Strong magnetophonon resonance induced triple G-mode splitting in graphene on graphite probed by micromagneto Raman spectroscopy
Name
Qiu-2013-Strong magnetophonon resonance.pdf
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5.89 MB
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Author(s)
Qiu, Caiyu
Shen, Xiaonan
Cao, Bingchen
Cong, Chunxiao
Saito, Riichiro
Yu, Jingjiang
Yu, Ting
Dresselhaus, Mildred
Date Issued
October 2013
Journal
Physical Review B
Publisher
American Physical Society
Citation
Qiu, Caiyu, Xiaonan Shen, Bingchen Cao, Chunxiao Cong, Riichiro Saito, Jingjiang Yu, Mildred S. Dresselhaus, and Ting Yu. “Strong Magnetophonon Resonance Induced Triple G-Mode Splitting in Graphene on Graphite Probed by Micromagneto Raman Spectroscopy.” Phys. Rev. B 88, no. 16 (October 2013). © 2013 American Physical Society
Version
Final published version
Abstract
The resonance between the G-band phonon excitation and Landau level optical transitions in graphene has been systematically studied by micromagneto Raman mapping. In purely decoupled graphene regions on a graphite substrate, eight traces of anticrossing spectral features with G-mode peaks are observed as a function of magnetic fields up to 9 T, and these traces correspond to either symmetric or asymmetric Landau level transitions. Three distinct split peaks of the G mode, named G[subscript −], G[subscript i], and G[subscript +], are observed at the strong magnetophonon resonance condition corresponding to a magnetic field of ∼4.65 T. These three special modes are attributed to (i) the coupling between the G phonon and the magneto-optical transitions, which is responsible for G[subscript +] and G[subscript −] and can be well described by the two coupled mode model and (ii) the magnetic field-dependent oscillation of the G[subscript i] band, which is currently explained by the G band of graphite modified by the interaction with G[subscript +] and G[subscript −]. The pronounced interaction between Dirac fermions and phonons demonstrates a dramatically small Landau level width (∼1.3 meV), which is a signature of the ultrahigh quality graphene obtained on the surface of graphite.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.88.165407
