Obstructed atomic insulators and superfluids of fermions coupled to Z2 gauge fields

Parasar, BP and Shenoy, VB (2023) Obstructed atomic insulators and superfluids of fermions coupled to Z2 gauge fields. In: Physical Review B, 107 (24).

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Abstract

Studying spin-12 fermions coupled to Z2 gauge fields on the square lattice, we show how a spatial modulation of the fermion hopping amplitude allows for the realization of various obstructed atomic insulators that host higher-order band topology. Including 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 (which host distinct types of topological defects) arising from the attractive interactions meditated by the gauge fields. The evolution of the superfluid obtained by the destabilization of the obstructed atomic insulators from the Bardeen-Cooper-Schrieffer (BCS) type to a Bose-Einstein condensate (BEC) of tightly bound pairs occurs via the realization of these different superfluid phases separated by first-order transitions.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the American Physical Society
Keywords:	Atoms; Bose-Einstein condensation; Gages; Statistical mechanics, Fermion hopping; Gauge fields; High-order; Higher-order; Hopping amplitude; Order bands; Quantum dynamics; Spatial modulations; Square lattices; Superfluid phasis, Topology
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	25 Jul 2023 04:58
Last Modified:	25 Jul 2023 04:58
URI:	https://eprints.iisc.ac.in/id/eprint/82583

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