title: Size-dependent spintronic properties of dilute magnetic semiconductor nanocrystals.
abstract: The electronic structure and magnetic properties of Mn-doped Ge, GaAs, and ZnSe nanocrystals are investigated using real space ab initio pseudopotentials constructed within the local spin-density approximation. The ferromagnetic and half-metallicity trends found in the bulk are preserved in the nanocrystals. However, the Mn-related impurity states become much deeper in energy with decreasing nanocrystalline size, causing the ferromagnetic stabilization to be dominated by double exchange via localized holes rather than by a Zener-like mechanism.
authors.affiliation: Department of Chemical Engineering and Materials Science, Institute for the Theory of Advanced Materials in Information Technology, Digital Technology Center, University of Minnesota, Minneapolis, Minnesota 55455, USA.
authors.forename: Xiangyang
authors.initials: X
authors.lastname: Huang
authors.forename: Adi
authors.initials: A
authors.lastname: Makmal
authors.forename: James R
authors.initials: JR
authors.lastname: Chelikowsky
authors.forename: Leeor
authors.initials: L
authors.lastname: Kronik