Fundamental Bound on Topological Gap

Author(s)
Onishi, Yugo; Fu, Liang
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Abstract
We provide a universal tight bound on the energy gap of topological insulators by exploring relationships between topology, quantum geometry, and optical absorption. Applications of our theory to infrared absorption near topological band inversion, magnetic circular dichroism in Chern insulators, and topological gap in moiré materials are demonstrated.
Date issued
2024-03-21
URI
https://hdl.handle.net/1721.1/155169
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review X
Publisher
American Physical Society
Citation
Onishi, Yugo and Fu, Liang. 2024. "Fundamental Bound on Topological Gap." Physical Review X, 14 (1).
Version: Final published version
ISSN
2160-3308
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