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|Title:||Strong magnetophonon resonance induced triple G-mode splitting in graphene on graphite probed by micromagneto Raman spectroscopy|
|Source:||Qiu, C., Shen, X., Cao, B., Cong, C., Saito, R., Yu, J., Dresselhaus, M.S., Yu, T. (2013-10-10). Strong magnetophonon resonance induced triple G-mode splitting in graphene on graphite probed by micromagneto Raman spectroscopy. Physical Review B - Condensed Matter and Materials Physics 88 (16) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.88.165407|
|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-, Gi, and G+, 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+ and G- and can be well described by the two coupled mode model and (ii) the magnetic field-dependent oscillation of the Gi band, which is currently explained by the G band of graphite modified by the interaction with G+ and G-. 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. © 2013 American Physical Society.|
|Source Title:||Physical Review B - Condensed Matter and Materials Physics|
|Appears in Collections:||Staff Publications|
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