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Strong interface-induced spin–orbit interaction in graphene on WS2

Author

Listed:
  • Zhe Wang

    (University of Geneva)

  • Dong–Keun Ki

    (University of Geneva)

  • Hua Chen

    (The University of Texas at Austin)

  • Helmuth Berger

    (Institut de Physique de la Matière Complexe, Ecole Polytechnique Federale de Lausanne)

  • Allan H. MacDonald

    (The University of Texas at Austin)

  • Alberto F. Morpurgo

    (University of Geneva)

Abstract

Interfacial interactions allow the electronic properties of graphene to be modified, as recently demonstrated by the appearance of satellite Dirac cones in graphene on hexagonal boron nitride substrates. Ongoing research strives to explore interfacial interactions with other materials to engineer targeted electronic properties. Here we show that with a tungsten disulfide (WS2) substrate, the strength of the spin–orbit interaction (SOI) in graphene is very strongly enhanced. The induced SOI leads to a pronounced low-temperature weak anti-localization effect and to a spin-relaxation time two to three orders of magnitude smaller than in graphene on conventional substrates. To interpret our findings we have performed first-principle electronic structure calculations, which confirm that carriers in graphene on WS2 experience a strong SOI and allow us to extract a spin-dependent low-energy effective Hamiltonian. Our analysis shows that the use of WS2 substrates opens a possible new route to access topological states of matter in graphene-based systems.

Suggested Citation

  • Zhe Wang & Dong–Keun Ki & Hua Chen & Helmuth Berger & Allan H. MacDonald & Alberto F. Morpurgo, 2015. "Strong interface-induced spin–orbit interaction in graphene on WS2," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9339
    DOI: 10.1038/ncomms9339
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    Cited by:

    1. Qing Rao & Wun-Hao Kang & Hongxia Xue & Ziqing Ye & Xuemeng Feng & Kenji Watanabe & Takashi Taniguchi & Ning Wang & Ming-Hao Liu & Dong-Keun Ki, 2023. "Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. B. G. Márkus & M. Gmitra & B. Dóra & G. Csősz & T. Fehér & P. Szirmai & B. Náfrádi & V. Zólyomi & L. Forró & J. Fabian & F. Simon, 2023. "Ultralong 100 ns spin relaxation time in graphite at room temperature," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    3. Lihuan Sun & Louk Rademaker & Diego Mauro & Alessandro Scarfato & Árpád Pásztor & Ignacio Gutiérrez-Lezama & Zhe Wang & Jose Martinez-Castro & Alberto F. Morpurgo & Christoph Renner, 2023. "Determining spin-orbit coupling in graphene by quasiparticle interference imaging," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    4. Prasanna Rout & Nikos Papadopoulos & Fernando Peñaranda & Kenji Watanabe & Takashi Taniguchi & Elsa Prada & Pablo San-Jose & Srijit Goswami, 2024. "Supercurrent mediated by helical edge modes in bilayer graphene," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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