Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Poster Session - Topological Insulators
O 34.3: Poster
Montag, 16. März 2020, 18:15–20:00, P1C
Topographic and electronic surface characterization of Bi2Te3-derivatives with periodic Mn sub-lattices via STM/STS — christian salazar1, •vladislav nagorkin1, alexander zeugner3, anna isaeva1,2,3, bernd büchner1,2, and christian hess1 — 1Leibniz Institute for Solid State and Materials Research, Dresden, Germany — 2Faculty of Physics, Technische Universität Dresden, Germany — 3Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Germany
Materials combining topological surface states and intrinsic magnetism have gained great attention due to the possibility to be a platform to host tunable topological matter. Here we characterized topographically and spectroscopically two possible candidates through scanning tunneling microscopy. The studied compounds are Bi2Te3-derivatives with periodic Mn sub-lattices, i.e. MnBi2Te4 and MnBi4Te7. The two sample-types are composed on the one hand by only septuple layers (MnBi2Te4), and on the other hand by alternation of Bi2Te3-quintuple and septuple layers (MnBi4Te7). Single crystals of the van der Waals layered materials have been cleaved in cryogenic vacuum at 5 K and subsequently measured. Different characteristic surfaces were identified and spectroscopic data for the different materials and surfaces will be discussed.