• 文献标题:   A graphene quantum dot realized by an armchair graphene nanoribbon with line defect
  • 文献类型:   Article
  • 作  者:   SUI XY, LI ZC, GONG WJ, YU GD, CHEN XH
  • 作者关键词:   armchair graphene nanoribbon, line defect, quantum dot
  • 出版物名称:   PHYSICA STATUS SOLIDIRAPID RESEARCH LETTERS
  • ISSN:   1862-6254 EI 1862-6270
  • 通讯作者地址:   Northeastern Univ
  • 被引频次:   1
  • DOI:   10.1002/pssr.201307152
  • 出版年:   2013

▎ 摘  要

The electron transport in a semiconducting armchair graphene nanoribbon with line defect is theoretically investigated, by coupling it to two normal metallic leads. It is found that the line defect induces a new localized quantum state near the Dirac point, and that the coupling between this state and the leads provides a channel for the resonant tunneling. This means that such a finite-size nanoribbon can be viewed as a quantum dot. When two line defects are present simultaneously, a coupled quantum dot forms, leading to the splitting of the conductance peaks. With these results, we propose such a structure to be a promising candidate of an electron transistor. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim