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A Quantum Ruler for Topology and Quantum Geometry in Moiré Superlattices: Part 1/3

ORAL

Abstract

A material's response to magnetic fields provides a wealth of information about its properties, from the shape of its Fermi surface to detailed information about the topological properties of its electronic structure. Moiré materials offer a particularly interesting case study in this response, owing to their large lattice constant. We theoretically analyze the response of twisted double bilayer graphene to magnetic fields using recently developed formalism, which includes higher order corrections in magnetic field. The first-order correction is derived from the gate-tunable valley-contrasting Berry curvature. The second-order correction is governed by the magnetic susceptibility, which is shown to play in important role in this system. Our calculations reveal the role of the moiré superlattice in these strong higher-order responses.

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Presenters

  • Paul Haney

    National Institute of Standards and Technology

Authors

  • Paul Haney

    National Institute of Standards and Technology

  • Marlou R Slot

    National Institute of Standards and Technology

  • Yulia Maximenko

    National Institute of Standards and Technology, National Institute of Standards and Tech

  • Sungmin Kim

    National Institute of Standards and Technology

  • Daniel T Walkup

    National Institute of Standards and Technology

  • En-Min Shih

    National Institute of Standards and Technology, National Institute of Standards and Tech

  • Dilek Yildiz

    NIST / JQI - Physics department UMD, Harvard University

  • Kenji Watanabe

    National Institute for Materials Science, Research Center for Functional Materials, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, NIMS, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Takashi Taniguchi

    National Institute for Materials Science, Kyoto Univ, International Center for Materials Nanoarchitectonics, National Institute of Materials Science, Kyoto University, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Science, Japan, National Institute For Materials Science, NIMS, National Institute for Material Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Yafis Barlas

    University of Nevada, Reno

  • Nikolai Zhitenev

    National Institute of Standards and Technology

  • Fereshte Ghahari

    George Mason University

  • Joseph A Stroscio

    National Institute of Standards and Technology, National Institute of Standards and Tech