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29 March 2024
 
  » arxiv » 1211.1700

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Finite-Momentum Dimer Bound State in Spin-Orbit Coupled Fermi Gas
Lin Dong ; Lei Jiang ; Hui Hu ; Han Pu ;
Date 7 Nov 2012
AbstractWe investigate the two-body properties of a spin-1/2 Fermi gas subject to a spin-orbit coupling induced by laser fields. When attractive s-wave interaction between unlike spins is present, the system may form a dimer bound state. Surprisingly, under proper conditions, the bound state obtains finite center-of-mass momentum, whereas under the same condition but in the absence of the two-body interaction, the system has zero total momentum. This unusual result can be regarded as a consequence of the broken Galilean invariance by the spin-orbit coupling. Such a finite-momentum bound state will have profound effects on the many-body properties of the system.
Source arXiv, 1211.1700
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