AI Article Synopsis
- Thermoelectrics can convert waste heat into electricity, but achieving efficiency at low temperatures has been difficult due to reduced electronic behavior.
- Topological materials, especially quantum limit topological semimetals, show promise in improving thermoelectric performance by maintaining high thermopower and unique conductivity properties.
- In this study, researchers successfully demonstrated these benefits in tantalum phosphide (TaP), achieving significant thermopower and a quantized Hall effect around 40 K, indicating potential for low-temperature energy harvesting.
Article 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 [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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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7710760 | PMC |
| http://dx.doi.org/10.1038/s41467-020-19850-2 | DOI Listing |
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