Addressing spin order of magic-angle graphene through edge state equilibration
ORAL
Abstract
Electronic interactions within the flat moiré bands in magic-angle twisted bilayer graphene (MATBG) give rise to a variety of broken-symmetry ground states, including correlated Chern insulators (ChIs) that form due to unequal spin and valley occupation of the fractal Hofstadter spectrum in a magnetic field. However, there is disagreement in the literature regarding the spin-valley order of correlated states in MATBG, and the polarization of the ChIs has not been directly addressed. In this talk, I will describe a new approach to determine the spin ordering of broken-symmetry states in MATBG using a twisted graphene multilayer. By probing the backscattering between counter-propagating edge states in MATBG and a twist-decoupled graphene monolayer, we address the spin polarization of both the quantum Hall states near charge neutrality and the primary sequence of ChIs emerging from integer moiré filling factors. I will discuss the implications of our findings and future directions that build on this platform.
*This work was supported by the QSQM, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES)
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Presenters
Jesse Hoke
Stanford University
Authors
Jesse Hoke
Stanford University
Yifan Li
Stanford University
Julian May-Mann
University of Illinois at Urbana-Champai
University of Illinois at Urbana-Champaign
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
