%0 Journal Article
%J Physical Review A
%D 2014
%T Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap
%A Lei Jiang
%A Eite Tiesinga
%A Xia-Ji Liu
%A Hui Hu
%A Han Pu
%X Motivated by recent experimental breakthroughs in generating spin-orbit coupling in ultracold Fermi gases using Raman laser beams, we present a systematic study of spin-orbit-coupled Fermi gases confined in a quasi-one-dimensional trap in the presence of an in-plane Zeeman field (which can be realized using a finite two-photon Raman detuning). We find that a topological Fulde-Ferrell state will emerge, featuring finite-momentum Cooper pairing and zero-energy Majorana excitations localized near the edge of the trap based on the self-consistent Bogoliubov-de Genes (BdG) equations. We find analytically the wavefunctions of the Majorana modes. Finally using the time-dependent BdG we show how the finite-momentum pairing field manifests itself in the expansion dynamics of the atomic cloud.
%B Physical Review A
%V 90
%8 2014/11/7
%G eng
%U http://arxiv.org/abs/1404.6211v1
%N 5
%! Phys. Rev. A
%R 10.1103/PhysRevA.90.053606