3 years ago

Superfluids with finite-momentum pairing in spinless ultracold Fermi gases.

Zhen Zheng, Zhen-Fei Zheng, Xu-Bo Zou, Guang-Can Guo

Superfluid state with finite-momentum pairing, which is nominated as the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state by its predictors, is well studied in spin-singlet superfluids in past decades. Different from previous works that engineer the FFLO state in spinful cold atoms, we show that the FFLO state can emerge in spinless Fermi gases confined in optical lattice associated with nearest-neighbor interactions. The mechanism of the spinless FFLO state relies on the split Fermi surfaces by tuning the chemistry potential, which naturally gives rise to finite-momentum Cooper pairings. The phase transition is accompanied by changed Chern numbers, in which, different from the conventional picture, the band gap does not close. Taking fluctuations into considerations, we find the finite-momentum pairing is more robust, yielding the system promising for maintaining the FFLO state at finite temperature. Finally we present the possible realization and detection scheme of the spinless FFLO state.

Publisher URL: http://arxiv.org/abs/1705.03205

DOI: arXiv:1705.03205v2

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