Bipolar spin filter in a quantum dot molecule
Mesoscale and Nanoscale Physics
2009-11-11 v1 Materials Science
Abstract
We show that the tunable hybridization between two lateral quantum dots connected to non-magnetic current leads in a `hanging-dot' configuration that can be used to implement a bipolar spin filter. The competition between Zeeman, exchange interaction, and interdot tunneling (molecular hybridization) yields a singlet-triplet transition of the double dot {\it ground state} that allows spin filtering in Coulomb blockade experiments. Its generic nature should make it broadly useful as a robust bidirectional spin polarizer.
Keywords
Cite
@article{arxiv.cond-mat/0602403,
title = {Bipolar spin filter in a quantum dot molecule},
author = {F. Mireles and E. Cota and F. Rojas and S. E. Ulloa},
journal= {arXiv preprint arXiv:cond-mat/0602403},
year = {2009}
}
Comments
5 pages, 3 figures (to appear in Appl. Phys. Lett.)