Intra-Landau level Cyclotron Resonance in Bilayer Graphene

TL;DR

This paper predicts intra-Landau-level cyclotron resonance signals and collective modes in bilayer graphene, revealing new quantum Hall effects and potential localization phenomena driven by electron interactions.

Contribution

It introduces the prediction of intra-Landau-level cyclotron resonance and associated collective modes in bilayer graphene, a novel phenomenon not previously described.

Findings

Resonance signals at odd-integer filling factors

Nearly gapless collective modes with $k^{3/2}$ dispersion

Potential for unusual localization physics

Abstract

Interaction driven integer quantum Hall effects are anticipated in graphene bilayers because of the near-degeneracy of the eight Landau levels which appear near the neutral system Fermi level. We predict that an intra-Landau-level cyclotron resonance signal will appear at some odd-integer filling factors, accompanied by collective modes which are nearly gapless and have approximate $k^{3/2}$ dispersion. We speculate on the possibility of unususal localization physics associated with these modes.