• 文献标题:   Insulating behavior of an amorphous graphene membrane
  • 文献类型:   Article
  • 作  者:   VAN TUAN D, KUMAR A, ROCHE S, ORTMANN F, THORPE MF, ORDEJON P
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   CSIC
  • 被引频次:   9
  • DOI:   10.1103/PhysRevB.86.121408
  • 出版年:   2012

▎ 摘  要

We investigate the charge transport properties of planar amorphous graphene that is fully topologically disordered, in the form of sp(2) threefold coordinated networks consisting of hexagonal rings but also including many pentagons and heptagons distributed in a random fashion. Using the Kubo transport methodology and the Lanczos method, the density of states, mean free paths, and semiclassical conductivities of such amorphous graphene membranes are computed. Despite a large increase in the density of states close to the charge neutrality point, all electronic properties are dramatically degraded, evidencing an Anderson insulating state caused by topological disorder alone. These results are supported by Landauer-Buttiker conductance calculations, which show a localization length as short as 5 nm.