Competing mechanisms for singlet-triplet transition in artificial molecules
Mesoscale and Nanoscale Physics
2009-11-10 v1
Abstract
We study the magnetic field induced singlet/triplet transition for two electrons in vertically coupled quantum dots by exact diagonalization of the Coulomb interaction. We identify the different mechanisms occurring in the transition, involving either in-plane correlations or localization in opposite dots, depending on the field direction. Therefore, both spin and orbital degrees of freedom can be manipulated by field strength and direction. The phase diagram of realistic devices is determined.
Keywords
Cite
@article{arxiv.cond-mat/0405187,
title = {Competing mechanisms for singlet-triplet transition in artificial molecules},
author = {Devis Bellucci and Massimo Rontani and Filippo Troiani and Guido Goldoni and Elisa Molinari},
journal= {arXiv preprint arXiv:cond-mat/0405187},
year = {2009}
}
Comments
To appear in Phys. Rev. B - Rapid Comm. - 5 pages, 3 figures