Exciton-spin interaction in charge-transfer insulators

ORAL

Abstract

We theoretically investigate the correlation between magnetism and exciton creation in antiferromagnets such as van der Waals material NiPS3 by deriving an effective model for exciton-spin interactions in charge-transfer insulators. We show that in these systems the spin exchange interaction around the exciton is strongly enhanced from the original interaction. The exciton behaves like the impurity in the antiferromagnetic background and the local spins related to the exciton site prefer to make the spin multiplet because of the strong spin interaction. We also consider the mobility of the exciton and discuss possible optically allowed excitation peaks associated with the exciton creation and modified spin structure.

*T.K. was supported by Grants-in-Aid for Scientific Research from JSPS, KAKENHI Grant No. JP18K13509. A.J.M. was supported in part by Programmable Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award No. DE-SC0019443. The Flatiron Institute is a division of the Simons Foundation.

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Presenters

  • Tatsuya Kaneko

    • Osaka University

Authors

  • Tatsuya Kaneko

    • Osaka University

  • Yuta Murakami

    • RIKEN CEMS

  • Denis Golez

    • Jozef Stefan Institute

  • Zhiyuan Sun

    • Tsinghua University
    • Harvard University

  • Andrew Millis

    • Columbia University
    • Columbia University, Flatiron Institute