Evolution from BCS to BEC superfluidity in the presence of spin-orbit coupling

Abstract

We discuss the evolution from BCS to BEC superfluids in the presence of spin-orbit coupling, and show that this evolution is just a crossover in the balanced case. The dependence of several thermodynamic properties, such as the chemical potential, order parameter, pressure, entropy, isothermal compressibility and spin susceptibility tensor on the spin-orbit coupling and interaction parameter at low temperatures are analyzed. We studied both the case of equal Rashba and Dresselhaus (ERD) and the Rashba-only (RO) spin-orbit coupling. Comparisons between the two cases reveal several striking differences in the corresponding thermodynamic quantities. Finally we propose measuring the spin susceptibility as a means to detect the spin-orbit coupling effect.

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• A spin-orbit coupled Bose-Einstein condensate
• BCS-BEC Crossover and Topological Phase Transition in 3D Spin-Orbit Coupled Degenerate Fermi Gases
• Probing anisotropic superfluidity of rashbons in atomic Fermi gases
• Spin-Orbit Coupled Fermi Gases across a Feshbach Resonance
• BCS-BEC crossover induced by a synthetic non-Abelian gauge field
• Two-species fermion mixtures with population imbalance

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