The Aharonov-Bohm-Casher ring-dot as a flux-tunable resonant tunneling diode

TL;DR

This paper proposes a mesoscopic ring-dot system with Rashba spin-orbit interaction and Aharonov-Bohm flux as a flux-tunable resonant tunneling diode, demonstrating intrinsic bistability and potential for spin-switch and storage applications.

Contribution

It introduces a novel flux-tunable tunneling diode based on a mesoscopic ring-dot system with spin-orbit interaction, analyzing its bistability and spin-switch properties.

Findings

Intrinsic bistability occurs when 2U > πΓ.

Bistability is linked to spin-switch effects.

Potential applications in logical storage devices.

Abstract

A mesoscopic ring subject to the Rashba spin-orbit interaction and sequentially coupled to an interacting quantum dot, in the presence of Aharonov-Bohm flux, is proposed as a flux tunable tunneling diode. The analysis of the conductance by means of the nonequilibrium Green's function technique, shows an intrinsic bistability at varying the Aharonov-Bohm flux when 2U > \pi \Gamma, U being the charging energy on the dot and \Gamma the effective resonance width. The bistability properties are discussed in connection with spin-switch effects and logical storage device applications.