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Strong interaction between interlayer excitons and correlated electrons in WSe2/WS2 moiré superlattice

Author

Listed:
  • Shengnan Miao

    (Rensselaer Polytechnic Institute)

  • Tianmeng Wang

    (Rensselaer Polytechnic Institute)

  • Xiong Huang

    (University of California
    University of California)

  • Dongxue Chen

    (Rensselaer Polytechnic Institute
    University of Electronic Science and Technology of China)

  • Zhen Lian

    (Rensselaer Polytechnic Institute)

  • Chong Wang

    (Carnegie Mellon University)

  • Mark Blei

    (Arizona State University)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Sefaattin Tongay

    (Arizona State University)

  • Zenghui Wang

    (University of Electronic Science and Technology of China)

  • Di Xiao

    (Carnegie Mellon University)

  • Yong-Tao Cui

    (University of California)

  • Su-Fei Shi

    (Rensselaer Polytechnic Institute
    Rensselaer Polytechnic Institute)

Abstract

Heterobilayers of transition metal dichalcogenides (TMDCs) can form a moiré superlattice with flat minibands, which enables strong electron interaction and leads to various fascinating correlated states. These heterobilayers also host interlayer excitons in a type-II band alignment, in which optically excited electrons and holes reside on different layers but remain bound by the Coulomb interaction. Here we explore the unique setting of interlayer excitons interacting with strongly correlated electrons, and we show that the photoluminescence (PL) of interlayer excitons sensitively signals the onset of various correlated insulating states as the band filling is varied. When the system is in one of such states, the PL of interlayer excitons is relatively amplified at increased optical excitation power due to reduced mobility, and the valley polarization of interlayer excitons is enhanced. The moiré superlattice of the TMDC heterobilayer presents an exciting platform to engineer interlayer excitons through the periodic correlated electron states.

Suggested Citation

  • Shengnan Miao & Tianmeng Wang & Xiong Huang & Dongxue Chen & Zhen Lian & Chong Wang & Mark Blei & Takashi Taniguchi & Kenji Watanabe & Sefaattin Tongay & Zenghui Wang & Di Xiao & Yong-Tao Cui & Su-Fei, 2021. "Strong interaction between interlayer excitons and correlated electrons in WSe2/WS2 moiré superlattice," Nature Communications, Nature, vol. 12(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23732-6
    DOI: 10.1038/s41467-021-23732-6
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    Cited by:

    1. Jinjae Kim & Jiwon Park & Hyojin Choi & Taeho Kim & Soonyoung Cha & Yewon Lee & Kenji Watanabe & Takashi Taniguchi & Jonghwan Kim & Moon-Ho Jo & Hyunyong Choi, 2024. "Correlation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Hongbing Cai & Abdullah Rasmita & Qinghai Tan & Jia-Min Lai & Ruihua He & Xiangbin Cai & Yan Zhao & Disheng Chen & Naizhou Wang & Zhao Mu & Zumeng Huang & Zhaowei Zhang & John J. H. Eng & Yuanda Liu &, 2023. "Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    3. Beini Gao & Daniel G. Suárez-Forero & Supratik Sarkar & Tsung-Sheng Huang & Deric Session & Mahmoud Jalali Mehrabad & Ruihao Ni & Ming Xie & Pranshoo Upadhyay & Jonathan Vannucci & Sunil Mittal & Kenj, 2024. "Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré WS2/WSe2 heterobilayer," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    4. Xiaotong Chen & Zhen Lian & Yuze Meng & Lei Ma & Su-Fei Shi, 2023. "Excitonic Complexes in Two-Dimensional Transition Metal Dichalcogenides," Nature Communications, Nature, vol. 14(1), pages 1-5, December.
    5. Zhen Lian & Dongxue Chen & Lei Ma & Yuze Meng & Ying Su & Li Yan & Xiong Huang & Qiran Wu & Xinyue Chen & Mark Blei & Takashi Taniguchi & Kenji Watanabe & Sefaattin Tongay & Chuanwei Zhang & Yong-Tao , 2023. "Quadrupolar excitons and hybridized interlayer Mott insulator in a trilayer moiré superlattice," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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