High thermoelectric power factor through topological flat bands
arxiv(2024)
Abstract
Thermoelectric (TE) materials are useful for applications such as waste heat
harvesting or efficient and targeted cooling. While various strategies towards
superior thermoelectrics through a reduction of the lattice thermal
conductivity have been developed, a path to enhance the power factor is
pressing. Here, we report large power factors up to 5 mW m^-1 K^-2 at
room temperature in the kagome metal Ni_3In_1-xSn_x. This system is
predicted to feature almost dispersionless flat bands in conjunction with
highly dispersive Dirac-like bands in its electronic structure around the Fermi
energy E_F [L. Ye et al., Nature Physics 1-5 (2024)]. Within this
study, we experimentally and theoretically showcase that tuning this flat band
precisely below E_F by chemical doping x boosts the Seebeck
coefficient and power factor, as highly mobile charge carriers scatter into the
flat-band states. Our work demonstrates the prospect of engineering extremely
flat and highly dispersive bands towards the Fermi energy in kagome metals and
introduces topological flat bands as a novel tuning knob for thermoelectrics.
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