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• W3192432744 abstract "Abstract Topological superfluidity is an important concept in electronic materials as well as ultracold atomic gases 1 . 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 3 He-A phase 2 . 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 87 Rb atoms beyond present limits to orbitally featureless scenarios in the lowest Bloch band. Time-of-flight and band mapping measurements reveal that the local phases and orbital rotations of atoms are spontaneously ordered into a vortex array, showing evidence of the emergence of global angular momentum across the entire lattice. A phenomenological effective model is used to capture the dynamics of Bogoliubov quasi-particle excitations above the ground state, which are shown to exhibit a topological band structure. The observed bosonic phase is expected to exhibit phenomena that are conceptually distinct from, but related to, the quantum anomalous Hall effect 3–7 in electronic condensed matter." @default.
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• W3192432744 date "2021-08-11" @default.
• W3192432744 modified "2023-09-28" @default.
• W3192432744 title "Evidence for an atomic chiral superfluid with topological excitations" @default.
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• W3192432744 doi "https://doi.org/10.1038/s41586-021-03702-0" @default.
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