Magnetic impurity states and ferromagnetic interaction in diluted magnetic semiconductors

M. Ichimura, K. Tanikawa, S. Takahashi, G. Baskaran, S. Maekawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

The electronic structure of diluted magnetic semiconductors is studied, especially focusing on the hole character. The Haldane-Anderson model is extend to a magnetic impurity, and is analyzed in the Hartree-Fock approximation. Due to the strong hybridization of an impurity d-states with host p-states, it is shown that holes are created in the valence band, at the same time the localized magnetic moments are formed. These holes are weakly bound around the impurity site with the characteristic length of several lattice constants. For the case of the two impurities, it is found that when the separation of two impurities is of the order of the length of holes, the overlap of these holes favors the ferromagnetic interaction. The spatially extended holes play an essential role for the ferromagnetic exchange interaction.

Original languageEnglish
Title of host publicationProceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages183-186
Number of pages4
ISBN (Print)9812568581, 9789812568588
DOIs
Publication statusPublished - 2006 Jan 1
Event8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005 - Hatoyama, Saitama, Japan
Duration: 2005 Aug 222005 Aug 25

Publication series

NameProceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005

Other

Other8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
CountryJapan
CityHatoyama, Saitama
Period05/8/2205/8/25

Keywords

  • Diluted magnetic semiconductors
  • Haldane-anderson model
  • Hartree-fock approximation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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