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Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 74: Topological Insulators

TT 74.4: Vortrag

Donnerstag, 21. März 2024, 15:45–16:00, H 3005

Optical spectroscopy study of the magnetic topological insulators Mn(Bi1−xSbx)2Te4 at ambient and high pressure — •M. Köpf1, S. H. Lee2,3, Z. Q. Mao2,3,4, and C. A. Kuntscher11Experimentalphysik II, Institute of Physics, Augsburg University, 86159 Augsburg, Germany — 22D Crystal Consortium, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA — 3Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA — 4Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA

The magnetic topological insulator MnBi2Te4 and the related materials Mn(Bi1−xSbx)2Te4 are promising candidates for the realization of rare quantum mechanical effects due to the coexistence of topological surface states and magnetic ordering. We studied the optical response of Mn(Bi1−xSbx)2Te4 with various Sb doping levels x at ambient and under hydrostatic pressure. Both Sb doping and pressure application cause strong effects on the electronic band structure, strongly influencing the free charge carrier dynamics, according to infrared reflectivity measurements. In the Sb-doped compounds the metallic strength decreases from x=0 to x=0.26, followed by an increase for higher x. Under hydrostatic pressure, MnBi2Te4 and the least metallic material Mn(Bi0.74Sb0.26)2Te4 (x=0.26) show an unusual decrease in metallic character up to ∼10 GPa.

Keywords: magnetic topological insulator; infrared spectroscopy; high pressure; charge carrier dynamics

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