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Generating Giant Vortex in a Fermi Superfluid via Spin-Orbital-Angular-Momentum Coupling

Authors :
Chen, Ke-Ji
Wu, Fan
Peng, Shi-Guo
Yi, Wei
He, Lianyi
Source :
Phys. Rev. Lett. 125, 260407 (2020)
Publication Year :
2020

Abstract

Spin-orbital-angular-momentum (SOAM) coupling has been realized in recent experiments of Bose-Einstein condensates [Chen et al., Phys. Rev. Lett. 121, 113204 (2018) and Zhang et al., Phys. Rev. Lett. 122, 110402 (2019)], where the orbital angular momentum imprinted upon bosons leads to quantized vortices. For fermions, such an exotic synthetic gauge field can provide fertile ground for fascinating pairing schemes and rich superfluid phases, which are yet to be explored. Here we demonstrate how SOAM coupling stabilizes vortices in Fermi superfluids through a unique mechanism that can be viewed as the angular analog 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 provide unprecedented experimental access to topological defects in Fermi superfluids.<br />Comment: 6+5 pages, 5+5 figures

Details

Database :
arXiv
Journal :
Phys. Rev. Lett. 125, 260407 (2020)
Publication Type :
Report
Accession number :
edsarx.2006.08898
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevLett.125.260407