Spin selective transport through Aharonov-Bohm and Aharonov-Casher triple quantum dot systems
Abstract
We calculate the conductance through a system of three quantum dots 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 quantum dot, 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".
Keywords
Cite
@article{arxiv.1004.0538,
title = {Spin selective transport through Aharonov-Bohm and Aharonov-Casher triple quantum dot systems},
author = {Leandro Tosi and A. A. Aligia},
journal= {arXiv preprint arXiv:1004.0538},
year = {2011}
}
Comments
9 pages, 8 figures, improved presentation and references added, accepted for publication in Physica Status Solidi B