PhysRevB.100.155120.pdf (799.19 kB)
Magnetophonon spectroscopy of Dirac fermion scattering by transverse and longitudinal acoustic phonons in graphene
journal contribution
posted on 2019-10-15, 08:45 authored by Mark GreenawayMark Greenaway, R Krishna Kumar, P Kumaravadivel, A.K. Geim, L EavesRecently 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.
Funding
Engineering and Physical Sciences Research Council (EPSRC),
Graphene Flagship
the Royal Society
Lloyd’s Register Foundation
History
School
- Science
Department
- Physics
Published in
Physical Review BVolume
100Publisher
American Physical Society (APS)Version
- VoR (Version of Record)
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© the American Physical SocietyPublisher statement
This paper was accepted for publication in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/physrevb.100.155120Publication date
2019-10-10Copyright date
2019ISSN
2469-9950eISSN
2469-9969Publisher version
Language
- en
Depositor
Dr Mark GreenawayArticle number
155120Usage metrics
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