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| Paper IPM / Physic / 14845 |
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We address the electronic structure of the surface states of topological-insulator thin films with embedded local nonmagnetic and magnetic impurities. Using the T-matrix expansion of the real-space Green's function, we derive the local density of electron states and corresponding spin-resolved densities. We show that the effects of the impurities can be tuned by applying an electric field between the surface layers. The emerging magnetic states are expected to play an important role both in the ferromagnetic mechanism of magnetic topological insulators and in its transport properties. In the case of magnetic impurities, we have categorized the possible cases for different spin directions of the impurities as well as the spin direction in which the spin-resolved density of electron states is calculated and have related them to the spin susceptibility of the system.
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