Spin-polarized currents in double and triple quantum dots driven by ac magnetic fields

Details Spin-polarized currents in double and triple quantum dots driven by ac magnetic fields Spin-polarized currents in double and triple quantum dots driven by ac magnetic fields

2010-10-13

arxiv.org/abs/1010.2729v2

Phys. Rev. B 82, 205304 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 7 figures, published version

Scientific paper

10.1103/PhysRevB.82.205304

We analyze transport through both a double quantum dot and a triple quantum dot with inhomogeneous Zeeman splittings in the presence of crossed dc and ac magnetic fields. We find that strongly spin-polarized current can be achieved by tuning the relative energies of the Zeeman-split levels of the dots, by means of electric gate voltages: depending on the energy level detuning, the double quantum dot works either as spin-up or spin-down filter. We show that a triple quantum dot in series under crossed dc and ac magnetic fields can act not only as spin-filter but also as spin-inverter.

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