# Landau Level Spectroscopy of Electron-Electron Interactions in Graphene

 Title: Landau Level Spectroscopy of Electron-Electron Interactions in Graphene Author: Faugeras, C.; Berciaud, S.; Leszczynski, P.; Henni, Y.; Nogajewski, K.; Orlita, M.; Taniguchi, T.; Watanabe, K.; Forsythe, C.; Kim, Philip; Jalil, R.; Geim, A. K.; Basko, D. M.; Potemski, M. Note: Order does not necessarily reflect citation order of authors. Citation: Faugeras, C., S. Berciaud, P. Leszczynski, Y. Henni, K. Nogajewski, M. Orlita, T. Taniguchi, et al. 2015. “Landau Level Spectroscopy of Electron-Electron Interactions in Graphene.” Physical Review Letters 114 (12) (March 27). doi:10.1103/physrevlett.114.126804. Full Text & Related Files: 76413509.pdf (477.8Kb; PDF) Abstract: We present magneto-Raman scattering studies of electronic inter-Landau level excitations in quasineutral graphene samples with different strengths of Coulomb interaction. The band velocity associated with these excitations is found to depend on the dielectric environment, on the index of Landau level involved, and to vary as a function of the magnetic field. This contradicts the single-particle picture of noninteracting massless Dirac electrons but is accounted for by theory when the effect of electron-electron interaction is taken into account. Raman active, zero-momentum inter-Landau level excitations in graphene are sensitive to electron-electron interactions due to the nonapplicability of the Kohn theorem in this system, with a clearly nonparabolic dispersion relation. Published Version: doi:10.1103/PhysRevLett.114.126804 Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:30781093 Downloads of this work: