• 文献标题:   Giant negative magnetoresistance and a transition from strong to weak localization in hydrogenated graphene
  • 文献类型:   Article
  • 作  者:   MATIS BR, BULAT FA, FRIEDMAN AL, HOUSTON BH, BALDWIN JW
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   1098-0121
  • 通讯作者地址:   USN
  • 被引频次:   31
  • DOI:   10.1103/PhysRevB.85.195437
  • 出版年:   2012

▎ 摘  要

A giant negative magnetoresistance of up to 28% at 2.5 T is observed in plasma hydrogenated graphene at the charge neutrality point without any sign of saturation at 2.0 K. A detailed analysis of the gate voltage dependence demonstrates a suppression of the giant negative magnetoresistance, which is accompanied by a crossover from strong localization at low carrier concentrations to weak localization at higher carrier concentrations. Evidence of asymmetry in the electron/hole transport is found in themagnetic field traces at low temperature. The asymmetrical transport is attributed to charge transfer processes at the graphene/metal interface and demonstrates the effect of using invasive contact geometries in hydrogenated graphene devices.