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arXiv · 2501.16792

Anomalous Landau levels and quantum oscillation in rotation-invariant insulators

Jianlong Fu·Chun Yu Weng·Hoi Chun Po
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Abstract

Landau levels in certain models are known to protrude into the zero-field energy gap. These are known as anomalous Landau levels (ALLs). We study whether ALLs can lead to Fermi-surface like quantum oscillation in the absence of a zero-field Fermi surface. Focusing on two-dimensional multi-band low-energy models of electrons with continuous rotation symmetry, we show that an effective-band description, akin to the semiclassical treatment of Landau level problems in metals, can be used to predict the Landau level spectrum, including possible ALLs. This description then describes ALL induced quantum oscillation for certain insulating models, which we demonstrate through numerical calculations.

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Jianlong Fu, Chun Yu Weng, Hoi Chun Po. 2025-01-28. Anomalous Landau levels and quantum oscillation in rotation-invariant insulators. https://doi.org/10.1038/s41535-026-00867-7

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