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Valley-selective circular dichroism of monolayer molybdenum disulphide

Author

Listed:
  • Ting Cao

    (International Center for Quantum Materials, Peking University)

  • Gang Wang

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Wenpeng Han

    (State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences)

  • Huiqi Ye

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Chuanrui Zhu

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Junren Shi

    (International Center for Quantum Materials, Peking University)

  • Qian Niu

    (International Center for Quantum Materials, Peking University
    University of Texas at Austin)

  • Pingheng Tan

    (State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences)

  • Enge Wang

    (International Center for Quantum Materials, Peking University)

  • Baoli Liu

    (Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Ji Feng

    (International Center for Quantum Materials, Peking University)

Abstract

A two-dimensional honeycomb lattice harbours a pair of inequivalent valleys in the k-space electronic structure, in the vicinities of the vertices of a hexagonal Brillouin zone, K±. It is particularly appealing to exploit this emergent degree of freedom of charge carriers, in what is termed 'valleytronics'. The physics of valleys mimics that of spin, and will make possible devices, analogous to spintronics, such as valley filter and valve, and optoelectronic Hall devices, all very promising for next-generation electronics. The key challenge lies with achieving valley polarization, of which a convincing demonstration in a two-dimensional honeycomb structure remains evasive. Here we show, using first principles calculations, that monolayer molybdenum disulphide is an ideal material for valleytronics, for which valley polarization is achievable via valley-selective circular dichroism arising from its unique symmetry. We also provide experimental evidence by measuring the circularly polarized photoluminescence on monolayer molybdenum disulphide, which shows up to 50% polarization.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1882
    DOI: 10.1038/ncomms1882
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    1. Marcin Syperek & Raul Stühler & Armando Consiglio & Paweł Holewa & Paweł Wyborski & Łukasz Dusanowski & Felix Reis & Sven Höfling & Ronny Thomale & Werner Hanke & Ralph Claessen & Domenico Sante & Chr, 2022. "Observation of room temperature excitons in an atomically thin topological insulator," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. Peiming Zheng & Wenya Wei & Zhihua Liang & Biao Qin & Jinpeng Tian & Jinhuan Wang & Ruixi Qiao & Yunlong Ren & Junting Chen & Chen Huang & Xu Zhou & Guangyu Zhang & Zhilie Tang & Dapeng Yu & Feng Ding, 2023. "Universal epitaxy of non-centrosymmetric two-dimensional single-crystal metal dichalcogenides," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    3. A. Aliakbarpour & M. S. Akhoundi Khezrabad & S. Shojaei & S. A. Hashemizadeh-Aghda, 2022. "Optical absorption in lateral transition metal dichalcogenide quantum wells," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 95(10), pages 1-9, October.
    4. 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.
    5. Bumseop Kim & Noejung Park & Jeongwoo Kim, 2022. "Giant bulk photovoltaic effect driven by the wall-to-wall charge shift in WS2 nanotubes," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    6. Jed Kistner-Morris & Ao Shi & Erfu Liu & Trevor Arp & Farima Farahmand & Takashi Taniguchi & Kenji Watanabe & Vivek Aji & Chun Hung Lui & Nathaniel Gabor, 2024. "Electric-field tunable Type-I to Type-II band alignment transition in MoSe2/WS2 heterobilayers," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    7. Shreetu Shrestha & Mingxing Li & Suji Park & Xiao Tong & Donald DiMarzio & Mircea Cotlet, 2023. "Room temperature valley polarization via spin selective charge transfer," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    8. Zhiwen Zhou & E. A. Szwed & D. J. Choksy & L. H. Fowler-Gerace & L. V. Butov, 2024. "Long-distance decay-less spin transport in indirect excitons in a van der Waals heterostructure," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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