Simultaneous transport and capacitance measurements of a ferroelectric graphene moiré structure

ORAL

Abstract

Moiré materials offer a unique platform to engineer and study exotic condensed matter states. A recurring theme in many moiré systems is the simultaneous presence of itinerant and localized electrons. For instance, in magic-angle graphene, itinerant electrons are probed via transport while the existence of localized electrons is deduced from entropy measurements. In a recent study on a ferroelectric graphene-hBN moiré structure, transport measurement revealed the coexistence of localized and itinerant charges, the coupling of which might lead to the unconventional ferroelectric effect. In this talk, I will present simultaneous transport and capacitance measurements of a similar graphene moiré structure that also shows unconventional ferroelectric characters. Our measurements could more directly probe the possible existence of carriers of distinct characters and shed light on their relation with the observed ferroelectricity.

* This work was primarily supported by the Center for the Advancement of Topological Semimetals (CATS), an Energy Frontier Research Center at the Ames National Laboratory. Work at the Ames National Laboratory is supported by the U.S. Department of Energy (DOE), Basic Energy Sciences (BES) and is operated for the U.S. DOE by Iowa State University under Contract No. DE-AC02-07CH11358.

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Presenters

  • Xueqiao Wang

    Massachusetts Institute of Technology MI

Authors

  • Xueqiao Wang

    Massachusetts Institute of Technology MI

  • Zhiren Zheng

    Massachusetts Institute of Technology

  • Samuel H Aronson

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MI

  • 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

  • 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

  • Raymond C Ashoori

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT

  • Qiong Ma

    Boston College

  • Pablo Jarillo-Herrero

    Massachusetts Institute of Technology MI, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology