Size-dependent spintronic properties of dilute magnetic semiconductor nanocrystals

Xiangyang Huang, Adi Makmal, James R. Chelikowsky, Leeor Kronik

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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.

Original languageEnglish
Article number236801
JournalPhysical Review Letters
Issue number23
StatePublished - 17 Jun 2005
Externally publishedYes


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