2p interlayer exciton revealed by hybridization in bilayer MoS2

ORAL

Abstract

We reveal the 2p interlayer exciton along with a Rydberg series of interlayer states extending from 1s to 4s in bilayer MoS2. The 2p state, optically dark at zero field, acquires oscillator strength under an applied electric field through hybridization with the intralayer A exciton. Due to its finite angular momentum, it exhibits distinct selection rules and g-factors in agreement with theoretical expectations. Strikingly, whereas the intralayer Rydberg series fades beyond the 2s state, the interlayer series remains optically visible up to 4s due to the hybridization with the intralayer B exciton. Simulations further uncover a novel coupling mechanism between s-like intralayer and p-like interlayer excitons—one driven not by conventional electron–hole Coulomb interactions, but by interlayer conduction band mixing.

*C.H.L. acknowledges support from the National Science Foundation (NSF) Division of Materials Research CAREER Award No. 1945660 and from the American Chemical Society Petroleum Research Fund No. 61640-ND6. Y.C.C acknowledges support from National Science and Technology Council, Taiwan (grant no. NSTC 112-2112-M-001-054-MY2). K.W. and T.T. acknowledge support from the JSPS KAKENHI (Grant Numbers 19H05790, 20H00354 and 21H05233). N.M.G. and S.C. were supported by ARO MURI grant No. W911NF-24-1-0292 and the Army Research Office Electronics Division Award no.W911NF-21-1-0260. N.M.G was also supported by the Presidential Early Career Award for Scientists and Engineers (PECASE) through the Air Force Office of Scientific Research (award no. FA9550-20-1-0097).

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Publication: 2p Interlayer Exciton Revealed by Hybridization in Bilayer MoS2
S. Cha, Z. Xu, T. Ouyang, H. Yao, R. K. Paudel, T. Taniguchi, K. Watanabe, A. Joe, Y. C. Chang, N. Gabor & C.H. Lui
preprint (2025)

Presenters

  • Zhaoran Xu

    • University of California, Riverside

Authors

  • Zhaoran Xu

    • University of California, Riverside

  • Soonyoung Cha

    • Sookmyung Women's University

  • Tianyi Ouyang

    • University of California, Riverside

  • Hongyu Yao

    • University of California, Riverside

  • Raj K Paudel

    • Academia Sinica

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

  • Andrew Y Joe

    • University of California, Riverside

  • Yia-Chung Chang

    • Physics Department, National Cheng-Kung University
    • Academia Sinica

  • Nathaniel Monroe Gabor

    • University of California, Riverside

  • Chun Hung Lui

    • University of California, Riverside