1. Spin-orbit coupling effects on the superfluidity of a Fermi gas in an optical lattice.
- Author
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Sun, Q., Zhu, G. -B., Liu, W. -M., and Ji, A. -C.
- Subjects
- *
SPIN-orbit interactions , *SUPERFLUIDITY , *ELECTRON gas , *OPTICAL lattices , *DIRAC equation , *SEMIMETALS , *BOUND states - Abstract
We investigate the superfluidity of attractive Fermi gas in a square optical lattice with spin-orbit coupling (SOC). We show that the system displays a variety of new features. At half filling, SOC induces a Dirac semimetal and the system undergoes a semimetal-superfluid transition. Near half filling, we find that the superfluidity tends to be suppressed due to the emerging Dirac cones. While for small fillings, SOC can induce a BCS-BEC crossover beyond the conventional attractive Hubbard model, which is characterized by a bound state in the lattices. Moreover, we demonstrate that the superfluid density also exhibits many unusual properties in the lattices. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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