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Title: Electron-mediated Ferromagnetism and Negative s-d Exchange Splitting in Semiconductors

Abstract

Several approaches are proposed to enhance the spin splitting at the conduction band edge and consequently induce free-electron-mediated stabilization of ferromagnetic semiconductors. We show that kinetic s-d coupling can be introduced through chemical ordering and/or strain. We find that quantum confinement has a large effect on the spin splitting at the conduction band edge. It can effectively reverse the sign of the conduction band splitting, thus, shedding light on the recent puzzling experimental observation that s-d exchange splitting is negative in semiconductor superlattices. Finally, we show that, using rare-earth elements as magnetic dopants, the symmetry-allowed s-f coupling can lead to a large splitting at the conduction band edge.

Authors:
;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
976972
DOE Contract Number:
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 2006; Related Information: Article No. 245204
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CONFINEMENT; FERROMAGNETISM; KINETICS; SPIN; STABILIZATION; SUPERLATTICES; Materials Science and Semiconductors

Citation Formats

Dalpian, G. M., and Wei, S.-H. Electron-mediated Ferromagnetism and Negative s-d Exchange Splitting in Semiconductors. United States: N. p., 2006. Web. doi:10.1103/PhysRevB.73.245204.
Dalpian, G. M., & Wei, S.-H. Electron-mediated Ferromagnetism and Negative s-d Exchange Splitting in Semiconductors. United States. doi:10.1103/PhysRevB.73.245204.
Dalpian, G. M., and Wei, S.-H. Sun . "Electron-mediated Ferromagnetism and Negative s-d Exchange Splitting in Semiconductors". United States. doi:10.1103/PhysRevB.73.245204.
@article{osti_976972,
title = {Electron-mediated Ferromagnetism and Negative s-d Exchange Splitting in Semiconductors},
author = {Dalpian, G. M. and Wei, S.-H.},
abstractNote = {Several approaches are proposed to enhance the spin splitting at the conduction band edge and consequently induce free-electron-mediated stabilization of ferromagnetic semiconductors. We show that kinetic s-d coupling can be introduced through chemical ordering and/or strain. We find that quantum confinement has a large effect on the spin splitting at the conduction band edge. It can effectively reverse the sign of the conduction band splitting, thus, shedding light on the recent puzzling experimental observation that s-d exchange splitting is negative in semiconductor superlattices. Finally, we show that, using rare-earth elements as magnetic dopants, the symmetry-allowed s-f coupling can lead to a large splitting at the conduction band edge.},
doi = {10.1103/PhysRevB.73.245204},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 2006,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}