Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 2: Topological Insulators 1 (jointly with DS, MA, HL, O) (joint session TT/HL)

HL 2.8: Vortrag

Montag, 16. März 2020, 11:30–11:45, HSZ 03

Electronic structure and properties of the surface of TlBiSe₂ in dependence on the coverage by Fe — •Svitlana Polesya¹, Sergiy Mankovsky¹, Alexander Liebig², Franz Giessibl², and Hubert Ebert¹ — ¹Dept. Chemistry, LMU Munich, Butenandtstrasse 11, D-81377 Munich, Germany — ²Inst. Expt. and Appl. Physics, University Regensburg, Regensburg, Germany

We will present the results of investigations on the electronic structure of the surface of of the topological insulator TlBiSe₂ with different terminations by means of the tight binding KKR band structure method (TB KKR). The appearance of the topologically protected surface states at the Γ point is found in agreement with ARPES experiment. The modification of these states due to Fe adatoms deposited on top of the surface having different terminations, was investigated as a function of the degree of surface coverage by Fe. This study was performed via the CPA (Coherent Potential Approximation) alloy theory, assuming random occupation of the surface positions by Fe. The exchange coupling parameters have been calculated for different amount of Fe atoms covering the surface in order to determine the magnetic structure of the Fe overlayer, that can be probed by STM experiments.