Rashba-induced transverse pure spin currents in a four-terminal quantum dot ring

Details Rashba-induced transverse pure spin currents in a four-terminal quantum dot ring Rashba-induced transverse pure spin currents in a four-terminal quantum dot ring

2009-01-10

arxiv.org/abs/0901.1367v1

Solid State Communications 149 (2009) 1831

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, Submitted to nanotechnology

Scientific paper

By applying a local Rashba spin-orbit interaction on an individual quantum dot of a four-terminal four-quantum-dot ring and introducing a finite bias between the longitudinal terminals, we theoretically investigate the charge and spin currents in the transverse terminals. It is found that when the quantum dot levels are separate from the chemical potentials of the transverse terminals, notable pure spin currents appear in the transverse terminals with the same amplitude and opposite polarization directions. Besides, the polarization directions of such pure spin currents can be inverted by altering structure parameters, i.e., the magnetic flux, the bias voltage, and the values of quantum dot levels with respect to the chemical potentials of the transverse terminals.

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