Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.73: Poster

Donnerstag, 8. September 2022, 16:00–18:00, P4

Magneto-transport in (Bi,Sb)Te nanostructures — •Titouan Charvin^1,2, Felix Hansen², Silke Hampel², Joseph Dufouleur², Bernd Büchner^2,3, and Romain Giraud^1,2 — ¹Université Grenoble Alpes, CNRS, CEA, IRIG/Spintec, F-38000 Grenoble, France — ²Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany — ³Institut für Festkörperphysik, TU Dresden, D-01062 Dresden, Germany

The investigation of Dirac fermions surface states in binary 3D topological insulators, such as Bi₂Te₃ or Sb₂Te₃, is limited by their large bulk-carrier densities. This shift of the Fermi level, away from the bulk band gap, is caused by a high density of point defects, acting as donors or acceptors. With the aim to achieve a bulk-charge compensation, we grew (Bi_xSb_1−x)₂Te₃ nanostructures by chemical vapor transport, with different stoichiometries, in order to vary both the band structure and the relative contributions of different types of point defects. From magneto-transport measurements, we infer the bulk and surface carrier densities and mobilities. Although the bulk contribution to the conductivity can be reduced for some stoichiometries, all samples show a metallic-like behavior of their conductivities, with coexisting bulk and surface states contributions.