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

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 > πΓ, U being the charging energy on the dot and Γthe effective resonance width. The bistability properties are discussed in connection with spin-switch effects and logical storage device applications.

to appear on PRB

References in corpus (4)

• Kondo effect in quantum dots coupled to ferromagnetic leads
• Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime
• Nonequilibrium Kondo Effect in a Quantum Dot Coupled to Ferromagnetic Leads
• Zero-conductance resonances and spin-filtering effects in ring conductors subject to Rashba coupling