Journal article
Exciton band topology in spontaneous quantum anomalous Hall insulators: applications to twisted bilayer graphene
- Abstract:
- We uncover topological features of neutral particle-hole pair excitations of correlated quantum anomalous Hall (QAH) insulators whose approximately flat conduction and valence bands have equal and opposite nonzero Chern number. Using an exactly solvable model we show that the underlying band topology affects both the center-of-mass and relative motion of particle-hole bound states. This leads to the formation of topological exciton bands whose features are robust to nonuniformity of both the dispersion and the Berry curvature. We apply these ideas to recently reported broken-symmetry spontaneous QAH insulators in substrate aligned magic-angle twisted bilayer graphene.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, 418.2KB, Terms of use)
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- Publisher copy:
- 10.1103/PhysRevLett.126.137601
Authors
- Publisher:
- American Physical Society
- Journal:
- Physical Review Letters More from this journal
- Volume:
- 126
- Issue:
- 13
- Article number:
- 137601
- Publication date:
- 2021-03-30
- Acceptance date:
- 2021-02-17
- DOI:
- EISSN:
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1079-7114
- ISSN:
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0031-9007
- Language:
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English
- Keywords:
- Pubs id:
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1138077
- Local pid:
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pubs:1138077
- Deposit date:
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2021-02-19
Terms of use
- Copyright holder:
- American Physical Society
- Copyright date:
- 2021
- Rights statement:
- © 2021 American Physical Society.
- Notes:
- This is the publisher's version of the article. The final version is available online from the American Physical Society at: https://doi.org/10.1103/PhysRevLett.126.137601
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