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Observation of intervalley quantum interference in epitaxial monolayer tungsten diselenide

Author

Listed:
  • Hongjun Liu

    (The University of Hong Kong)

  • Jinglei Chen

    (The University of Hong Kong)

  • Hongyi Yu

    (The University of Hong Kong
    Center of Theoretical and Computational Physics, The University of Hong Kong)

  • Fang Yang

    (Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai Jiao Tong University)

  • Lu Jiao

    (The University of Hong Kong)

  • Gui-Bin Liu

    (School of Physics, Beijing Institute of Technology)

  • Wingking Ho

    (The University of Hong Kong)

  • Chunlei Gao

    (Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai Jiao Tong University
    Innovation Center of Advanced Microstructures)

  • Jinfeng Jia

    (Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai Jiao Tong University
    Innovation Center of Advanced Microstructures)

  • Wang Yao

    (The University of Hong Kong
    Center of Theoretical and Computational Physics, The University of Hong Kong)

  • Maohai Xie

    (The University of Hong Kong)

Abstract

The extraordinary electronic structures of monolayer transition metal dichalcogenides, such as the spin–valley-coupled band edges, have sparked great interest for potential spintronic and valleytronic applications based on these two-dimensional materials. In this work, we report the experimental observation of quasi-particle interference patterns in monolayer WSe2 using low-temperature scanning tunnelling spectroscopy. We observe intervalley quantum interference involving the Q valleys in the conduction band due to spin-conserving scattering processes, while spin-flipping intervalley scattering is absent. Our results establish unequivocally the presence of spin–valley coupling and affirm the large spin splitting at the Q valleys. Importantly, the inefficient spin-flipping scattering implies long valley and spin lifetime in monolayer WSe2, which is a key figure of merit for valley-spintronic applications.

Suggested Citation

  • Hongjun Liu & Jinglei Chen & Hongyi Yu & Fang Yang & Lu Jiao & Gui-Bin Liu & Wingking Ho & Chunlei Gao & Jinfeng Jia & Wang Yao & Maohai Xie, 2015. "Observation of intervalley quantum interference in epitaxial monolayer tungsten diselenide," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9180
    DOI: 10.1038/ncomms9180
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