Reversible Nanoscale Control of the Charge Neutrality Point in Graphene Using LaAlO<sub>3</sub>/SrTiO<sub>3</sub> Heterostructures

ORAL

Abstract

The properties of graphene depend sensitively on doping with respect to the charge-neutrality point (CNP). Tuning the CNP usually involves electrical gating or chemical doping. Here, we describe a technique to reversibly control the CNP in graphene with extreme nanoscale precision, using LaAlO3/SrTiO3 (LAO/STO) heterostructures and conductive atomic force microscope (c-AFM) lithography. The conductivity of the LAO/STO interface can be tuned using a conductive AFM tip, even through graphene transferred on, affecting the LAO/STO interface conductive while shifting the position of graphene CNP. Here we demonstrate that edge state engineering can be achieved from this method using the quantum Hall effect. Clear quantized resistance at plateaus h/e2 and h/3e2 are observed in a split Hall device, demonstrating edge transport along the c-AFM written edge. This technique can be extended to many other device geometries.

*JL acknowledges a Vannevar Bush Faculty Fellowship, funded by ONR (N00014-15-1-2847). JL and BD acknowledge support from ONR (N00014-16-1-3152). C-BE acknowledges NSF DMREF (DMR-1629270), AFOSR (FA9550-15-1-0334), and AOARD (FA2386-15-1-4046).

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Presenters

  • Jianan Li

    • Department of Physics and Astronomy, University of Pittsburgh
    • Department of Physics, University of Pittsburgh
    • University of Pittsburgh
    • Department of Physics & Astronomy, University of Pittsburgh
    • Physics and Astronomy, University of Pittsburgh

Authors

  • Jianan Li

    • Department of Physics and Astronomy, University of Pittsburgh
    • Department of Physics, University of Pittsburgh
    • University of Pittsburgh
    • Department of Physics & Astronomy, University of Pittsburgh
    • Physics and Astronomy, University of Pittsburgh

  • Qing Guo

    • Department of Physics and Astronomy, University of Pittsburgh
    • University of Pittsburgh

  • Jen-Feng Hsu

    • University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh

  • Shan Hao

    • Department of Physics & Astronomy, University of Pittsburgh
    • University of Pittsburgh

  • Yang Hu

    • Department of Physics and Astronomy, University of Pittsburgh
    • Department of Physics & Astronomy, University of Pittsburgh
    • University of Pittsburgh

  • Hyungwoo Lee

    • Department of Materials Science and Engineering, University of Wisconsin–Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • Department of Material Science and Engineering, University of Wisconsin-Madison
    • Materials Science and Engineering, University of Wisconsin-Madison
    • Materials Science and Engineering, Univ of Wisconsin-Madison
    • University of Wisconsin–Madison

  • Jungwoo Lee

    • Department of Materials Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • Department of Materials Science and Engineering, University of Wisconsin–Madison
    • Department of Material Science and Engineering, University of Wisconsin-Madison
    • Materials Science and Engineering, University of Wisconsin-Madison
    • Materials Science and Engineering, Univ of Wisconsin-Madison

  • Chang-Beom Eom

    • Department of Materials Science and Engineering, University of Wisconsin–Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • Department of Material Science and Engineering, University of Wisconsin-Madison
    • Materials Science and Engineering, University of Wisconsin-Madison
    • Materials Science and Engineering, Univ of Wisconsin-Madison
    • University of Wisconsin–Madison

  • Brian R D'Urso

    • Department of Physics, University of Montana
    • Montana State University

  • Patrick Irvin

    • Department of Physics and Astronomy, University of Pittsburgh
    • Department of Physics, University of Pittsburgh
    • University of Pittsburgh
    • Department of Physics & Astronomy, University of Pittsburgh
    • Physics and Astronomy, University of Pittsburgh

  • Jeremy Levy

    • Department of Physics and Astronomy, University of Pittsburgh
    • Department of Physics, University of Pittsburgh
    • University of Pittsburgh
    • Department of Physics & Astronomy, University of Pittsburgh
    • Physics and Astronomy, University of Pittsburgh