https://doi.org/10.1140/epjb/e2008-00130-1
Spin pump effects on the spin current through two coupled quantum dots
1
Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P.R. China
2
Institute of Applied Physics and Computational Mathematics, Beijing, 100088, P.R. China
3
Atomistix Asia Pacific Pte Ltd, Unit 106, Innovation Center Block 1, 16, NanYang Drive, 637722, Singapore
Corresponding authors: a hpan@buaa.edu.cn - b duan_suqing@iapcm.ac.cn
Received:
6
January
2008
Revised:
2
March
2008
Published online:
28
March
2008
We theoretically study the spin pump effects of the rotating magnetic field on the spin current through two coupled quantum dots. Owing to the interdot coupling, two molecular states with different bands can be formed, resulting asymmetric spin current peaks. The possibility of manipulating the spin current is explored by tuning the strength, the frequency, and the direction of the rotating magnetic field. The number and location of the spin current peaks can be controlled by making use of various tunings. Furthermore, the normal 2π period of the spin current with respect to the magnetic flux can be destroyed by the interdot coupling.
PACS: 73.63.-b – Electronic transport in nanoscale materials and structures / 72.25.Mk – Spin transport through interfaces / 85.75.-d – Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields / 85.65.+h – Molecular electronic devices
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008
