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TT: Fachverband Tiefe Temperaturen

TT 7: Topological Semimetals I

TT 7.9: Vortrag

Montag, 12. März 2018, 11:45–12:00, A 053

Large anomalous Nernst effect driven by Berry curvature in Mn₃Ge — •Christoph Wuttke¹, Federico Caglieris¹, Kaustuv Manna², Steffen Sykora¹, Chandra Shekhar², Claudia Felser², Bernd Büchner^1,3,4, and Christian Hess^1,4 — ¹Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01069 Dresden, Germany — ²Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — ³Institut für Festkörperphysik, TU Dresden, 01069 Dresden, Germany — ⁴Center for Transport and Devices, Technische Universität Dresden, 01069 Dresden, Germany

Introducing Berry phase and curvature as properties of the electronic structure has not only started the quest for finding Weyl semimetal candidates, it was also predicted that the occurance of Weyl points in the band structure can lead to peculiar transport behaviour. We report Nernst effect measurements on the chiral antiferromagnet Mn₃Ge. A large anomalous compound dominates the magnetic field dependence of the Nernst signal and does not scale with the magnetization. Our theoretical examination shows that the anomalous behaviour is strongly influenced by the finite Berry curvature. The results show a significant sensitivity of transverse thermoelectric transport to the existence of Weyl points close to the Fermi surface.