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O: Fachverband Oberflächenphysik

O 94: Topology and Symmetry-Protected Materials

O 94.9: Talk

Friday, March 31, 2023, 12:30–12:45, GER 38

Spectroscopic signatures of non-trivial topology in Weyl semimetals — •Jakub Schusser¹, Hendrik Bentmann², Maximilian Ünzelmann¹, Tim Figgemeier¹, Chul-Hee Min³, Simon K. Moser⁴, Jennifer N. Neu⁵, Theo Siegrist⁶, and Friedrich Reinert¹ — ¹Exp. Physik VII and Würzburg-Dresden Cluster of Excellence ct.qmat, JMU Würzburg — ²Center for Quantum Spintronics, NTNU Trondheim — ³Department of Physics, CAU zu Kiel — ⁴Exp. Physik IV and Würzburg-Dresden Cluster of Excellence ct.qmat, JMU Würzburg — ⁵National High Magnetic Field Laboratory, Tallahassee, Florida — ⁶Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida

By performing angle-resolved photoemission spectroscopy (ARPES) on bulk samples we show the spectroscopic manifestation of topological features and Weyl physics beyond the simple photointensity over a broad range of excitation energies from the vacuum ultraviolet to the soft X-Ray regime and compare the surface to the bulk band structure. Our experimental observations were complemented by state-of-the-art first principle photoemission calculations based on one-step model of photoemission. The determinant criterion confirms the arc character of the spoon features in the constant energy contour close to Fermi level in non-centrosymmetric TaP. We further show the drawbacks of the existing spectroscopic techniques used to determine whether the given material has non-zero Chern number and discuss an improved approach for identifying Fermi arcs by the means of differential ARPES measurements as well as the proper final state description.