Stability of spin-orbit coupled Fermi gases with population imbalance

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 competi...

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Bibliographic Details
Published inarXiv.org
Main Authors Iskin, M, Subasi, A L
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 29.06.2011
Subjects
Fermi gases
Fluids
Mean field theory
Momentum
Orbital stability
Phase diagrams
Phase separation
Phase transitions
Physics - Quantum Gases
Physics - Strongly Correlated Electrons
Physics - Superconductivity
Population
Quantum theory
Spin-orbit interactions
Superfluidity
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1106.0473