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On the efforts of enhancing the spin orbit interaction (SOI) of graphene forseeking the dissipationless quantum spin Hall devices, unique Kane-Mele typeSOI and high mobility samples are desired. However, common external decorationoften introduces extrinsic Rashba-type SOI and simultaneous impurityscattering. Here we show, by the EDTA-Dy molecule decorating, the Kane-Meletype SOI is mimicked with even improved carrier mobility. It is evidenced bythe suppressed weak localization at equal carrier densities and simultaneousElliot-Yafet spin relaxation. The extracted spin scattering time ismonotonically dependent on the carrier elastic scattering time, where theElliot-Yafet plot gives the interaction strength of 3.3 meV. Improved quantumHall plateaus can be even seen after the external operation. This is attributedto the spin-flexural phonon coupling induced by the enhanced graphene ripples,as revealed by the in-plane magnetotransport measurement.

Mimicing the Kane-Mele type spin orbit interaction by spin-flexual phonon coupling in graphene devices