Carrier mediated ferromagnetism on the surface of a topological insulator |
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Authors: | V N Men’shov V V Tugushev E V Chulkov |
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Institution: | 1.National Research Centre Kurchatov Institute,Moscow,Russia;2.Departamento de Física de Materiales, Facultad de Ciencias Químicas, UPV/EHU and Centro de Física de Materiales CFM-MPC,Centro Mixto CSIC-UPV/EHU,San Sebastián, Basque Country,Spain |
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Abstract: | 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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Keywords: | |
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