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Title: Zone folding effect in Raman G-band intensity of twisted bilayer graphene
Authors: Sato, K.
Saito, R.
Cong, C.
Yu, T. 
Dresselhaus, M.S.
Issue Date: 7-Sep-2012
Citation: Sato, K., Saito, R., Cong, C., Yu, T., Dresselhaus, M.S. (2012-09-07). Zone folding effect in Raman G-band intensity of twisted bilayer graphene. Physical Review B - Condensed Matter and Materials Physics 86 (12) : -. ScholarBank@NUS Repository.
Abstract: The G-band Raman intensity is calculated for twisted bilayer graphene as a function of laser excitation energy based on the extended tight binding method. Here we explicitly consider the electron-photon and electron-phonon matrix elements of twisted bilayer graphene to calculate the resonance Raman intensity. The G-band Raman intensity is sensitive to the laser excitation energy and the twisting angle between the layers as a result of folding the electronic energy band structure. The Van Hove energy singularity, which is an electron transition energy between the conduction and valence bands, depends on n-m of the twisting vector (n,m). The relative intensity of the G band as a function of twisting vectors is presented, which should be useful for the experimental identification of the twisting angle. © 2012 American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.86.125414
Appears in Collections:Staff Publications

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