Journal
JETP LETTERS
Volume 94, Issue 8, Pages 629-634Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364011200100
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Funding
- Russian Foundation for Basic Research [10-02-00118-a]
- Donostia International Physics Center (DIPC)
- Department of Education of the Basque Country Government
- University of the Basque Country [GV-UPV/EHU, IT-366-07]
- Ministerio de Ciencia e Inovacion [FIS2010-19609-C02-01]
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We study the effect of magnetic doping at the surface of a three dimensional topological insulator (TI) on emergence of ferromagnetic ordering at the TI-surface assuming the exchange coupling between the Dirac fermions and the dilute magnetic ions. We show that this coupling results in an uniaxial magnetic anisotropy with out-of-plane magnetization direction. It is found that the system under consideration is unstable with respect to a spontaneous uniform magnetization along the easy axis, which is accompanied by opening a gap in a spectrum of the Dirac surface states. In the framework of a mean-field approach, we study the possibility of ferromagnetic order on the magnetically doped surface of TI at different temperatures and positions of the chemical potential.
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