Kondo effect in a semiconductor quantum dot with a spin-accumulated lead.
We study the Kondo effect in a semiconductor quantum dot in contact with a spin-accumulated lead. The spin accmulation in a nonmagnetic semiconductor is realized by spin injection from a spin-polarized quantum point contact in combination with magnetic focusing, thus creating spin-unbalanced chemical potentials. We demonstrate that the spin splitting of the Kondo densities of states (DOS) for spin-up and spin-down electrons can be controlled by selectively shifting only the spin-up DOS using spin accumulation. We also show the possibility to recover the Kondo effect in a high magnetic field, by compensating for Zeeman splitting by spin accumulation.
Kobayashi
T
T
NTT Basic Research Laboratories, Atsugi-shi, Kanagawa 243-0198, Japan.
Tsuruta
S
S
Sasaki
S
S
Fujisawa
T
T
Tokura
Y
Y
Akazaki
T
T