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Prolonging valley polarization lifetime through gate-controlled exciton-to-trion conversion in monolayer molybdenum ditelluride

Author

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  • Qiyao Zhang

    (Tsinghua University
    Frontier Science Center for Quantum Information
    Tsinghua University)

  • Hao Sun

    (Tsinghua University
    Frontier Science Center for Quantum Information
    Tsinghua University)

  • Jiacheng Tang

    (Tsinghua University
    Frontier Science Center for Quantum Information
    Tsinghua University)

  • Xingcan Dai

    (Tsinghua University)

  • Zhen Wang

    (Tsinghua University
    Frontier Science Center for Quantum Information
    Tsinghua University)

  • Cun-Zheng Ning

    (Tsinghua University
    Frontier Science Center for Quantum Information
    Tsinghua University)

Abstract

Monolayer 2D semiconductors provide an attractive option for valleytronics due to valley-addressability. But the short valley-polarization lifetimes for excitons have hindered potential valleytronic applications. In this paper, we demonstrate a strategy for prolonging the valley-polarization lifetime by converting excitons to trions through efficient gate control and exploiting the much longer valley-polarization lifetimes for trions than for excitons. At charge neutrality, the valley lifetime of monolayer MoTe2 increases by a factor of 1000 to the order of nanoseconds from excitons to trions. The exciton-to-trion conversion changes the dominant depolarization mechanism from the fast electron-hole exchange for excitons to the slow spin-flip process for trions. Moreover, the degree of valley polarization increases to 38% for excitons and 33% for trions through electrical manipulation. Our results reveal the depolarization dynamics and the interplay of various depolarization channels for excitons and trions, providing an effective strategy for prolonging the valley polarization.

Suggested Citation

  • Qiyao Zhang & Hao Sun & Jiacheng Tang & Xingcan Dai & Zhen Wang & Cun-Zheng Ning, 2022. "Prolonging valley polarization lifetime through gate-controlled exciton-to-trion conversion in monolayer molybdenum ditelluride," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31672-y
    DOI: 10.1038/s41467-022-31672-y
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    References listed on IDEAS

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    1. Ting Cao & Gang Wang & Wenpeng Han & Huiqi Ye & Chuanrui Zhu & Junren Shi & Qian Niu & Pingheng Tan & Enge Wang & Baoli Liu & Ji Feng, 2012. "Valley-selective circular dichroism of monolayer molybdenum disulphide," Nature Communications, Nature, vol. 3(1), pages 1-5, January.
    2. Chongyun Jiang & Fucai Liu & Jorge Cuadra & Zumeng Huang & Ke Li & Abdullah Rasmita & Ajit Srivastava & Zheng Liu & Wei-Bo Gao, 2017. "Zeeman splitting via spin-valley-layer coupling in bilayer MoTe2," Nature Communications, Nature, vol. 8(1), pages 1-6, December.
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    1. Hyeongwoo Lee & Sujeong Kim & Seonhye Eom & Gangseon Ji & Soo Ho Choi & Huitae Joo & Jinhyuk Bae & Ki Kang Kim & Vasily Kravtsov & Hyeong-Ryeol Park & Kyoung-Duck Park, 2024. "Quantum tunneling high-speed nano-excitonic modulator," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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