensed Matter

Quantum Gases

accepted by Phys. Rev. B

Scientific paper

10.1103/PhysRevB.81.020508

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 $\pm\frac{\pi}{2}$, thus spontaneously breaking time-reversal symmetry. We also suggest the possibility of such mixing of triplet and singlet pairing in other systems.

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