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Impurity scattering on the surface of topological-insulator thin films
Damghan Univ, Sch Phys, POB 36716-41167, Damghan, Iran..
IPM, Inst Res Fundamental Sci, Sch Phys, Tehran 193955531, Iran..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Damghan Univ, Sch Phys, POB 36716-41167, Damghan, Iran..
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 23, 235429Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 95, no 23, 235429
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-329646DOI: 10.1103/PhysRevB.95.235429ISI: 000404018700005OAI: oai:DiVA.org:uu-329646DiVA: diva2:1143488
Funder
Swedish Research Council
Available from: 2017-09-21 Created: 2017-09-21 Last updated: 2017-11-29Bibliographically approved

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