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arXiv · 1304.5415

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

Y. Ma·Y. Kim·N. G. Kalugin·A. Lombardo·A. C. Ferrari·J. Kono·A. Imambekov·D. Smirnov
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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 $(ω-Δ)^{2α-1/2}$ 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 $α$ to be $\sim$0.05 at 40 T.

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Y. Ma, Y. Kim, N. G. Kalugin, A. Lombardo, A. C. Ferrari, J. Kono, A. Imambekov, D. Smirnov. 2013-04-19. Effects of Electron-Electron Interactions on Electronic Raman Scattering of Graphite in High Magnetic Fields. https://doi.org/10.1103/physrevb.89.121402

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