Magic of high-order van Hove singularity
Name
s41467-019-13670-9.pdf
Description
Published version
Size
882.36 KB
Format
Adobe PDF
Checksum (MD5)
529dc7843f950cf675fbb4f217e1c8ab
Author(s)
Yuan, Noah F. Q.
Isobe, Hiroki
Fu, Liang
Date Issued
December 2019
Journal
Nature Communications
Publisher
Springer Science and Business Media
Citation
Yuan, Noah F. Q. et al. "Magic of high-order van Hove singularity." Nature Communications 10, 1 (December 2019): 5769 © 2019 The Author(s)
Version
Final published version
Abstract
The van Hove singularity in density of states generally exists in periodic systems due to the presence of saddle points of energy dispersion in momentum space. We introduce a new type of van Hove singularity in two dimensions, resulting from high-order saddle points and exhibiting power-law divergent density of states. We show that high-order van Hove singularity can be generally achieved by tuning the band structure with a single parameter in moiré superlattices, such as twisted bilayer graphene by tuning twist angle or applying pressure, and trilayer graphene by applying vertical electric field. Correlation effects from high-order van Hove singularity near Fermi level are also discussed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/s41467-019-13670-9
