• 文献标题:   Tunable quantum dots in bilayer graphene
  • 文献类型:   Article
  • 作  者:   PEREIRA JM, VASILOPOULOS P, PEETERS FM
  • 作者关键词:  
  • 出版物名称:   NANO LETTERS
  • ISSN:   1530-6984
  • 通讯作者地址:   Univ Antwerp
  • 被引频次:   134
  • DOI:   10.1021/nl062967s
  • 出版年:   2007

▎ 摘  要

We demonstrate theoretically that quantum dots in bilayers of graphene can be realized. A position-dependent doping breaks the equivalence between the upper and lower layer and lifts the degeneracy of the positive and negative momentum states of the dot. Numerical results show the simultaneous presence of electron and hole confined states for certain doping profiles and a remarkable angular momentum dependence of the quantum dot spectrum, which is in sharp contrast with that for conventional semiconductor quantum dots. We predict that the optical spectrum will consist of a series of nonequidistant peaks.