Stability of spin-orbit coupled Fermi gases with population imbalance

Details Stability of spin-orbit coupled Fermi gases with population imbalance Stability of spin-orbit coupled Fermi gases with population imbalance

2011-06-02

arxiv.org/abs/1106.0473v2

Phys.Rev.Lett.107:050402,2011

Physics

Condensed Matter

Quantum Gases

4+ pages with 3 figures; to appear in PRL

Scientific paper

10.1103/PhysRevLett.107.050402

We use the self-consistent mean-field theory to analyze the effects of Rashba-type spin-orbit coupling (SOC) on the ground-state phase diagram of population-imbalanced Fermi gases throughout the BCS-BEC evolution. We find that the SOC and population imbalance are counteracting, and that this competition tends to stabilize the uniform superfluid phase against the phase separation. However, we also show that the SOC stabilizes (destabilizes) the uniform superfluid phase against the normal phase for low (high) population imbalances. In addition, we find topological quantum phase transitions associated with the appearance of momentum space regions with zero quasiparticle energies, and study their signatures in the momentum distribution.

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