Spin-polarized current in double quantum dots

doi:10.1088/1674-1056/21/11/117201

Abstract We analyze the transport through an asymmetric double quantum dots with an inhomogeneous Zeeman splitting in the presence of crossed dc and ac magnetic fields. A strong spin-polarized current can be obtained by changing the dc magnetic field. It is mainly due to the resonant tunneling. But for the ferromagnetic right electrode, the electron spin resonance also plays an important role in transport. We show that the double quantum dots with three-level mixing under crossed dc and ac magnetic fields can act not only as a bipolar spin filter but also as a spin inverter under suitable conditions.

Keywords: resonant tunneling spin-polarized current spin filter double quantum dots

Received: 04 March 2012
Revised: 03 May 2012
Accepted manuscript online:

PACS:	72.25.Dc	(Spin polarized transport in semiconductors)
	73.23.Hk	(Coulomb blockade; single-electron tunneling)
	73.63.Kv	(Quantum dots)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10874020 and 11174042), the National Basic Research Program of China (Grants No. 2011CB922204), the CAEP, China (Grant No. 2011B0102024), and the SRF for ROCS, SEM, China.

Corresponding Authors: Li Ai-Xian
E-mail: liaixian0123@sina.com

Cite this article:

Li Ai-Xian (李爱仙), Duan Su-Qing (段素青 ) Spin-polarized current in double quantum dots 2012 Chin. Phys. B 21 117201

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