Mass-related inversion symmetry breaking and phonon self-energy renormalization in isotopically labeled AB-stacked bilayer graphene
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Kong_Mass-related.pdf
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Author(s)
Araujo, Paulo Antonio Trinidade
Frank, Otakar
Mafra, Daniela Lopes
Fang, Wenjing
Kong, Jing
Dresselhaus, Mildred
Kalbac, Martin
Date Issued
June 2013
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Araujo, Paulo T., Otakar Frank, Daniela L. Mafra, Wenjing Fang, Jing Kong, Mildred S. Dresselhaus, and Martin Kalbac. “Mass-Related Inversion Symmetry Breaking and Phonon Self-Energy Renormalization in Isotopically Labeled AB-Stacked Bilayer Graphene.” Sci. Rep. 3 (June 24, 2013).
Version
Final published version
Abstract
A mass-related symmetry breaking in isotopically labeled bilayer graphene (2LG) was investigated during in-situ electrochemical charging of AB stacked (AB-2LG) and turbostratic (t-2LG) layers. The overlap of the two approaches, isotopic labeling and electronic doping, is powerful tool and allows to tailor, independently and distinctly, the thermal-related and transport-related phenomena in materials, since one can impose different symmetries for electrons and phonons in these systems. Variations in the system's phonon self-energy renormalizations due to the charge distribution and doping changes could be analyzed separately for each individual layer. Symmetry arguments together with first-order Raman spectra show that the single layer graphene (1LG), which is directly contacted to the electrode, has a higher concentration of charge carriers than the second graphene layer, which is not contacted by the electrode. These different charge distributions are reflected and demonstrated by different phonon self-energy renormalizations of the G modes for AB-2LG and for t-2LG.
MIT Department
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Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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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/srep02061
