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Broken symmetry in ideal Chern bands
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0009-0009-4988-9561
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Number of Authors: 52025 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 111, no 20, article id L201105Article in journal (Refereed) Published
Abstract [en]

Recent observations of the fractional anomalous quantum Hall effect in moiré materials have reignited the interest in fractional Chern insulators (FCIs). The chiral limit in which analytic Landau-level-like single-particle states form an "ideal"Chern band and local interactions lead to Laughlin-like FCIs at 1/3 filling has been very useful for understanding these systems by relating them to the lowest Landau level. We show, however, that, even in the idealized chiral limit, a fluctuating quantum geometry is associated with strongly broken symmetries and a phenomenology very different from that of Landau levels. In particular, particle-hole symmetry is strongly violated and, e.g., at 2/3 filling an emergent interaction driven Fermi liquid state with no Landau level counterpart is energetically favored. In fact, even the exact Laughlin-like zero modes at 1/3 filling have a nonuniform density tracking the underlying quantum geometry. Switching to a Coulomb interaction, the ideal Chern band with electron filling of 1/4 features trivial charge density wave states. Moreover, applying a particle-hole transformation reveals that the ideal Chern band with hole filling of 3/4 supports a quantum anomalous Hall crystal with quantized Hall conductance of e2/h. These phenomena have no direct lowest Landau level counterpart.

Place, publisher, year, edition, pages
2025. Vol. 111, no 20, article id L201105
National Category
Condensed Matter Physics
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URN: urn:nbn:se:su:diva-244016DOI: 10.1103/PhysRevB.111.L201105ISI: 001492237600002Scopus ID: 2-s2.0-105005261746OAI: oai:DiVA.org:su-244016DiVA, id: diva2:1966589
Available from: 2025-06-10 Created: 2025-06-10 Last updated: 2025-06-10Bibliographically approved

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Liu, HuiJohansson Bergholtz, Emil

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