Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 35: Topology: Poster
TT 35.3: Poster
Wednesday, March 19, 2025, 15:00–18:00, P3
Bulk and surface electron scattering in disordered Bi2Te3 probed by quasiparticle interference — •Vladislav Nagorkin1,2, Sebastian Schimmel1,2, Paul Gebauer3, Anna Isaeva1,4,5,6, Danny Baumann1, Andreas Koitzsch1, Bernd Büchner1,3, and Christian Hess1,2 — 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