Obstructed Atomic Insulators and Superfluids of Fermions Coupled to $\mathbb{Z}_2$ Gauge Fields
Abstract
We study spin- fermions coupled to gauge fields on a lattice. We show how a spatial modulation of the fermion hopping allows for the realization of various obstructed atomic insulators that host higher-order band topology. Studying the effect of quantum dynamics of the gauge fields within a simplified model, we find a rich phase diagram of this system with a number of superfluid phases arising from the attractive interactions meditated by the gauge fields. A key finding of this work is that the evolution from the Bardeen-Cooper-Schrieffer (BCS) superfluid state to a Bose-Einstein condensate (BEC) of tightly bound pairs occurs via the realization of these different superfluid phases separated by first-order transitions.
Keywords
Cite
@article{arxiv.2212.14625,
title = {Obstructed Atomic Insulators and Superfluids of Fermions Coupled to $\mathbb{Z}_2$ Gauge Fields},
author = {Bhandaru Phani Parasar and Vijay B. Shenoy},
journal= {arXiv preprint arXiv:2212.14625},
year = {2023}
}
Comments
7 pages, 4 figures, 1 table, supplemental material (6 pages, 1 figure)