Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 74: Topological Insulators
TT 74.12: Vortrag
Donnerstag, 12. März 2026, 12:30–12:45, CHE/0091
Accessing buried topological states: Revealing Dirac cones with ferromagnetic resonance — Laura Pietanesi1, •Magdalena Marganska2,3, Thomas Mayer2, Michael Barth3, Lin Chen1, Ji Zou4, Adrian Weindl2, Alexander Liebig2, Rebeca Diaz-Pardo1, Dhavala Suri1,5, Florian Schmid2, Franz Giessibl2, Klaus Richter2, Yaroslav Tserkovnyak4, Matthias Kronseder2, and Christian Back1 — 1Technical University of Munich, Germany — 2University of Regensburg, Germany — 3Wrocław University of Science and Technology, Poland — 4University of California, Los Angeles, USA — 5Indian Institute of Science, Bengaluru, India
Ferromagnetic resonance is used to reveal features of the buried electronic band structure at interfaces between ferromagnetic metals and topological insulators [1]. The evolution of magnetic damping in a hybrid ferromagnet/3D topological insulator structure reveals a clear fingerprint of the Dirac point with additional features. The high energy resolution of this method allows us to resolve the energetic shift of the local Dirac points due to local variations of the electrostatic potential. The underlying spin-pumping mechanism relies on the dissipation of angular momentum by topological surface states (TSSs). Tuning of the Fermi level within the TSS was verified both by varying the stoichiometry of the 3DTI layer and by electrostatic backgating with a remarkable agreement. Calculations based on the chiral tunneling process naturally occurring in TSSs agree well with the experimental results.
[1] PRB 109, 064424 (2024)
Keywords: chiral tunneling; 3D topological insulators; ferromagnetic resonance; spin pumping