Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-04
Phys. Status Solidi B 248, No. 3, 732-740 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 8 figures, improved presentation and references added, accepted for publication in Physica Status Solidi B
Scientific paper
10.1002/pssb.201046185
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".
Aligia Armando A.
Tosi Leandro
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