Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Topological Semimetals I
TT 7.6: Vortrag
Montag, 12. März 2018, 10:45–11:00, A 053
Giant anomalous Nernst effect in Weyl semimetals TaP and TaAs - Theory — •Steffen Sykora1, Federico Caglieris1, Christoph Wuttke1, Bernd Büchner1,2,3, and Christian Hess1,3 — 1IFW 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 electrical and thermal conductivity which originate from a specific property of the underlying system of conduction electrons, the Berry curvature. Motivated by recent experiments on the prototypical type-I Weyl semimetals TaP and TaAs we explain the measured anomalous field dependence of the Nernst coefficient in terms of a minimal model of the energy dispersion near two separated Dirac nodes. On the basis of this result we argue that our observed field dependence of the Nernst effect can straightforwardly be explained by a characteristic change of the chemical potential under variation of the external magnetic field which is applied to obtain the Nernst effect.