Spontaneous spin polarized tunneling current through a quantum dot array
Mesoscale and Nanoscale Physics
2007-05-23 v1
Abstract
We show theoretically that a strongly spin-polarized current can be generated in semiconductors by taking advantage of the ferromagnetic phase of a quantum dot array (QDA). A Hubbard model with coupling to leads is used to study the tunneling current of the QDA system as a function of gate voltage. Due to the weak interdot coupling and strong Coulomb repulsion, it is found that a ferromagnetic phase exists in QDA within a window of gate voltage. Therefore QDA can be used as a spin filter to detect and control spin states in quantum information devices.
Cite
@article{arxiv.cond-mat/0209499,
title = {Spontaneous spin polarized tunneling current through a quantum dot array},
author = {David M. -T. Kuo and Y. -C. Chang},
journal= {arXiv preprint arXiv:cond-mat/0209499},
year = {2007}
}
Comments
3 pages, 2 figures