Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Topological Semimetals - Theory (joint session TT/MA)

TT 37.10: Vortrag

Mittwoch, 3. April 2019, 12:00–12:15, H22

Access to Weyl point properties revealed by anomalous Nernst effect — •Steffen Sykora1, Christoph Wuttke1, Federico Caglieris1, Bernd Büchner1,2,3, and Christian Hess1,31IFW Dresden, 01069 Dresden, Germany — 2Institute for Solid State Physics, TU Dresden, 01069 Dresden, Germany — 3Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany

In Weyl semimetals the Nernst coefficient is dominated by anomalous contributions to the thermal particle transport which originate from a specific property of the conduction electrons, the Berry curvature. Here we extend our recently developed theoretical approach of the anomalous Nernst effect to find explicit expressions for the temperature dependence of the thermal and electrical conductivity components. We apply these findings to fit experimental curves of recent Nernst effect measurements in a Weyl semimetal where it could be shown that signatures of Weyl physics are dominating the Nernst signal. From this analysis we determine fundamental properties of the Weyl points, such as their energy and distance in k-space.

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