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95. 


Hofstadter butterflies of bilayer graphene



N. Nemec and G. Cuniberti

Physical Review B (Rapid Comm.) 75, 201404(R) (2007)

Selected for the May 21, 2007 issue of the
Virtual Journal of Nanoscale Science & Technology
.

We calculate the electronic spectrum of bilayer graphene in perpendicular magnetic fields non-perturbatively. To accomodate arbitrary displacements between the two layers, we apply a periodic gauge based on singular flux vortices of phase . The resulting Hofstadter-like butterfly plots show a reduced symmetry, depending on the relative position of the two layers against each other. The split of the zero-energy relativistic Landau level differs by one order of magnitude between Bernal- and non-Bernal stacking.



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doi absolute link10.1103/PhysRevB.75.201404
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publisher site (ISSN:1550-235X)
online abstractarXiv preprint: cond-mat/0612369
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