Evolution of the electronic band structure of twisted bilayer graphene upon doping
AffiliationUniv Arizona, Phys Dept
Univ Arizona, Coll Opt Sci
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationEvolution of the electronic band structure of twisted bilayer graphene upon doping 2017, 7 (1) Scientific Reports
Rights© The Author(s) 2017. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License.
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AbstractThe electronic band structure of twisted bilayer graphene develops van Hove singularities whose energy depends on the twist angle between the two layers. Using Raman spectroscopy, we monitor the evolution of the electronic band structure upon doping using the G peak area which is enhanced when the laser photon energy is resonant with the energy separation of the van Hove singularities. Upon charge doping, the Raman G peak area initially increases for twist angles larger than a critical angle and decreases for smaller angles. To explain this behavior with twist angle, the energy separation of the van Hove singularities must decrease with increasing charge density demonstrating the ability to modify the electronic and optical properties of twisted bilayer graphene with doping.
VersionFinal published version
SponsorsNSF [DMR-0953784, PHY-1505556]; U.S. Army Research Laboratory; U.S. Army Research Office [W911NF-09-0333, W911NF-12-1-0345, W911NF-14-1-0653]