Excitations from Filled Landau Levels in Graphene

Abstract

We consider graphene in a strong perpendicular magnetic field at zero temperature with an integral number of filled Landau levels and study the dispersion of single particle-hole excitations. We first analyze the two-body problem of a single Dirac electron and hole in a magnetic field interacting via Coulomb forces. We then turn to the many-body problem, where particle-hole symmetry and the existence of two valleys lead to a number of effects peculiar to graphene. We find that the coupling together of a large number of low-lying excitations leads to strong many-body corrections, which could be observed in inelastic light scattering or optical absorption. We also discuss in detail how the appearance of different branches in the exciton dispersion is sensitive to the number of filled spin and valley sublevels.

15 pages, 19 figures

References in corpus (4)

• Electric Field Effect in Atomically Thin Carbon Films
• Electronic States of Graphene Nanoribbons
• Unconventional Integer Quantum Hall effect in graphene
• Edge States and the Quantized Hall Effect in Graphene

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• Metastable bound states of the quasi-bimagnetoexcitons in the lowest Landau levels approximation
• Anomalous Induced Density of Supercritical Coulomb Impurities in Graphene Under Strong Magnetic Fields