01304nas a2200169 4500008004100000245009000041210006900131260001400200490000700214520080200221100001501023700001901038700001601057700001201073700001201085856003701097 2014 eng d00aSpin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap
0 aSpinorbitcoupled topological FuldeFerrell states of fermions in c2014/11/70 v903 a 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.
1 aJiang, Lei1 aTiesinga, Eite1 aLiu, Xia-Ji1 aHu, Hui1 aPu, Han uhttp://arxiv.org/abs/1404.6211v1