Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Topological Semimetals

TT 10.3: Talk

Monday, March 17, 2025, 15:30–15:45, H36

Anomalous Hall and Nernst effect in the Weyl semimetal Ta_1+xRu_1−xTe₄ — •Mahdi Behnami^1,2,3, Dmitri Efremov¹, Grigory Shipunov¹, Saicharan Aswartham¹, Vilmos Kocsis¹, Marina Putti^3,4, Bernd Büchner^1,2, Helena Reichlova^1,2,5, and Federico Caglieris⁴ — ¹IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — ²Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany — ³Department of Physics, University of Genoa, 16146 Genova, Italy — ⁴CNR-SPIN, 16152 Genova, Italy — ⁵Institute of Physics ASCR, v.v.i., Cukrovarnick a 10, 162 53, Praha 6, Czech Republic

The anomalous Nernst effect is a transverse thermoelectric phenomenon driven by a temperature gradient perpendicular to both the heat current and the magnetic order vector. This effect is particularly valuable for probing the topological nature of materials, as it exhibits greater sensitivity to the Berry curvature near the Fermi energy compared to the anomalous Hall effect. In this study, we report that the type-II Weyl semimetal Ta_1+xRu_1−xTe₄ exhibits both anomalous Hall and Nernst effects. These phenomena can be attributed to the finite Berry curvature generated by the Weyl points in this material.

Keywords: Anomalous Nernst effect; Anomalous Hall effect; Weyl semimetals; Berry curvature