• 文献标题:   Exciton swapping in a twisted graphene bilayer as a solid-state realization of a two-brane model
  • 文献类型:   Article
  • 作  者:   SARRAZIN M, PETIT F
  • 作者关键词:  
  • 出版物名称:   EUROPEAN PHYSICAL JOURNAL B
  • ISSN:   1434-6028 EI 1434-6036
  • 通讯作者地址:   Univ Namur
  • 被引频次:   4
  • DOI:   10.1140/epjb/e2013-40492-5
  • 出版年:   2014

▎ 摘  要

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.