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TT: Fachverband Tiefe Temperaturen

TT 35: Topology: Poster

TT 35.3: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P3

Bulk and surface electron scattering in disordered Bi₂Te₃ probed by quasiparticle interference — •Vladislav Nagorkin^1,2, Sebastian Schimmel^1,2, Paul Gebauer³, Anna Isaeva^1,4,5,6, Danny Baumann¹, Andreas Koitzsch¹, Bernd Büchner^1,3, and Christian Hess^1,2 — ¹IFW Dresden, Germany — ²Bergische Universität Wuppertal, Germany — ³TU Dresden, Germany — ⁴University of Amsterdam, The Netherlands — ⁵TU Dortmund, Germany — ⁶Research Center "Future Energy Materials and Systems", UA Ruhr, Germany

We present low temperature scanning tunneling microscopy and spectroscopy studies of the electronic properties of the topological insulator Bi₂Te₃. The high-resolution differential conductance maps were measured in a relatively large energy range and allowed to reveal the quasiparticle interference in this material. We interpret our experimental data by comparing them with the modeled quasiparticle interference patterns with the use of the spin-selective joint density of states approach including the intricate three-dimensional spin texture of this material. Based on that, the topological properties are clearly demonstrated by the linear energy dispersion of the dominant scattering vector and the absence of the backscattering. In addition, non-dispersive scattering modes were detected and interpreted by scattering involving both surface and bulk states. This allowed us to approximate the bulk energy gap range in our samples. Finally, we show that the abovementioned findings are robust against the external magnetic field of magnitude up to 15 T.

Keywords: topological insulators; scanning tunneling microscopy and spectroscopy; quasiparticle interference; density of states; electronic band structure