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Fractional quantum Hall states with gapped boundaries in an extreme lattice limit
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-9739-2930
Number of Authors: 22019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 19, article id 195122Article in journal (Refereed) Published
Abstract [en]

We present a detailed microscopic investigation of fractional quantum Hall states with gapped boundaries in a coupled bilayer lattice model featuring holes whose counterpropagating chiral edge states are hybridized and gapped out. We focus on an lattice limit for cold-atom experiments, in which each hole just consists of a single removed site. Although the holes distort the original band structure and lead to in-gap remnants of the continuum edge modes, we find that the lowest nearly flat band representing a higher-genus system may naturally form by controlling the local hopping terms that gap out the boundaries. Remarkably, local interactions in this new flat band lead to various Abelian and non-Abelian fractional quantum Hall states with gapped boundaries residing on emergent higher-genus surfaces, which we identify by extracting the nontrivial topological ground-state degeneracies and the fractional statistics of quasiparticles. These results demonstrate the feasibility of realizing novel fractional quantum Hall states with gapped boundaries even in the extreme lattice limit, thus enabling a possible new route towards universal topological quantum computation.

Place, publisher, year, edition, pages
2019. Vol. 99, no 19, article id 195122
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-170190DOI: 10.1103/PhysRevB.99.195122ISI: 000467726100002OAI: oai:DiVA.org:su-170190DiVA, id: diva2:1338073
Available from: 2019-07-19 Created: 2019-07-19 Last updated: 2019-07-19Bibliographically approved

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