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Enhancing and controlling valley magnetic response in MoS2/WS2 heterostructures by all-optical route

Author

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  • Jing Zhang

    (Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University)

  • Luojun Du

    (CAS Key Laboratory of Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences
    Department of Electronics and Nanoengineering, Aalto University)

  • Shun Feng

    (Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University)

  • Run-Wu Zhang

    (Research Laboratory for Quantum Materials, Singapore University of Technology and Design
    Key Lab of advanced optoelectronic quantum architecture and measurement (MOE), Beijing Key Lab of Nanophotonics & ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology)

  • Bingchen Cao

    (Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University)

  • Chenji Zou

    (Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University)

  • Yu Chen

    (Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University)

  • Mengzhou Liao

    (CAS Key Laboratory of Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences)

  • Baile Zhang

    (Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University)

  • Shengyuan A. Yang

    (Research Laboratory for Quantum Materials, Singapore University of Technology and Design)

  • Guangyu Zhang

    (CAS Key Laboratory of Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences
    Songshan Lake Materials Laboratory, Dongguan)

  • Ting Yu

    (Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University)

Abstract

Van der Waals heterostructures of transition metal dichalcogenides with interlayer coupling offer an exotic platform to realize fascinating phenomena. Due to the type II band alignment of these heterostructures, electrons and holes are separated into different layers. The localized electrons induced doping in one layer, in principle, would lift the Fermi level to cross the spin-polarized upper conduction band and lead to strong manipulation of valley magnetic response. Here, we report the significantly enhanced valley Zeeman splitting and magnetic tuning of polarization for the direct optical transition of MoS2 in MoS2/WS2 heterostructures. Such strong enhancement of valley magnetic response in MoS2 stems from the change of the spin-valley degeneracy from 2 to 4 and strong many-body Coulomb interactions induced by ultrafast charge transfer. Moreover, the magnetic splitting can be tuned monotonically by laser power, providing an effective all-optical route towards engineering and manipulating of valleytronic devices and quantum-computation.

Suggested Citation

  • Jing Zhang & Luojun Du & Shun Feng & Run-Wu Zhang & Bingchen Cao & Chenji Zou & Yu Chen & Mengzhou Liao & Baile Zhang & Shengyuan A. Yang & Guangyu Zhang & Ting Yu, 2019. "Enhancing and controlling valley magnetic response in MoS2/WS2 heterostructures by all-optical route," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12128-2
    DOI: 10.1038/s41467-019-12128-2
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