Unconventional superfluidity induced by spin-orbital coupling in a polarized two-dimensional Fermi gas

Details Unconventional superfluidity induced by spin-orbital coupling in a polarized two-dimensional Fermi gas Unconventional superfluidity induced by spin-orbital coupling in a polarized two-dimensional Fermi gas

2011-10-11

arxiv.org/abs/1110.2241v1

Physics

Condensed Matter

Quantum Gases

Scientific paper

We show the spin-orbital coupling induced by an artificial light-induced gauge field can fully restore superfluidity suppressed by population imbalance in a two-dimensional (2D) Fermi gas, leading to unconventional superfluid states either with topological Majorana fermion excitations or showing a novel mixture of triplet pairing with spin-up (down) components respectively in the $p_{x}\pm ip_{y}$ pairing channels. We self-consistently calculate the zero temperature phase diagram at the BCS\ side of Feshbach resonance and show that the phase transitions between different superfluid states can be revealed through measurement of the in-situ density profile of the 2D atomic cloud in a weak global trap.

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