Giant anomalous Nernst effect in Weyl semimetals TaP and TaAs

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.