Evidence for an atomic chiral superfluid with topological excitations.

ABSTRACT: Topological superfluidity is an important concept in electronic materials as well as ultracold atomic gases¹. However, although progress has been made by hybridizing superconductors with topological substrates, the search for a material-natural or artificial-that intrinsically exhibits topological superfluidity has been ongoing since the discovery of the superfluid ³He-A phase². Here we report evidence for a globally chiral atomic superfluid, induced by interaction-driven time-reversal symmetry breaking in the second Bloch band of an optical lattice with hexagonal boron nitride geometry. This realizes a long-lived Bose-Einstein condensate of ⁸⁷Rb atoms beyond present limits to orbitally featureless scenarios in the lowest Bloch band. Time-of-flig

SUBMITTER: Wang XQ 

PROVIDER: S-EPMC8357630 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature