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Zeeman splitting via spin-valley-layer coupling in bilayer MoTe2

Author

Listed:
  • Chongyun Jiang

    (Nanyang Technological University)

  • Fucai Liu

    (Nanyang Technological University)

  • Jorge Cuadra

    (Nanyang Technological University)

  • Zumeng Huang

    (Nanyang Technological University)

  • Ke Li

    (Nanyang Technological University)

  • Abdullah Rasmita

    (Nanyang Technological University)

  • Ajit Srivastava

    (Emory University)

  • Zheng Liu

    (Nanyang Technological University)

  • Wei-Bo Gao

    (Nanyang Technological University
    Nanyang Technological University)

Abstract

Atomically thin monolayer transition metal dichalcogenides possess coupling of spin and valley degrees of freedom. The chirality is locked to identical valleys as a consequence of spin–orbit coupling and inversion symmetry breaking, leading to a valley analog of the Zeeman effect in presence of an out-of-plane magnetic field. Owing to the inversion symmetry in bilayers, the photoluminescence helicity should no longer be locked to the valleys. Here we show that the Zeeman splitting, however, persists in 2H-MoTe2 bilayers, as a result of an additional degree of freedom, namely the layer pseudospin, and spin–valley-layer locking. Unlike monolayers, the Zeeman splitting in bilayers occurs without lifting valley degeneracy. The degree of circularly polarized photoluminescence is tuned with magnetic field from −37% to 37%. Our results demonstrate the control of degree of freedom in bilayer with magnetic field, which makes bilayer a promising platform for spin-valley quantum gates based on magnetoelectric effects.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00927-4
    DOI: 10.1038/s41467-017-00927-4
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    Cited by:

    1. Benjamin Carey & Nils Kolja Wessling & Paul Steeger & Robert Schmidt & Steffen Michaelis de Vasconcellos & Rudolf Bratschitsch & Ashish Arora, 2024. "Giant Faraday rotation in atomically thin semiconductors," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Cheng Gong & Peiyao Zhang & Tenzin Norden & Quanwei Li & Zhen Guo & Apoorva Chaturvedi & Arman Najafi & Shoufeng Lan & Xiaoze Liu & Yuan Wang & Shi-Jing Gong & Hao Zeng & Hua Zhang & Athos Petrou & Xi, 2023. "Ferromagnetism emerged from non-ferromagnetic atomic crystals," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    3. 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.

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