  Kagome metal TbMn6Sn6 was recently discovered to be a ferrimagnetic
topological Dirac material by scanning tunneling microscopy/spectroscopy
measurements. Here, we report the observation of large anomalous Nernst effect
and anomalous thermal Hall effect in this compound. The anomalous transverse
transport is consistent with the Berry curvature contribution from the massive
Dirac gaps in the 3D momentum space as demonstrated by our first-principles
calculations. Furthermore, the transverse thermoelectric transport exhibits
asymmetry with respect to the applied magnetic field, i.e., an exchange-bias
behavior. Together, these features place TbMn6Sn6 as a promising system for the
outstanding thermoelectric performance based on anomalous Nernst effect.
