Measurable signatures of bosonic fractional Chern insulator states and their fractional excitations in a quantum-gas microscope

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dc.contributor.authorWang, Botao
dc.contributor.authorDong, Xiao-Yu
dc.contributor.authorEckardt, André
dc.date.accessioned2022-10-31T10:03:19Z
dc.date.available2022-10-31T10:03:19Z
dc.date.issued2022-03-17
dc.description.abstractThe recent progress in engineering topological band structures in optical-lattice systems makes it promising to study fractional Chern insulator states in these systems. Here we consider a realistic finite system of a few repulsively interacting bosons on a square lattice with magnetic flux and sharp edges, as it can be realized in quantum-gas microscopes. We investigate under which conditions a fractional Chern insulator state corresponding to the Laughlin-like state at filling ν=1/2 can be stabilized and its fractional excitations probed. Using numerical simulations, we find an incompressible bulk density at the expected filling for systems, whose linear extent is as small as 6-8 sites. This is a promising result, since such small systems are favorable with respect to the required adiabatic state preparation. Moreover, we also see very clear signatures of excitations with fractional charge in response both to static pinning potentials and dynamical flux insertion. Since the compressible edges, which are found to feature chiral currents, can serve as a reservoir, these observations are robust against changes in the total particle number. Our results suggest that signatures of both a fractional Chern insulator state and its fractional excitations can be found under realistic experimental conditions.en
dc.description.sponsorshipDFG, 277974659, FOR 2414: Artificial Gauge Fields and Interacting Topological Phases in Ultracold Atoms
dc.description.sponsorshipEC/H2020/715861/EU/Entanglement and Renormalisation for Quantum Fields/ERQUAF
dc.description.sponsorshipTU Berlin, Open-Access-Mittel – 2022en
dc.identifier.eissn2542-4653
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/17604
dc.identifier.urihttps://doi.org/10.14279/depositonce-16387
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddc530 Physikde
dc.subject.otheroptical-lattice systemsen
dc.subject.otherfractional Chern insulator statesen
dc.subject.otherrepulsively interacting bosonsen
dc.subject.othersquare latticeen
dc.subject.otherquantum-gas microscopesen
dc.titleMeasurable signatures of bosonic fractional Chern insulator states and their fractional excitations in a quantum-gas microscopeen
dc.typeArticle
dc.type.versionpublishedVersion
dcterms.bibliographicCitation.articlenumber095
dcterms.bibliographicCitation.doi10.21468/SciPostPhys.12.3.095
dcterms.bibliographicCitation.issue3
dcterms.bibliographicCitation.journaltitleSciPost physics
dcterms.bibliographicCitation.originalpublishernameSciPost Foundation
dcterms.bibliographicCitation.originalpublisherplaceAmsterdam
dcterms.bibliographicCitation.volume12
tub.accessrights.dnbfree
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Theoretische Physik::FG Quantennichtgleichgewichtsdynamik
tub.publisher.universityorinstitutionTechnische Universität Berlin

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