期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 248, 期 3, 页码 732-740出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201046185
关键词
quantum dots; spintronics; spin-orbit coupling; spin polarized transport
资金
- CONICET [PIP 11220080101821]
- ANPCyT [PICT 2006/483, PICT R1776]
We calculate the conductance through a system of three quantum dots (QDs) under two different sets of conditions that lead to spin filtering effects under an applied magnetic field. In one of them, a spin is localized in one QD, as proposed by Delgado et al. [Phys. Rev. Lett. 101, 226810 (2008)]. In the other one, all dots are equivalent by symmetry and the system is subject to a Rashba spin-orbit coupling. We solve the problem using a simple effective Hamiltonian for the low-energy subspace, improving the accuracy of previous results. We obtain that correlation effects related to the Kondo physics play a minor role for parameters estimated previously and high enough magnetic field. Both systems lead to a magnetic field tunable spin valve''. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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