|报告题目||Vortex in a Fermi Superfluid under Spin-Angular-Momentum Coupling|
|报告时间||2021-01-08 (周五) 10:00|
Abstract:：Vortices in Fermi superfluids are conventionally induced by Abelian gauge fields. Here we demonstrate how a synthetic, non-Abelian gauge field, namely the spin-orbital-angular-momentum (SOAM) coupling, generates vortices in a Fermi superfluid. The mechanism of the vortex formation can be viewed as the angular analogue to that of the spin-orbit-coupling-induced Fulde-Ferrell state under a Fermi surface deformation. Remarkably, the vortex size is comparable with the beam waist of Raman lasers generating the SOAM coupling, which is typically much larger than previously observed vortices in Fermi superfluids. With tunable size and core structure, these giant vortex states would provide unprecedented experimental access to topological defects in Fermi superfluids.