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Quantized Thermoelectric Hall Effect Induces Giant Power Factor in a Topological Semimetal
- Source :
- Nat Commun 11, 6167 (2020)
- Publication Year :
- 2019
-
Abstract
- 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 Sxx= 1.1x10^3 muV/K and giant power factor ~525 muW/cm/K^2 are observed at ~40K, 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.<br />Comment: 54 pages total, 5 main figures + 22 supplementary figures. To appear in Nature Communications (2020)
Details
- Database :
- arXiv
- Journal :
- Nat Commun 11, 6167 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1904.03179
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1038/s41467-020-19850-2