Berlin 2018 – wissenschaftliches Programm
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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 Büchner1,3,4, and Christian Hess1,4 — 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.