Exciton swapping in a twisted graphene bilayer as a solid-state realization of a two-brane model
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.
Keywords
Cite
@article{arxiv.1209.1712,
title = {Exciton swapping in a twisted graphene bilayer as a solid-state realization of a two-brane model},
author = {Michael Sarrazin and Fabrice Petit},
journal= {arXiv preprint arXiv:1209.1712},
year = {2014}
}
Comments
15 pages, 3 figures, final version published in European Physical Journal B