Long-Lived Isospin Excitations in Magic-Angle Twisted Bilayer Graphene

ORAL

Abstract

Magic-angle twisted bilayer graphene (MATBG) has emerged as a rich platform for exploring strongly correlated phenomena, including superconductivity and cascade behavior. Despite significant progress, the dynamics underlying these correlated states remain poorly understood. Here, we report on our study of isospin dynamics for MATBG using exciton sensing combined with optical pump-probe spectroscopy. Our findings reveal pronounced isospin fluctuations, providing new insights into the collective excitations within MATBG and highlighting a novel approach for studying dynamics in other graphene systems.

*Air Force Office of Scientific Research under award FA9550-23-1-0117. National Science Foundation Graduate Research Fellowship under grant no. 2139319.

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Publication: Xie, T., Xu, S., Dong, Z. et al. Long-lived isospin excitations in magic-angle twisted bilayer graphene. Nature 633, 77–82 (2024). https://doi.org/10.1038/s41586-024-07880-5

Presenters

  • Tian Xie

    • University of California, Santa Barbara

Authors

  • Tian Xie

    • University of California, Santa Barbara

  • Siyuan Xu

    • UCSB
    • University of California, Santa Barbara
    • University of California Santa Barbara

  • Zhiyu Dong

    • Caltech
    • Massachusetts Institute of Technology

  • Zhiyuan Cui

    • University of California at Santa Barbara

  • Yunbo Ou

    • Massachusetts Institute of Technology

  • Melike Erdi

    • Arizona State 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

  • Sefaattin Tongay

    • Arizona State University

  • Leonid Levitov

    • Massachusetts Institute of Technology

  • Chenhao Jin

    • University of California, Santa Barbara
    • Cornell University
    • University of California at Santa Barbara