Interaction-induced shift of the cyclotron resonance of graphene using infrared spectroscopy

Details Interaction-induced shift of the cyclotron resonance of graphene using infrared spectroscopy Interaction-induced shift of the cyclotron resonance of graphene using infrared spectroscopy

2009-10-23

arxiv.org/abs/0910.4575v2

PRL 104, 067404 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures. Version 2, edited for publication. Includes a number of edits for clarity; also added a paragraph contrast

Scientific paper

10.1103/PhysRevLett.104.067404

We report a study of the cyclotron resonance (CR) transitions to and from the unusual $n=0$ Landau level (LL) in monolayer graphene. Unexpectedly, we find the CR transition energy exhibits large (up to 10%) and non-monotonic shifts as a function of the LL filling factor, with the energy being largest at half-filling of the $n=0$ level. The magnitude of these shifts, and their magnetic field dependence, suggests that an interaction-enhanced energy gap opens in the $n=0$ level at high magnetic fields. Such interaction effects normally have limited impact on the CR due to Kohn's theorem [W. Kohn, Phys. Rev. {\bf 123}, 1242 (1961)], which does not apply in graphene as a consequence of the underlying linear band structure.

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