Abstract
A recent experimental paper by Du et al. [Phys. Rev. Lett. 123, 076602 (2019)] had shown colossal values of thermopower at 40 K. The Seebeck coefficient values decrease with the application of magnetic field. We found that the colossal Seebeck coefficient is due to carrier correlation and large increase in effective mass. The reduction of thermopower with magnetic field is explained by including spin-orbit interaction terms in our calculations. By tuning atomistic magnetic moment, the power factor of thermoelectric materials can be further optimized. We have shown that a ${10}^{7}$ times increase in power factor is possible by increasing magnetic field.
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