Low-field magnetotransport in graphene cavity devices

Research output: Contribution to journalArticle

Abstract

Confinement and edge structures are known to play significant roles in the electronic and transport properties of two-dimensional materials. Here, we report on low-temperature magnetotransport measurements of lithographically patterned graphene cavity nanodevices. It is found that the evolution of the low-field magnetoconductance characteristics with varying carrier density exhibits different behaviors in graphene cavity and bulk graphene devices. In the graphene cavity devices, we observed that intravalley scattering becomes dominant as the Fermi level gets close to the Dirac point. We associate this enhanced intravalley scattering to the effect of charge inhomogeneities and edge disorder in the confined graphene nanostructures. We also observed that the dephasing rate of carriers in the cavity devices follows a parabolic temperature dependence, indicating that the direct Coulomb interaction scattering mechanism governs the dephasing at low temperatures. Our results demonstrate the importance of confinement in carrier transport in graphene nanostructure devices.

Details

Authors
  • G. Q. Zhang
  • N. Kang
  • J. Y. Li
  • Li Lin
  • Hailin Peng
  • Zhongfan Liu
  • H. Q. Xu
Organisations
External organisations
  • Peking University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics

Keywords

  • grapheme, graphene nanostructures, phase coherent transport, weak localization
Original languageEnglish
Article number205707
JournalNanotechnology
Volume29
Issue number20
Publication statusPublished - 2018 Mar 23
Publication categoryResearch
Peer-reviewedYes