Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-04-08
Nano Letters 10 (2010) 804-808
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 5 figures
Scientific paper
10.1021/nl902948m
We study the electronic structure of two Dirac electron gazes coupled by a periodic Hamiltonian such as it appears in rotated graphene bilayers. Ab initio and tight-binding approaches are combined and show that the spatially periodic coupling between the two Dirac electron gazes can renormalize strongly their velocity. We investigate in particular small angles of rotation and show that the velocity tends to zero in this limit. The localization is confirmed by an analysis of the eigenstates which are localized essentially in the AA zones of the Moire patterns.
de Laissardiere Guy Trambly
Magaud Laurence
Mayou Didier
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