Spin Ordering on the Surface of a Topological Insulator with Magnetic Ions

V.N. Men'shov; V.V. Tugushev; E.V. Chulkov

doi:10.4028/www.scientific.net/SSP.190.494

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HomeSolid State PhenomenaSolid State Phenomena Vol. 190Spin Ordering on the Surface of a Topological...

Spin Ordering on the Surface of a Topological Insulator with Magnetic Ions

Abstract:

We study the effect of magnetic doping on appearance of ferromagnetic (FM) order on the surface of a three-dimensional topological insulator. Assuming the exchange coupling of the Dirac fermions with the dilute magnetic ions, we find that the system under consideration is unstable with respect to a spontaneous uniform magnetization along the out-of-plane direction. The appearance of the magnetization is accompanied by opening of a gap in the spectrum of surface states. In the framework of a mean-field approach, we analyze the possibility of the FM order on the magnetically doped surface of topological insulator at different temperatures and positions of the chemical potential.

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Periodical:

Solid State Phenomena (Volume 190)

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494-497

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https://doi.org/10.4028/www.scientific.net/SSP.190.494

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Online since:

June 2012

Authors:

V.N. Men'shov, V.V. Tugushev, E.V. Chulkov

Keywords:

Ferromagnetic Order, Magnetic Impurity, Surface States, Topological Insulator

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