Abstract
It is shown that exciton swapping between two graphene sheets may occur under specific conditions. A magnetically tunable optical filter is described to demonstrate this new effect. Mathematically, it is shown that two turbostratic graphene layers can be described as a “noncommutative” two-sheeted (2 + 1)-spacetime thanks to a formalism previously introduced for the study of braneworlds in high energy physics. The Hamiltonian of the model contains a coupling term connecting the two layers which is similar to the coupling existing between two braneworlds at a quantum level. In the present case, this term is related to a K-K ′ intervalley coupling. In addition, the experimental observation of this effect could be a way to assess the relevance of some theoretical concepts of the braneworld hypothesis.
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Sarrazin, M., Petit, F. Exciton swapping in a twisted graphene bilayer as a solid-state realization of a two-brane model. Eur. Phys. J. B 87, 26 (2014). https://doi.org/10.1140/epjb/e2013-40492-5
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DOI: https://doi.org/10.1140/epjb/e2013-40492-5