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.
Authors
R. Krishna Kumar
P. Kumaravadivel
A. K. Geim
LAURENCE EAVES laurence.eaves@nottingham.ac.uk
Research Professor
Abstract
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.
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
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 10, 2019 |
Online Publication Date | Oct 10, 2019 |
Publication Date | Oct 15, 2019 |
Deposit Date | Oct 21, 2019 |
Publicly Available Date | Nov 1, 2019 |
Journal | Physical Review B |
Print ISSN | 2469-9950 |
Electronic ISSN | 2469-9969 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 100 |
Issue | 15 |
Article Number | 155120 |
DOI | https://doi.org/10.1103/physrevb.100.155120 |
Public URL | https://nottingham-repository.worktribe.com/output/2891296 |
Publisher URL | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.155120 |
Files
PhysRevB.100.155120-2
(818 Kb)
PDF
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