Two-dimensional ferroelectric van der Waals heterostructures and domain dynamics

ORAL

Abstract

Layered ferroelectric materials such as CuInP2S6 (CIPS) offer a huge potential for adding functionality in van der Waals (vdW) heterostructures and furthermore the opportunity to investigate some fundamental physics related to confinement in two dimensions plus the effect of electrostatic doping through ferroelectric polarization modulation. In this study we investigate, through piezoresponse force microscopy (PFM), pure-phase CIPS flakes exfoliated by standard Scotch tape methods and incorporated into vdW stacks through a dry-transfer technique. We show that the vdW interface electrostatic environment has significant effects on the local domain structure. Local switching dynamics determined by PFM were also observed to depend on the exact device geometry.

*Swiss National Science Foundation grant no. P300P2_171433

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Presenters

  • Leo McGilly

    • Physics Department, Columbia University
    • Columbia University

Authors

  • Leo McGilly

    • Physics Department, Columbia University
    • Columbia University

  • Daniel A Rhodes

    • Columbia University
    • Physics, Columbia University
    • National High Magnetic Field Laboratory, Tallahassee, FL-32310, USA.
    • Columbia Nano Initiative, Columbia University
    • Department of Mechanical Engineering, Columbia University, New York, NY 10027 USA
    • Mechanical Engineering, Columbia University
    • Columbia Univ

  • Michael Grandel

    • Columbia University

  • James Hone

    • Columbia University
    • Mechanics, Columbia University
    • Department of Mechanical Engineering, Columbia University in the City of New York
    • Department of Mechanical Engineering, Columbia University
    • Department of Mechanical Engineering, Columbia University, New York, NY 10027 USA
    • Mechanical Engineering, Columbia University

  • Abhay Pasupathy

    • Columbia University
    • Physics, Columbia University
    • Department of Physics, Columbia University in the City of New York
    • Physics Department, Columbia University
    • Department of Physics, Columbia University