Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Optical properties

HL 13.11: Vortrag

Dienstag, 24. März 2009, 12:15–12:30, BEY 118

Cyclotron resonance of a massless quasi-particle in graphene — •Sergey A. Mikhailov — Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

The classical motion of a massless graphene quasi-particle in a magnetic field and under a weak electromagnetic radiation with the frequency ω is considered. It is shown that, due to the non-parabolic, linear energy dispersion of the quasi-particle, it responds not only at the frequency ω but generates a broad frequency spectrum around it. The linewidth of the cyclotron resonance turns out to be very broad even in a perfectly pure material which allows one to explain recent experimental data [1,2]. It is concluded that the linear response theory does not work in graphene in finite magnetic fields and the electromagnetic response of graphene should be studied by the methods of non-linear dynamics and chaos.

[1] Z. Jiang et al, Phys. Rev. Lett. 98, 197403 (2007)

[2] R. S. Deacon et al, Phys. Rev. B 76, 081406 (2007).