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Transport anisotropy of one-dimensional graphene superlattice induced by periodic ferroelectric domains

ORAL

Abstract

We investigate the transport anisotropy in one-dimensional (1D) graphene superlattice (GSL) induced by prepatterned periodic domains in a ferroelectric bottom gate. We work with 50 nm single crystalline ferroelectric Pb(Zr,Ti)O3 (PZT) films deposited on (La,Sr)MnO3 buffered SrTiO3 substrates. Periodic polarization up (Pup) and down (Pdown) stripe domains are patterned on PZT using conductive atomic force microscopy. The domain periodicity varies from 200 nm to 266 nm. We then transfer hBN-graphene stacks onto the pre-patterned domains and fabricate them into top-gated FET devices. The difference in carrier density between the two polarization regions reaches around 3×1013 cm-2 at 2 K due to the pyroelectric effect. For the 1D GSL with current perpendicular to the stripe domains, the hBN top gate induces extra Dirac points in R(Vg), with the position further splitting in magnetic field. We also investigate how the magnetoresistance and quantum Hall effects of the GSL vary with the current direction with respect to the stripe domain orientation.

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Presenters

  • Tianlin Li

    University of Nebraska - Lincoln

Authors

  • Tianlin Li

    University of Nebraska - Lincoln

  • Hanying Chen

    University of Nebraska - Lincoln

  • Kun Wang

    University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and NanoscienceUniversity of Nebraska - Lincoln, Physics and Astronomy, University of Nebraska-Lincoln

  • Yifei Hao

    University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience,University of Nebraska - Lincoln, Physics and Astronomy, University of Nebraska-Lincoln

  • Le Zhang

    University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln

  • Qiuchen Wu

    University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and NanoscienceUniversity of Nebraska - Lincoln, Physics and Astronomy, University of Nebraska-Lincoln

  • Takashi Taniguchi

    National Institute for Materials Science, Kyoto Univ, International Center for Materials Nanoarchitectonics, National Institute of Materials Science, Kyoto University, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Science, Japan, National Institute For Materials Science, NIMS, National Institute for Material Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Kenji Watanabe

    National Institute for Materials Science, Research Center for Functional Materials, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, NIMS, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Xia Hong

    Physics and Astronomy, University of Nebraska-Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln