Tunable zero-energy transmission resonances in shifted graphene bilayer
| Autor: | Daboussi, A., Mandhour, L., Fuchs, J. N., Jaziri, S. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 89, 085426 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.89.085426 |
| Popis: | A graphene bilayer is known to perfectly reflect normally incident electrons due to their chirality. This is similar to Klein tunneling, which, in a monolayer, is instead responsible for perfect transmission at normal incidence. Stacking defaults turn each parabolic band crossing of a bilayer into pairs of Dirac cones. Here we show that, surprisingly, a stacking default (or shift) in a bilayer can result in perfect {\it transmission} at normal incidence as a result of Fabry-P\'erot type resonances {\it at zero-energy}. These constructive interferences only happen for a specific orientation of the Dirac cones with respect to the incident electron and for quantized values of their separation in reciprocal space. Our results provide a way to control transmission resonances in undoped graphene bilayer structure by adjusting the layer stacking. Comment: 10 pages, 9 figures |
| Databáze: | arXiv |
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