Modulation effects on Landau levels in a monolayer graphene
| Autor: | Ho, J. H., Lai, Y. H., Chiu, Y. H., Lin, M. F. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | A monolayer graphene exists in an environment where a uniform magnetic field interacts a spatially modulated magnetic field. The spatially modulated magnetic field could affect Landau levels due to a uniform magnetic field. The modulation effects on Landau levels are investigated through the Peierl's tight-binding model. The magneto-electronic properties are dominated by the period, the strength, and the direction of a spatially modulated magnetic field. Such a field could induce the growth in dimensionality, the change of energy dispersions, the destroy of state degeneracy, and the creation of band-edge states. There are a robust Landau level at Fermi level and 1D parabolic subbands located around the original Landau levels, which make density of states exhibit a delta-function-like structure and many pairs of asymmetric peak structure, respectively. The density of states and the energies of band-edge states strongly depend on the strength, but not on the period and the direction. Comment: 11 pages,4 figures |
| Databáze: | arXiv |
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