Lianyi He, Xu-Guang Huang
We present a systematic theoretical study of the BCS-BEC crossover problem in
3D atomic Fermi gases at zero temperature with a spherical spin-orbit coupling
which can be realized by a synthetic non-Abelian gauge field coupled to
fermions. Our investigations are based on the path integral formalism which is
a powerful theoretical scheme for the study of the properties of bound state,
the superfluid ground state, and the collective excitations in the BCS-BEC
crossover. At large spin-orbit coupling, the system enters the BEC state of a
novel type of bound state (referred to as rashbon) which possesses a
non-trivial effective mass. Analytical results and interesting universal
behaviors for various physical quantities at large spin-orbit coupling are
obtained. Our theoretical predictions can be tested in future experiments of
cold Fermi gases with 3D spherical spin-orbit coupling.
View original:
http://arxiv.org/abs/1202.1492
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