Dresden 2020 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 65: Poster Session Topological Topics
TT 65.6: Poster
Donnerstag, 19. März 2020, 15:00–19:00, P2/EG
Magnetotransport phenomena of the quaternary topological insulator Bi1.5Sb0.5Te1.8Se1.2 — •Erik Zimmermann, Michael Schleenvoigt, Jonas Kölzer, Daniel Rosenbach, Gregor Mussler, Peter Schüffelgen, Hans Lüth, Detlev Grützmacher, and Thomas Schäpers — Forschungszentrum Jülich GmbH
Three-dimensional topological insulators form a new material class which may enable topological quantum computing using robust Majorana states. The interest in ternary and quaternary topological insulators recently increases as the magnetotransport of binary topological insulators is dominated by contributions from the bulk due to intrinsic doping. By varying the stoichiometry, we aim to place the Fermi level into the band gap within the bulk and close to the Dirac point at the surface in order to enhance the contributions from the surface states. We present cryogenic magnetotransport measurements performed on a selective-area grown Bi1.5Sb0.5Te1.8Se1.2 nano-Hallbar, revealing pronounced universal conductance fluctuations caused by the surface states. Furthermore, a unique temperature dependence reinforces that the universal conductance fluctuations originate from two-dimensional transport.