Anomalous Landau levels and quantum oscillation in rotation-invariant insulators
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915956519862272 |
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| author | Fu, Jianlong Weng, Chun Yu Po, Hoi Chun |
| author_facet | Fu, Jianlong Weng, Chun Yu Po, Hoi Chun |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_16792 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anomalous Landau levels and quantum oscillation in rotation-invariant insulators Fu, Jianlong Weng, Chun Yu Po, Hoi Chun Strongly Correlated Electrons 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. |
| title | Anomalous Landau levels and quantum oscillation in rotation-invariant insulators |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2501.16792 |