Photo-induced Modulation Doping in Graphene/Boron nitride Heterostructures

ORAL

Abstract

Van der Waals heterostructures (VDH) provide an exciting new platform for materials engineering, where a variety of layered materials with different electrical, optical and mechanical responses can be stacked together to enable new physics and novel functionalities. We report an emerging optoelectronic phenomenon (i.e. photo-induced modulation doping) in the graphene-boron nitride VDH (G/BN heterostructure). We find it enables flexible and repeatable writing and erasing of charge doping in graphene with optical light. We show that the photo-induced modulation doping maintains the remarkable carrier mobility of the G/BN heterostructure, and it can be used to generate spatially varying doping profiles like pn junctions. Our work contributes towards understanding light matter interactions in VDHs, and introduces a simple technique for creating inhomogeneous doping in high mobility graphene devices.

*J. Velasco Jr. acknowledges support from UC President's Postdoctoral Fellowship

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Authors

  • Jairo Velasco

    • Deptartment of Physics, Universtiy of California, Berkeley
    • Univ of California - Berkeley
    • University of California, Berkeley

  • Long Ju

    • Deptartment of Physics, Universtiy of California, Berkeley

  • Edwin Hwang

    • Deptartment of Physics, Universtiy of California, Berkeley

  • Salman Kahn

    • Deptartment of Physics, Universtiy of California, Berkeley

  • Casey Nosiglia

    • Deptartment of Physics, Universtiy of California, Berkeley

  • Hsin-Zon Tsai

    • Deptartment of Physics, Universtiy of California, Berkeley

  • Wei Yang

    • Bejing National Laboratory for Condendsed Matter Physics and Institute of Physics

  • Guangyu Zhang

    • Bejing National Laboratory for Condendsed Matter Physics and Institute of Physics

  • Takashi Taniguchi

    • Advanced National Laboratory, National Institute for Materials Science

  • Kenji Watanabe

    • Advanced National Laboratory, National Institute for Materials Science

  • Yuanbo Zhang

    • Department of Physics, Fudan University

  • Michael Crommie

    • Deptartment of Physics, Universtiy of California, Berkeley

  • Alex Zettl

    • Deptartment of Physics, Universtiy of California, Berkeley

  • Feng Wang

    • Deptartment of Physics, Universtiy of California, Berkeley