Anomalous Transport in Type-II Weyl Semimetals

Weyl semimetals (WSM) possess monopoles of Berry curvature in momentum space. We calculate the effects of these Berry monopoles on the anomalous transport in the absence of an external magnetic field for lattice models of type-II WSM. Our calculations reveal that the anomalous transverse thermoelectric transport coefficient is enhanced with increasing nodal tilt, so long as the Fermi pockets comprising the nodes are separated. For very large tilt, the system undergoes a Lifshitz transition where the electron and hole pockets merge and the anomalous thermoelectric coefficient is suppressed. We find that the anomalous Hall coefficient is uniformly suppressed with increasing tilt. Furthermore, we find non-monotonic temperature dependence of the Hall and transverse thermoelectric transport coefficients is due to the temperature dependence of the chemical potential. Lastly, we make connections with measurable quantities and our work indicates that type-II WSM show promise for thermoelectric applications.