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Micro‐magneto‐Raman scattering spectroscopy is made use of to probe magneto‐phonon resonances (MPR) in suspended mono‐ to pentalayer graphene. MPR correspond to avoided crossings between zone‐center optical phonons (G‐mode) and optically active inter‐Landau level (LL) transitions and provide a tool to perform LL spectroscopy at a fixed energy (≈197 meV) set by the G‐mode phonon. Using a single‐particle effective bilayer model, the velocity parameter associated with each MPR is readily extracted. A single velocity parameter slightly above the bulk graphite value suffices to fit all MPR for  N  ≥ 2 layer systems. In contrast, in monolayer graphene, it is found that the velocity parameter increases significantly from (1.23 ± 0.01) × 10 6  m s −1  up to (1.45 ± 0.02) × 10 6  m s −1  as the first to third optically active inter‐LL transitions couple to the G‐mode phonon. This result is understood as a signature of enhanced many‐body effects in unscreened graphene.

Many‐Body Effects in Suspended Graphene Probed through Magneto‐Phonon Resonances