Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 14: Poster: Two-Dimenaional Materials and Topological Insulators
HL 14.18: Poster
Montag, 20. März 2017, 14:00–18:00, P2-OG3
Influence of magnetic doping on the behavior of Bi2Se3 — •Jakub Sebesta, Pavel Balaz, and Karel Carva — Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 3 121 16 Praha 2, Czech Republic
Magnetic doping of topological insulators represents a way which enables us to control transport properties related to the presence of the conducting surface states in these materials. The conducting states are topologically protected while the time symmetry exists there. We can remove it by including a magnetic field that originates for instance from magnetically ordered impurities. In our work we focus on studying physical properties of topological insulators containing magnetic impurities or structural defects by using the ab-initio computations and the simulations of the magnetization dynamic. The basis of our research consists in computing of electronic structures by ab-initio TB-LMTO + CPA calculations, where we are interested in the influence of a doping or defects on the position of the Fermi level or on magnitudes of exchange interactions. In this contribution we show our results achieved in Bi2Se3 which contains Mn impurities or others structural defects. The obtained results are used to simulate a magnetic behavior of magnetic dopants in non-zero temperatures by the Monte-Carlo or spin dynamic simulations to obtain the ordering temperature etc. Also, we compare obtained results with an experiment.