Anomalous Nernst and Thermal Hall Effects in Tilted Weyl Semimetals

Abstract

We study the anomalous Nernst and thermal Hall effects in a linearized low-energy model of a tilted Weyl semimetal, with two Weyl nodes separated in momentum space. For inversion symmetric tilt, we give analytic expressions in two opposite limits: for a small tilt, corresponding to a type-I Weyl semimetal, the Nernst conductivity is finite and independent of the Fermi level, while for a large tilt, corresponding to a type-II Weyl semimetal, it acquires a contribution depending logarithmically on the Fermi energy. This result is in a sharp contrast to the nontilted case, where the Nernst response is known to be zero in the linear model. The thermal Hall conductivity similarly acquires Fermi surface contributions, which add to the Fermi level independent, zero tilt result, and is suppressed as one over the tilt parameter at half filling in the Type-II phase. In the case of inversion breaking tilt, with the tilting vector of equal modulus in the two Weyl cones, all Fermi surface contributions to both anomalous responses cancel out, resulting in zero Nernst conductivity. We discuss two possible experimental setups, representing open and closed thermoelectric circuits.

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Cited by in corpus (8)

• Flat Band in Disorder Driven Non-Hermitian Weyl Semimetals
• Anomalous thermoelectric phenomena in lattice models of multi-Weyl semimetals
• Fingerprints of the conformal anomaly on the thermoelectric transport in Dirac and Weyl semimetals: Result from a Kubo formula
• Antisymmetric Seebeck effect in a tilted Weyl semimetal
• On the renormalization of Coulomb interactions in two-dimensional tilted Dirac fermions
• Effect of chiral anomaly on the circular dichroism and Hall angle in doped and tilted Weyl semimetals
• Magnetovortical and thermoelectric transport in tilted Weyl metals
• Spatial anisotropy of Kondo screening cloud in a type-II Weyl semimetal