Topological superfluid in a trapped two-dimensional polarized Fermi gas with spin-orbit coupling

Journal Article · Thu Dec 15 00:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.063603· OSTI ID:22095654

Jing, Zhou; Wei, Yi ^[1]; Wei, Zhang ^[2]

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1. Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026 (China)
2. Department of Physics, Renmin University of China, Beijing 100872 (China)

We study the stability region of the topological superfluid phase in a trapped two-dimensional polarized Fermi gas with spin-orbit coupling and across a BCS-BEC crossover. Due to the competition between polarization, pairing interaction, and spin-orbit coupling, the Fermi gas typically phase-separates in the trap. Employing a mean-field approach that guarantees the ground-state solution, we systematically study the structure of the phase separation and investigate in detail the optimal parameter region for the preparation of the topologically nontrivial superfluid phase. We then calculate the momentum space density distribution of the topological superfluid state and demonstrate that the existence of the phase leaves a unique signature in the trap integrated momentum space density distribution which can survive the time-of-flight imaging process.

• OSTI ID: 22095654
• Journal Information: Physical Review. A, Vol. 84, Issue 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
BCS THEORY
FERMI GAS
GROUND STATES
L-S COUPLING
MATHEMATICAL SOLUTIONS
MEAN-FIELD THEORY
PAIRING INTERACTIONS
POLARIZATION
SUPERFLUIDITY
TIME-OF-FLIGHT METHOD
TOPOLOGY
TRAPPING
TRAPS
TWO-DIMENSIONAL CALCULATIONS