Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Topological Semimetals I
TT 7.5: Vortrag
Montag, 12. März 2018, 10:30–10:45, A 053
Giant anomalous Nernst effect in Weyl semimetals TaP and TaAs — •Federico Caglieris1, Christoph Wuttke1, Steffen Sykora1, Vicky Süss2, Shekhar Chandra2, Claudia Felser2, Bernd Büchner1,3,4, and Christian Heß1,4 — 1Leibniz-Institute for Solid State and Materials Research, 01069 Dresden, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01069 Dresden, Germany — 3Institut für Festkörperphysik, TU Dresden, 01069 Dresden, Germany — 4Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany
The discovery of Weyl fermions in transition metal monoarsenides/phosphides without inversion symmetry represents an exceptional breakthrough in modern condensed matter physics. However, exploring the inherent nature of these quasiparticles is experimentally challenging because most of the experimental probes rely on analyzing the Fermi arc topology or investigating the elusive chiral anomaly.
In this work we experimentally investigate the thermoelectric transport of the prototypical type-I Weyl semimetals TaP and TaAs. In particular we show that both the compounds possess a giant Nernst coefficient, which tends to saturate with increasing the magnetic field. This behavior resembles what is typically addressed as anomalous Nernst effect and it has recently been interpreted as a direct consequence of the finite Berry curvature originated from the Weyl points. Our results thus promote the Nernst coefficient as an ideal bulk probe for detecting and exploring the fingerprints of emergent Weyl physics.