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
