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

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

2008-05-18

arxiv.org/abs/0805.2715v1

Phys. Rev. B 77, 193309 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear on PRB

Scientific paper

10.1103/PhysRevB.77.193309

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.

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