Ma, Y.Kim, Y.Kalugin, N.G.Lombardo, A.Ferrari, A.C.Kono, J.Imambekov, A.Smirnov, D.2017-06-062017-06-062014Ma, Y., Kim, Y., Kalugin, N.G., et al.. "Effects of electron-electron interactions on the electronic Raman scattering of graphite in high magnetic fields." <i>Physical Review B,</i> 89, no. 12 (2014) American Physical Society: https://doi.org/10.1103/PhysRevB.89.121402.https://hdl.handle.net/1911/94814We report the observation of strongly temperature (T)-dependent 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 3 to 1. 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 spectral line shape from (ω−Δ)−1/2 to (ω−Δ)2α−1/2 at T = 0. At finite T, we predict a thermal broadening factor that increases linearly with T. Our model reproduces the observed T-dependent line shape, determining the electron-electron interaction parameter α to be ∼0.05 at 40 T.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttps://doi.org/10.1103/PhysRevB.89.121402