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We have performed first-principles calculations using density functionaltheory on a kagome lattice model with a chiral spin state, as a representativeexample demonstrating significant longitudinal and transverse thermoelectricproperties. The results revealed that the saddle-point-type van Hovesingularity (VHS) enhances thermoelectric effects. The longitudinalthermoelectric conductivity $\alpha_{xx}$ was large at the chemical potentialstuned close to the band at the symmetry points, K (lower band edge), $\Gamma$(upper band edge), and M (saddle point), where the VHSs of the density ofstates (DOS) were at the corresponding band energies. The transversethermoelectric conductivity $\alpha_{xy}$ was large at the chemical potentialof saddle-point-type VHS. A large anomalous Nernst coefficient of about 10$\mu$V/K at 50 K was expected.

Thermoelectric effect in kagome lattice enhanced at van Hove singularities