SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Topological Semimetals
TT 6.9: Vortrag
Montag, 27. März 2023, 11:45–12:00, HSZ 304
The anomalous photo-Nernst effect in a Dirac semimetal — •Maanwinder Partap Singh1,2, Jonas Kiemle1,2, Waldemar Schmunk1,2, Alexander Holleitner1,2, and Christoph Kastl1,2 — 1Walter Schottky Institut, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany. — 2Munich Center of Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 Munich, Germany.
The 3D Dirac semimetal HfTe5 is a model system to study unconventional Hall transport phenomena, such as quasi quantized and anomalous Hall efects, in the limit of very low charge carrier densities. Here, we report on anomalous photocurrents in HfTe5, which are intimately linked to the anomalous Hall and the related Nernst conductivities. As the dominant mechanism of photocurrent generation, we establish a, hitherto hidden, anomalous photo-Nernst effect of 3D Dirac electrons. The anomalous photo-Nernst effect manifests itself as a long-range, photoresponse along the crystal edge arising from a Shockley-Ramo type response and the local symmetry breaking at the edge. The observed temperature and density dependences of the anomalous photo-Nernst currents are consistent with a dominating intrinsic Berry curvature mechanism.