M. T. Greenaway
Magnetophonon spectroscopy of Dirac fermion scattering by transverse and longitudinal acoustic phonons in graphene
Greenaway, M. T.; Krishna Kumar, R.; Kumaravadivel, P.; Geim, A. K.; Eaves, L.
R. Krishna Kumar
A. K. Geim
Recently observed magnetophonon resonances in the magnetoresistance of graphene are investigated using the Kubo formalism. This analysis provides a quantitative fit to the magnetophonon resonances over a wide range of carrier densities. It demonstrates the predominance of carrier scattering by low-energy transverse acoustic (TA) mode phonons: the magnetophonon resonance amplitude is significantly stronger for the TA modes than for the longitudinal acoustic (LA) modes. We demonstrate that the LA and TA phonon speeds and the electron-phonon coupling strengths determined from the magnetophonon resonance measurements also provide an excellent fit to the measured dependence of the resistivity at zero magnetic field over a temperature range of 4-150 K. A semiclassical description of magnetophonon resonance in graphene is shown to provide a simple physical explanation for the dependence of the magneto-oscillation period on carrier density. The correspondence between the quantum calculation and the semiclassical model is discussed.
|Journal Article Type||Article|
|Publication Date||Oct 15, 2019|
|Journal||Physical Review B|
|Publisher||American Physical Society|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Greenaway, M. T., Krishna Kumar, R., Kumaravadivel, P., Geim, A. K., & Eaves, L. (2019). Magnetophonon spectroscopy of Dirac fermion scattering by transverse and longitudinal acoustic phonons in graphene. Physical Review B, 100(15), https://doi.org/10.1103/physrevb.100.155120|
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