Three-terminal triple-quantum-dot ring as a charge and spin current rectifier

TL;DR

This paper theoretically investigates a triple-quantum-dot ring with three terminals, demonstrating its potential as a device that rectifies charge and spin currents driven by spin bias and magnetic flux.

Contribution

It introduces a novel triple-quantum-dot ring with local Rashba spin-orbit interaction as a charge and spin current rectifier, highlighting the control of currents via magnetic flux.

Findings

Spin bias induces charge currents in other terminals with opposite directions.

Magnetic flux enables manipulation of charge and spin currents.

The structure functions as a prototype for charge and spin current rectification.

Abstract

Electronic transport through a triple-quantum-dot ring with three terminals is theoretically studied. By introducing local Rashba spin-orbit interaction on an individual quantum dot, we find that the spin bias in one terminal drives apparent charge currents in the other terminals, accompanied by the similar amplitude and opposite directions of them. Meanwhile, it shows that the characteristics of the spin currents induced by the spin bias are notable. When a magnetic flux is applied through this ring, we see its nontrivial role in the manipulation of the charge and spin currents. With the obtained results, we propose this structure to be a prototype of a charge and spin current rectifier.