Towards a millikelvin quantum twisting microscope

ORAL

Abstract

The quantum twisting microscope (QTM) offers unprecedented in-situ tunability of the twist angle in moiré van der Waals heterostructures, providing a powerful tool for exploring electronic correlations in 2D materials. This parameter space can be further explored under extreme conditions, such as millikelvin temperatures and high magnetic fields, by tuning systems like twisted bilayer graphene into superconducting phases. Here, we present our ongoing experimental efforts to develop a custom QTM compatible with a dry top-loading dilution refrigerator. We will discuss key aspects of the microscope design, focusing on versatility, millikelvin compatibility, and tip fabrication processes. Additionally, we discuss instrumentation efforts in reducing vibrational noise, which is essential for high-resolution QTM experiments. Our work outlines a pathway towards the goal of performing high-resolution QTM experiments in dry dilution refrigerators that can facilitate future research into correlated electron systems.

*We acknowledge funding from the DOE and NSF-MRSEC for this project.

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Presenters

  • Christopher Cheung

    • Princeton University

Authors

  • Christopher Cheung

    • Princeton University

  • Jiachen Yu

    • Princeton University

  • Dmitrii S Kalashnikov

    • Princeton University

  • Kenji Watanabe

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

  • Takashi Taniguchi

    • National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Ali Yazdani

    • Princeton University