Probing quantum geometry through optical conductivity and magnetic circular dichroism
Name
sciadv.ado1761.pdf
Description
Published version
Size
1.41 MB
Format
Adobe PDF
Checksum (MD5)
bf3682e5e8e56933c782d44350c60037
Author(s)
Ghosh, Barun
Onishi, Yugo
Xu, Su-Yang
Lin, Hsin
Fu, Liang
Bansil, Arun
Date Issued
December 20, 2024
Journal
Science Advances
Publisher
American Association for the Advancement of Science
Citation
Barun Ghosh et al., Probing quantum geometry through optical conductivity and magnetic circular dichroism.Sci. Adv. 10,eado1761 (2024).
Version
Final published version
Abstract
Probing ground-state quantum geometry and topology through optical responses is not only of fundamental interest, but it can also offer several practical advantages. Here, using first-principles calculations on thin films of the antiferromagnetic topological insulator MnBi2Te4, we demonstrate how the generalized optical weight arising from the absorptive part of the optical conductivity can be used to probe the ground-state quantum geometry and topology. We show that three-septuple-layer MnBi2Te4 film exhibit an enhanced, almost-perfect magnetic circular dichroism for a narrow photon energy window in the infrared region. We calculate the quantum weight in this MnBi2Te4 film and show that it far exceeds the lower bound provided by the Chern number. Our results suggest that the well-known optical methods are powerful tools for probing the ground-state quantum geometry and topology.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1126/sciadv.ado1761
