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Nanoscale Lattice Dynamics in Hexagonal Boron Nitride Moiré Superlattices

ORAL

Abstract

Moiré superlattices enable a new means to tune the properties of quantum materials. Past research has found extensive control of electronic properties with moiré effects. There, scanning probe measurements have supported those measurements with microscopic origins for the observations. However, less is known about moiré vibrational properties, with measurements limited to far-field Raman spectroscopy. Here, we present a deterministic procedure for obtaining large-area moiré hexagonal boron nitride (hBN) domains. We use near-field infrared imaging to study the strong in-plane hBN phonon resonance in a moiré superlattice with 250-nm periodicity. We explain the observations with mechanical relaxation simulations and vibrational ab-initio calculations. By revealing a strong interplay between vibrational, mechanical, and atomic registry so far unidentified in far-field experiments, we take a larger step towards moiré tunability of quantum material vibrational properties.

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Presenters

  • Samuel Moore

    Department of Physics, Columbia University, Columbia University

Authors

  • Samuel Moore

    Department of Physics, Columbia University, Columbia University

  • Dorri Halbertal

    Columbia University, Columbia Univ, Physics, Columbia University

  • Christopher Ciccarino

    Harvard University, Physics, Harvard University

  • Leo J McGilly

    Columbia University

  • Nathan Finney

    Columbia University, Mechanical Engineering, Columbia University

  • Kaiyuan Yao

    Columbia University

  • GuangXin Ni

    Columbia University, Florida State University, Physics, Florida State University

  • Yinming Shao

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

  • Aaron Sternbach

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

  • Evan Telford

    Chemistry, Columbia University, Columbia University

  • Brian Sae Yoon Kim

    Columbia University

  • Abhay Narayan

    Department of Physics, Columbia University, Physics, Columbia University, Columbia Univ, Department of Physics, Columbia University, New York, New York 10027, USA, Columbia University

  • Cory Dean

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

  • James Hone

    Columbia Univ, Columbia University, Department of Mechanical Engineering, Columbia University, Mechanical Engineering, Columbia University

  • Michael Fogler

    University of California, San Diego, Department of Physics, University of California San Diego, UC San Diego, Department of Physics, University of California, San Diego, UCSD, University of California San Diego

  • Prineha Narang

    Harvard University, SEAS, Harvard University, John A. Paulson School of Engineering & Applied Science, Harvard University, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Physics, Harvard University, John A. Paulson School of Engineering and Applied Sciences, Harvard University

  • P James Schuck

    Department of Mechanical Engineering, Columbia University, Columbia University

  • Dmitri Basov

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