Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Topological Semimetals

TT 25.10: Talk

Thursday, September 8, 2022, 12:15–12:30, H3

Raman Spectroscopy with Twisted Light on Chiral Semimetal PdGa — •Florian Büscher¹, Peter Lemmens¹, Chandra Shekhar², and Claudia Felser² — ¹LENA, TU-BS, Braunschweig, Germany — ²CPFS, MPI, Dresden, Germany

We use Raman spectroscopy to study phonon intensities as a function of light polarization and magnetic field. The investigated system is the chiral Weyl semimetal PdGa. PdGa has chirally ordered Pd and Ga atoms along the c-axis, forming a helix with a distinct handedness. We observed a unique phonon effect with twisted light on specific modes of PdGa depending on the direction of the magnetic field and the handedness of the incident light.

Work supported by DFG EXC-2123-390837967 Quantum-Frontiers, DFG Le967/16-1, DFG-RTG 1952/1, and the Quantum- and Nano-Metrology (QUANOMET) initiative of Lower Saxony within project NL-4.