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Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal.
- Author(s): Han, Fei;
- Andrejevic, Nina;
- Nguyen, Thanh;
- Kozii, Vladyslav;
- Nguyen, Quynh T;
- Hogan, Tom;
- Ding, Zhiwei;
- Pablo-Pedro, Ricardo;
- Parjan, Shreya;
- Skinner, Brian;
- Alatas, Ahmet;
- Alp, Ercan;
- Chi, Songxue;
- Fernandez-Baca, Jaime;
- Huang, Shengxi;
- Fu, Liang;
- Li, Mingda
- et al.
Published Web Location
https://doi.org/10.1038/s41467-020-19850-2Abstract
Thermoelectrics are promising by directly generating electricity from waste heat. However, (sub-)room-temperature thermoelectrics have been a long-standing challenge due to vanishing electronic entropy at low temperatures. Topological materials offer a new avenue for energy harvesting applications. Recent theories predicted that topological semimetals at the quantum limit can lead to a large, non-saturating thermopower and a quantized thermoelectric Hall conductivity approaching a universal value. Here, we experimentally demonstrate the non-saturating thermopower and quantized thermoelectric Hall effect in the topological Weyl semimetal (WSM) tantalum phosphide (TaP). An ultrahigh longitudinal thermopower [Formula: see text] and giant power factor [Formula: see text] are observed at ~40 K, which is largely attributed to the quantized thermoelectric Hall effect. Our work highlights the unique quantized thermoelectric Hall effect realized in a WSM toward low-temperature energy harvesting applications.
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