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Non-Abelian Fractional Chern Insulators and Competing States in Flat Moiré Bands
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0009-0009-4988-9561
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-9739-2930
Number of Authors: 32025 (English)In: Physical review letters, Vol. 135, no 10, article id 106604Article in journal (Refereed) Published
Abstract [en]

Breakthrough experiments have recently realized fractional Chern insulators (FCIs) in moiré materials. However, all states observed are Abelian; the possible existence of more exotic non-Abelian FCIs remains controversial both experimentally and theoretically. Here, we investigate the competition between charge density wave (CDW) order, gapless composite fermion liquid (CFL), and non-Abelian Moore-Read states at half filling of a moiré band. Although ground-state (quasi)degeneracies and spectral flow are not sufficient for distinguishing between charge order and Moore-Read states, we find evidence using entanglement spectroscopy that both these states of matter can be realized with Coulomb interactions. By further analyzing the graviton excitations of Moore-Read states, we unveil that the ground states exhibit a mixed behavior of Pfaffian and anti-Pfaffian, despite the weak breaking of particle-hole symmetry. In a double twisted bilayer graphene model, transitions between these phases can be driven by the coupling strength between the layers: at weak coupling there is a CFL phase and at strong coupling a CDW order emerges. Remarkably, however, there is compelling evidence for a non-Abelian Moore-Read FCI phase at intermediate coupling.

Place, publisher, year, edition, pages
2025. Vol. 135, no 10, article id 106604
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-247955DOI: 10.1103/43nq-ntqmISI: 001570575300003PubMedID: 40981573Scopus ID: 2-s2.0-105016768354OAI: oai:DiVA.org:su-247955DiVA, id: diva2:2005182
Available from: 2025-10-09 Created: 2025-10-09 Last updated: 2025-10-09Bibliographically approved

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Liu, HuiJohansson Bergholtz, Emil

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