Research Article

Nano Research

, Volume 6, Issue 5, pp 326-334

Highly defective graphene: A key prototype of two-dimensional Anderson insulators

  • Aurélien LherbierAffiliated withInstitute of Condensed Matter and Nanoscience (IMCN), Université catholique de Louvain (UCL) Email author 
  • , Stephan RocheAffiliated withCatalan Institute of Nanotechnology, CIN2 (ICN-CSIC) and Universitat Autónoma de Barcelona, Campus UABInstitució Catalana de Recerca i Estudis Avançats, ICREA
  • , Oscar A. RestrepoAffiliated withInstitute of Condensed Matter and Nanoscience (IMCN), BSMA, Université catholique de Louvain (UCL)
  • , Yann-Michel NiquetAffiliated withL_Sim, SP2M, UMR-E CEA/UJF-Grenoble 1, INAC
  • , Arnaud DelcorteAffiliated withInstitute of Condensed Matter and Nanoscience (IMCN), BSMA, Université catholique de Louvain (UCL)
  • , Jean-Christophe CharlierAffiliated withInstitute of Condensed Matter and Nanoscience (IMCN), Université catholique de Louvain (UCL)

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Abstract

Electronic structure and transport properties of highly defective two-dimensional (2D) sp2 graphene are investigated theoretically. Classical molecular dynamics are used to generate large graphene planes containing a considerable amount of defects. Then, a tight-binding Hamiltonian validated by ab initio calculations is constructed in order to compute quantum transport within a real-space order-N Kubo-Greenwood approach. In contrast to pristine graphene, the highly defective sp2 carbon sheets exhibit a high density of states at the charge neutrality point raising challenging questions concerning the electronic transport of associated charge carriers. The analysis of the electronic wavepacket dynamics actually reveals extremely strong multiple scattering effects giving rise to mean free paths as low as 1 nm and localization phenomena. Consequently, highly defective graphene is envisioned as a remarkable prototype of 2D Anderson insulating materials.
http://static-content.springer.com/image/art%3A10.1007%2Fs12274-013-0309-7/MediaObjects/12274_2013_309_Fig1_HTML.gif

Keywords

graphene electronic transport Anderson insulators localization