Highly Confined Spin-Polarized Two-Dimensional Electron Gas in SrTiO3/SrRuO3 Superlattices

[en] We report first-principles characterization of the structural and electronic properties of (SrTiO3)5/(SrRuO3)1 superlattices. We show that the system exhibits a spin-polarized two-dimensional electron gas, extremely confined to the 4d orbitals of Ru in the SrRuO3 layer. Every interface in the superlattice behaves as a minority-spin half-metal ferromagnet, with a magnetic moment of µ = 2.0µB/SrRuO3 unit. The shape of the electronic density of states, half-metallicity, and magnetism are explained in terms of a simplified tight-binding model, considering only the t2g orbitals plus (i) the bidimensionality of the system and (ii) strong electron correlations.

Disciplines :

Physics

Author, co-author :

Verissimo-Alves, M.

Garcia-Fernandez, P.

Bilc, Daniel ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Junquera, J.

Language :

English

Title :

Highly Confined Spin-Polarized Two-Dimensional Electron Gas in SrTiO3/SrRuO3 Superlattices

Publication date :

2012

Journal title :

Physical Review Letters

ISSN :

0031-9007

eISSN :

1079-7114

Publisher :

American Physical Society, Ridge, United States - New York

Volume :

108

Pages :

107003

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 19 March 2012

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