Local moment formation in quantum point contacts
arXiv:cond-mat/0211641 · doi:10.1103/PhysRevLett.90.026804
Abstract
Spin-density-functional theory of quantum point contacts (QPCs) reveals the formation of a local moment with a net of one electron spin in the vicinity of the point contact - supporting the recent report of a Kondo effect in a QPC. The hybridization of the local moment to the leads decreases as the QPC becomes longer, while the onsite Coulomb-interaction energy remains almost constant.
10 pages, 3 figures, accepted for publication in Physical Review Letters