Engineering heterostrain to strongly distort moire lattices: direct imaging and transport properties, Part II

ORAL

Abstract

Moire superlattices in vdW heterostructures have been a popular and fruitful area of study due to the interesting physics they can exhibit. These studies usually rely on twisting layers during the stacking process to set the moire wavelength, which is a key dimension modifying electronic behavior.

Heterostrain of vdW devices offers an additional method to tune the moire wavelength, extending the range of accessible wavelengths or even altering the symmetries of the superlattice.

To explore the effects of heterostrain on moire devices, we’ve developed methods to mechanically reconfigure vdW heterostructures using microfabricated metal features which can strongly grip, slide, and stretch layers relative to each other, allowing us to substantially heterostrain devices.

In this 2 part talk, we will discuss our progress towards fabricating aligned graphene-hBN heterostructures, applying ~1% strain to the graphene layer, directly imaging the resultant extreme distortion of strained moire superlattices, and performing electronic transport characterization.

* NSF Career award 2046849, Eddleman Quantum Instidute

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Publication: Andrew Z. Barabas et al. ,Mechanically reconfigurable van der Waals devices via low-friction gold sliding. Sci. Adv.9, eadf9558(2023). DOI: 10.1126/sciadv.adf9558

Presenters

  • Ian Sequeira

    University of California, Irvine

Authors

  • Ian Sequeira

    University of California, Irvine

  • Andrew Barabas

    University of California, Irvine

  • Michaela Bacani

    University of California, Irvine, University of California Irvine

  • Aaron H Barajas Aguilar

    University of California, Irvine

  • yuhui yang

    University of California, Irvine

  • Takashi Taniguchi

    Kyoto Univ, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics, Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Sciences, NIMS, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science, International Center for Materials Nanoarchitectonics, NIMS, Japan, International Center for Materials Nanoarchitectonics, Tsukuba, National Institue for Materials Science, Kyoto University, National Institute of Materials Science, International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • Kenji Watanabe

    National Institute for Materials Science, NIMS, Research Center for Electronic and Optical Materials, National Institute for Materials Science, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science

  • Javier Sanchez-Yamagishi

    University of California Irvine, University of California, Irvine