Landau levels and oscillator strength in a biased bilayer of graphene

Details Landau levels and oscillator strength in a biased bilayer of graphene Landau levels and oscillator strength in a biased bilayer of graphene

2007-08-06

arxiv.org/abs/0708.0843v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Phys. Rev. B

Scientific paper

We obtain analytical expressions for the eigenstates and the Landau level spectrum of biased graphene bilayers in a magnetic field. The calculations are performed in the context of a four-band continuum model and generalize previous approximate results. Solutions are presented for the spectrum as a function of interlayer coupling, the potential difference between the layers and the magnetic field. The explicit expressions allow us to calculate the oscillator strength and the selection rules for electric dipole transitions between the Landau states. Some transitions are significantly shifted in energy relative to those in an unbiased bialyer and exhibit a very different magnetic field dependence.

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