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.
Highlights
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
An effective velocity associated with each inter-LL transition is not a single value but (i) depends on the dielectric environment, the departure from the noninteracting picture being most pronounced for suspended graphene, weaker for graphene encapsulated in hexagonal boron nitride, and rather small for graphene on graphite, (ii) varies logarithmically with the magnetic field, and (iii) is higher for transitions involving higher LLs
We studied three distinct graphene systems: suspended graphene (G-S), graphene encapsulated in hexagonal boron nitride (G-BN), and graphene on graphite (G-Gr)
Summary
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.
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