We present a new strategy to amplify the spin-orbit coupling (SOC) effect in a simple metal-based polar superlattices with light elements to create a giant Rashba SOC up to ${\alpha }_R\approx 3.80$ eV Å with negative sign. First-principles calculations demonstrate that the giant ${\alpha }_R$ originates from optimizing the internal electric field, which comes from the polarity, charge transfer, and superlattice systems. This strategy provides an effective way to design a next-generation spintronics device without the use of heavy elements.

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• Rashba coupling
• Spin generation
• Spintronics
• Solid-solid interfaces
• First-principles calculations