Unraveling the interlayer-related phonon self-energy renormalization in bilayer graphene
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Kong_Unraveling the.pdf
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Author(s)
Araujo, Paulo Antonio Trinidade
Mafra, Daniela Lopes
Sato, Kentaro
Saito, Riichiro
Kong, Jing
Dresselhaus, Mildred
Date Issued
December 2012
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Araujo, Paulo T., Daniela L. Mafra, Kentaro Sato, Riichiro Saito, Jing Kong, and Mildred S. Dresselhaus. “Unraveling the Interlayer-Related Phonon Self-Energy Renormalization in Bilayer Graphene.” Sci. Rep. 2 (December 21, 2012).
Version
Final published version
Abstract
In this letter, we present a step towards understanding the bilayer graphene (2LG) interlayer (IL)-related phonon combination modes and overtones as well as their phonon self-energy renormalizations by using both gate-modulated and laser-energy dependent inelastic scattering spectroscopy. We show that although the IL interactions are weak, their respective phonon renormalization response is significant. Particularly special, the IL interactions are mediated by Van der Waals forces and are fundamental for understanding low-energy phenomena such as transport and infrared optics. Our approach opens up a new route to understanding fundamental properties of IL interactions which can be extended to any graphene-like material, such as MoS2, WSe2, oxides and hydroxides. Furthermore, we report a previously elusive crossing between IL-related phonon combination modes in 2LG, which might have important technological applications.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License
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DOI of Published Version
https://doi.org/10.1038/srep01017
