Topological superfluidity with repulsive alkaline-earth atoms in optical lattices

Author
Abstract
We discuss a realization of topological superfluidity with fermionic atoms in an optical lattice. We consider a situation where atoms in two internal states experience different lattice potentials: one species is localized and the other itinerant, and show how quantum fluctuations of the localized fermions give rise to an attraction and spin-orbit coupling in the itinerant band. At low temperature, these effects stabilize a topological superfluid of mobile atoms even if their bare interactions are repulsive. This emergent state can be engineered with alkaline-earth atoms in a superlattice with a dimerized unit cell. To probe its unique properties we describe protocols that use high spectral resolution and controllability of a narrow clock transition, such as momentum-resolved spectroscopy and supercurrent response to a synthetic (laser-induced) magnetic field.
Year of Publication
2019
Journal
New Journal of Physics
Volume
21
Number of Pages
073049
Date Published
2019-07
URL
https://iopscience.iop.org/article/10.1088/1367-2630/ab2ee0/meta
DOI
10.1088/1367-2630/ab2ee0
JILA PI
Journal Article