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Synthetic Rashba spin–orbit system using a silicon metal-oxide semiconductor


The spin–orbit interaction (SOI), mainly manifesting itself in heavy elements and compound materials, has been attracting much attention as a means of manipulating and/or converting a spin degree of freedom. Here, we show that a Si metal-oxide- semiconductor (MOS) heterostructure possesses Rashba-type SOI, although Si is a light element and has lattice inversion symmetry resulting in inherently negligible SOI in bulk form. When a strong gate electric field is applied to the Si MOS, we observe spin lifetime anisotropy of propagating spins in the Si through the formation of an emergent effective magnetic field due to the SOI. Furthermore, the Rashba parameter α in the system increases linearly up to 9.8 × 10−16 eV m−1 for a gate electric field of 0.5 V nm−1; that is, it is gate tuneable and the spin splitting of 0.6 μeV is relatively large. Our finding establishes a family of spin–orbit systems.

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Fig. 1: Device structure and basic charge and spin transport characteristics in a synthetic Rashba system made of Si MOS.
Fig. 2: Gate modulation of spin precession signals and spin lifetime anisotropy.
Fig. 3: Gate voltage dependence of the spin lifetime anisotropy.
Fig. 4: Physics behind the spin lifetime anisotropy, the Rashba SOI and the emergent effective magnetic field in the Si MOS, and the gate-tuneable Rashba parameter.

Data availability

Source data for the main paper figures are provided with this paper. Additional data are available from the corresponding authors on request.


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This research is supported in part by the Japan Society for the Promotion of Science (JSPS) Research Fellow Program (grant no. 18J22869), JST-PRESTO ‘Information Carrier’ Program and a Grant-in-Aid for Scientific Research (S) ‘Semiconductor Spincurrentronics’ (grant no. 16H06330).

Author information




M.S. and S.L. conceived the experiments. H.K., M.G., S.M. and Y.S. fabricated samples. S.L. and N.Y. collected data. S.L., R.O., E.S., Y.A. and M.S. analysed the results. M.S. and S.L. wrote the paper. All authors discussed the results.

Corresponding author

Correspondence to Masashi Shiraishi.

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The authors declare no competing interests.

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Peer review information Nature Materials thanks Juan-Carlos Rojas-Sánchez and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary information

Supplementary Information

Supplementary Figs. 1–6, Refs. 1–5 and Discussion.

Source data

Source Data Fig. 1

Source data for Fig. 1

Source Data Fig. 2

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Source Data Fig. 3

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Source Data Fig. 4

Source data for Fig. 4

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Lee, S., Koike, H., Goto, M. et al. Synthetic Rashba spin–orbit system using a silicon metal-oxide semiconductor. Nat. Mater. (2021).

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