Tunable pure spin currents in a triple-quantum-dot ring

Details Tunable pure spin currents in a triple-quantum-dot ring Tunable pure spin currents in a triple-quantum-dot ring

2008-08-07

arxiv.org/abs/0808.0950v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 Figures

Scientific paper

10.1063/1.2838310

Electron transport properties in a triple-quantum-dot ring with three terminals are theoretically studied. By introducing local Rashba spin-orbit interaction on an individual quantum dot, we calculate the charge and spin currents in one lead. We find that a pure spin current appears in the absence of a magnetic field. The polarization direction of the spin current can be inverted by altering the bias voltage. In addition, by tuning the magnetic field strength, the charge and spin currents reach their respective peaks alternately.

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