Effects of Electron-Electron Interactions on Electronic Raman Scattering of Graphite in High Magnetic Fields

Abstract

We report the observation of strongly temperature-dependent, asymmetric spectral lines in electronic Raman scattering spectra of graphite in a high magnetic field up to 45 T applied along the c-axis. The magnetic field quantizes the in-plane motion, while the out-of-plane motion remains free, effectively reducing the system dimension from three to one. Optically created electron-hole pairs interact with, or shake up, the one-dimensional Fermi sea in the lowest Landau subbands. Based on the Tomonaga-Luttinger liquid theory, we show that interaction effects modify the van Hove singularity to the form $(\omega -\Delta {)}^{2\alpha -1/2}$ at zero temperature. At finite temperature, we predict a thermal broadening factor that increases linearly with the temperature. Our model reproduces the observed temperature-dependent line-shape, determining $\alpha$ to be $\sim$0.05 at 40 T.

5 pages, 3 figures

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Cited by in corpus (2)

• Probing electronic excitations in mono- to pentalayer graphene by micro-magneto-Raman spectroscopy
• Raman scattering of graphene based systems in high magnetic fields