• 文献标题:   Novel Transport Properties in Monolayer Graphene with Velocity Modulation
  • 文献类型:   Article
  • 作  者:   SUN LF, FANG C, LIANG TX
  • 作者关键词:  
  • 出版物名称:   CHINESE PHYSICS LETTERS
  • ISSN:   0256-307X EI 1741-3540
  • 通讯作者地址:   Tsinghua Univ
  • 被引频次:   6
  • DOI:   10.1088/0256-307X/30/4/047201
  • 出版年:   2013

▎ 摘  要

We investigate the transport properties of Dirac fermions through velocity-modulation structures, with the Fermi velocity inside the barriers larger than the one outside. It is shown that the transmission exhibits pseudo-periodicity with the incident angle below the critical transmission angle, but attenuates exponentially in the opposite situation. It is found that in the transmission, (1) the pseudo-periodicity turns to periodicity with suitable modulation; (2) line-type peaks appear in the exponential attenuation region for multiple velocity barriers; (3) peak splitting occurs with the number of the velocity barriers increasing. Some sharp oscillations with the falling-edge slopes close to infinity exist in the conductance profile. These novel transport properties suggest significant potential applications in graphene-based devices.