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    Evolution of the electronic band structure of twisted bilayer graphene upon doping

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    s41598-017-07580-3.pdf
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    Description:
    FInal Published Version
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    Author
    Huang, Shengqiang
    Yankowitz, Matthew
    Chattrakun, Kanokporn
    Sandhu, Arvinder
    LeRoy, Brian J. cc
    Affiliation
    Univ Arizona, Phys Dept
    Univ Arizona, Coll Opt Sci
    Issue Date
    2017-08-08
    
    Metadata
    Show full item record
    Publisher
    NATURE PUBLISHING GROUP
    Citation
    Evolution of the electronic band structure of twisted bilayer graphene upon doping 2017, 7 (1) Scientific Reports
    Journal
    Scientific Reports
    Rights
    © The Author(s) 2017. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The 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.
    ISSN
    2045-2322
    DOI
    10.1038/s41598-017-07580-3
    Version
    Final published version
    Sponsors
    NSF [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]
    Additional Links
    http://www.nature.com/articles/s41598-017-07580-3
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41598-017-07580-3
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