Controlling Linear and Nonlinear Optical Properties of Boron Nitride with Moiré Superlattices

ORAL

Abstract

Van der Waals materials enable the creation of artificial heterostructures with exciting new emergent properties. Recently, the twist angle between adjacent layers has proved to be an important control parameter in these stacks. In this work, we use conventional dry-transfer techniques to fabricate small-twist-angle few-layer hexagonal boron nitride (hBN) heterostructures. We study the resulting moiré superlattice with a variety of linear and nonlinear atomic force microscopy probes. These techniques yield a local variation of the transverse-optical-phonon oscillator strength, near-field second harmonic generation, and the piezoelectric response. These combined demonstrations of hBN moiré physics implicate local strain as an important tuning parameter for the linear and nonlinear optical properties of Van der Waals materials.

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Presenters

  • Samuel Moore

    • Columbia University
    • Physics, Columbia University

Authors

  • Samuel Moore

    • Columbia University
    • Physics, Columbia University

  • Nate Finney

    • Columbia University

  • Kaiyuan Yao

    • Columbia University
    • Mechanical Engineering, Columbia University

  • Leo McGilly

    • Columbia University
    • Physics, Columbia University

  • Guangxin Ni

    • Columbia University
    • Physics, Columbia University

  • Evan Telford

    • Columbia Univ
    • Columbia University

  • P. James Schuck

    • Columbia University
    • Mechanical Engineering, Columbia University

  • Cory Dean

    • Department of Physics, Columbia University
    • Columbia University
    • Columbia Univ
    • Physics, Columbia University

  • James C Hone

    • Columbia University
    • Mechanical Engineering, Columbia University
    • Columbia Univ
    • Physics, Columbia University
    • Columbia University, NY, USA
    • Department of Mechanical Engineering, Columbia University

  • Abhay Narayan

    • Columbia University
    • Physics, Columbia University
    • Columbia Univ

  • Dmitri Basov

    • Columbia University, The Department of Physics
    • Columbia University
    • Physics, Columbia University
    • Columbia Univ
    • Department of Physics, Columbia University