Electronic excitations and electron-phonon coupling in bulk graphite through Raman scattering in high magnetic fields

We use polarized magneto-Raman scattering to study purely electronic excitations and the electron-phonon coupling in bulk graphite. At a temperature of 4.2 K and in magnetic fields up to 28 T we observe \(K\)-point electronic excitations involving Landau bands with \(\Delta |n|=0\) and with \(\Delta...

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Bibliographic Details
Published in:arXiv.org 2011-10
Main Authors: Kossacki, P, Faugeras, C, Kühne, M, Orlita, M, Nicolet, A A L, Schneider, J M, Basko, D M, Latyshev, Y I, Potemski, M
Format: Article
Language:English
Subjects:
Angular momentum
Coupling
Electrons
Excitation
Graphite
Holes (electron deficiencies)
Magnetic fields
Phonons
Raman spectra
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Summary:We use polarized magneto-Raman scattering to study purely electronic excitations and the electron-phonon coupling in bulk graphite. At a temperature of 4.2 K and in magnetic fields up to 28 T we observe \(K\)-point electronic excitations involving Landau bands with \(\Delta |n|=0\) and with \(\Delta |n|=\pm2\) that can be selected by controlling the angular momentum of the excitation laser and of the scattered light. The magneto-phonon effect involving the \(E_{2g}\) optical phonon and \(K\)-point inter Landau bands electronic excitations with \(\Delta |n|=\pm1\) is revealed and analyzed within a model taking into account the full \(k_z\) dispersion. These polarization resolved results are explained in the frame of the Slonczewski-Weiss-McClure (SWM) model which directly allows to quantify the electron-hole asymmetry.
ISSN:2331-8422
DOI:10.48550/arxiv.1110.4262