A scheme for spin transistor with extremely large on/off current ratio

TL;DR

This paper proposes a quantum wire-based spin transistor utilizing periodic Rashba spin-orbit coupling, achieving extremely high on/off current ratios through quantum interference effects, even under disorder conditions.

Contribution

It introduces a novel spin transistor design with periodic Rashba coupling that significantly enhances on/off ratios via quantum interference effects.

Findings

Achieves large on/off current ratios through Fano-Rashba quantum interference.

Demonstrates robustness of the device performance under strong disorder.

Provides a new approach for high-performance spin field-effect transistors.

Abstract

Quantum wires with periodic local Rashba spin-orbit couplings are proposed for a higher performance of spin field-effect transistor. Fano-Rashba quantum interference due to the spin-dependent modulated structure gives rise to a broad energy range of vanishingly small transmission. Tuning Rashba spin-orbit couplings can provide the on- or off-currents with extremely large on/off current ratios even in the presence of a strong disorder.