High thermoelectric power factor through topological flat bands
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910407320403968 |
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| author | Garmroudi, Fabian Serhiienko, Illia Di Cataldo, Simone Parzer, Michael Riss, Alexander Grasser, Matthias Stockinger, Simon Khmelevskyi, Sergii Pryga, Kacper Wiendlocha, Bartlomiej Held, Karsten Mori, Takao Bauer, Ernst Pustogow, Andrej |
| author_facet | Garmroudi, Fabian Serhiienko, Illia Di Cataldo, Simone Parzer, Michael Riss, Alexander Grasser, Matthias Stockinger, Simon Khmelevskyi, Sergii Pryga, Kacper Wiendlocha, Bartlomiej Held, Karsten Mori, Takao Bauer, Ernst Pustogow, Andrej |
| contents | 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$_3$In$_{1-x}$Sn$_x$. 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 $E_\text{F}$ [L. Ye et al., Nature Physics 1-5 (2024)]. Within this study, we experimentally and theoretically showcase that tuning this flat band precisely below $E_\text{F}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_08067 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High thermoelectric power factor through topological flat bands Garmroudi, Fabian Serhiienko, Illia Di Cataldo, Simone Parzer, Michael Riss, Alexander Grasser, Matthias Stockinger, Simon Khmelevskyi, Sergii Pryga, Kacper Wiendlocha, Bartlomiej Held, Karsten Mori, Takao Bauer, Ernst Pustogow, Andrej Strongly Correlated Electrons 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$_3$In$_{1-x}$Sn$_x$. 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 $E_\text{F}$ [L. Ye et al., Nature Physics 1-5 (2024)]. Within this study, we experimentally and theoretically showcase that tuning this flat band precisely below $E_\text{F}$ 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. |
| title | High thermoelectric power factor through topological flat bands |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2404.08067 |