Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Topology and symmetry protected materials & Topological insulators (joint session O/HL/TT)
O 63.4: Vortrag
Mittwoch, 11. März 2026, 15:45–16:00, HSZ/0401
Quantifying quasiparticle chirality in a chiral topological semimetal — •Jiaju Wang1, Amit Kumar1, Markel Pardo-Almanza1, Jaime Sanchez-Barriga2, Jorge Cardenas-Gamboa3, Maia Vergniory3, Vladimir Strokov4, Moritz Hoesch5, Chandra Shekhar6, Claudia Felser6, Stuart Parkin1, and Niels Schröter1 — 1Max Planck Institute of Microstructure Physics, Halle (Saale), Germany — 2Helmholtz-Zentrum Berlin, Berlin, Germany — 3Donostia International Physics Center, San Sebastián, Spain — 4Paul Scherrer Institute, Villigen, Switzerland — 5Deutsches Elektronen-Synchrotron, Hamburg, Germany — 6Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Recently, electron chirality has been proposed as an order parameter to quantify chirality. In chiral topological semimetals with the B20 structure, electron chirality is linked to parallel spin-momentum locking (SML) and spin deviations from SML, which affects numerous physical properties. However, experimental quantification of spin deviation still remains a big challenge. To achieve this, we have used spin and angle-resolved photoemission spectroscopy to directly probe the spin texture of Weyl cones in RhSi, a chiral topological semimetal with strong spin-orbit coupling (SOC). The spin-resolved spectra at different azimuthal angles are intricately fitted to extract numerical values of spin deviation for Weyl cones, allowing us to calculate the normalized electron chirality density (NECD). It was found that deviations can decrease the NECD from 1 down to 0.8. This observation may help interpret physical phenomena in chiral topological semimetals.
Keywords: chiral topological semimetal; spin and angle resolved photoemission spectroscopy; spin-orbit coupling; spin-momentum locking; spin texture