Magnetic Moment Formation in Quantum Point Contacts
Mesoscale and Nanoscale Physics
2007-05-23 v1 Strongly Correlated Electrons
Abstract
We study the formation of local magnetic moments in quantum point contacts. Using a Hubbard-like model to describe point contacts formed in a two dimensional system, we calculate the magnetic moment using the unrestricted Hartree approximation. We analyze different type of potentials to define the point contact, for a simple square potential we calculate a phase diagram in the parameter space (Coulomb repulsion - gate voltage). We also present an analytical calculation of the susceptibility to give explicit conditions for the occurrence of a local moment, we present a simple scaling argument to analyze how the stability of the magnetic moment depends on the point contact dimensions.
Keywords
Cite
@article{arxiv.cond-mat/0411053,
title = {Magnetic Moment Formation in Quantum Point Contacts},
author = {P. S. Cornaglia and C. A. Balseiro and M. Avignon},
journal= {arXiv preprint arXiv:cond-mat/0411053},
year = {2007}
}
Comments
7 pages, 2 figures