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Finite-momentum dimer bound state in a spin-orbit-coupled Fermi gas
Physical Review A. Atomic, Molecular, and Optical Physics
We investigate the two-body properties of a spin-1/2 Fermi gas subject to a spin-orbit coupling induced by laser fields. When an attractive s-wave interaction between unlike spins is present, the system may form a dimer bound state. Surprisingly, in the presence of a Zeeman field along the direction of the spin-orbit coupling, the bound state obtains finite center-of-mass mechanical momentum, whereas under the same condition but in the absence of the two-body interaction, the system has zerodoi:10.1103/physreva.87.043616 fatcat:46crdxqjhvan5ouz3nttvhlbiu