Spin-bias driven electron properties of a triple-quantum-dot ring

TL;DR

This paper theoretically investigates how spin bias influences electron transport in a triple-quantum-dot ring, revealing controllable charge and spin currents driven solely by spin bias and structural parameters.

Contribution

It introduces a theoretical model showing spin bias induces charge and spin currents in a quantum-dot ring without charge bias, with tunable properties via structure and magnetic field.

Findings

Charge and spin currents are driven by spin bias without charge bias.

Currents can be controlled by adjusting structure parameters or magnetic field.

Single-spin electron motion can be achieved with an applied charge bias.

Abstract

Electron transport through a three-electrode triple-quantum-dot ring with the source electrode of spin-dependent splitting of chemical potentials (spin bias) is theoretically investigated. We find clear charge and spin currents in the drain electrodes driven by the spin bias, despite the absence of charge bias between the source and drain electrodes, and their directions and amplitudes can be adjusted by altering the structure parameters or magnetic field. The distinct characteristics of spin-bias driven persistent charge and spin currents in the ring are also shown. When an appropriate charge bias is applied, the single-spin electron motion can be achieved in this structure.