We propose a Rashba spin valve that exhibits an exceptionally high on-off ratio without relying on magnetic fields or magnetic materials, unlike conventional designs. Remarkably, the device achieves a desired “off” state by inducing opposite Rashba spin textures in different regions through opposite electric fields, a phenomenon arising from the mismatch of Rashba-Bloch states. Theoretical analysis is conducted using a generalized two-dimensional (2D) Rashba model. We delve deeper into non-Dirac 2D electron gas and Dirac material candidates such as graphene, ${\mathrm{WTe}}_2$, and black arsenic, and discuss their potential for realizing the concept under weak disorder. Our proposal offers a highly efficient all-electrical approach to designing spin switches for spin logic circuits, and suggests an ultralow dissipation architecture for emerging spintronic neural systems.

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• Rashba coupling
• Spintronics
• 2-dimensional systems
• Artificial neural networks
• Devices for digital logic, storage & processing
• Spin valves
• Green's function methods
• Landauer formula