Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal

Fei Han (), Nina Andrejevic, Thanh Nguyen, Vladyslav Kozii, Quynh T. Nguyen, Tom Hogan, Zhiwei Ding, Ricardo Pablo-Pedro, Shreya Parjan, Brian Skinner, Ahmet Alatas, Ercan Alp, Songxue Chi, Jaime Fernandez-Baca, Shengxi Huang, Liang Fu () and Mingda Li ()
Additional contact information
Fei Han: Massachusetts Institute of Technology
Nina Andrejevic: Massachusetts Institute of Technology
Vladyslav Kozii: Massachusetts Institute of Technology
Quynh T. Nguyen: Massachusetts Institute of Technology
Tom Hogan: Quantum Design, Inc.
Zhiwei Ding: Massachusetts Institute of Technology
Ricardo Pablo-Pedro: Massachusetts Institute of Technology
Shreya Parjan: Wellesley College
Brian Skinner: Massachusetts Institute of Technology
Ahmet Alatas: Argonne National Laboratory
Ercan Alp: Argonne National Laboratory
Songxue Chi: Oak Ridge National Laboratory
Jaime Fernandez-Baca: Oak Ridge National Laboratory
Shengxi Huang: The Pennsylvania State University
Liang Fu: Massachusetts Institute of Technology
Mingda Li: Massachusetts Institute of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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 $$S_{xx} \sim 1.1 \times 10^3 \, \mu \, {\mathrm{V}} \, {\mathrm{K}}^{ - 1}$$ S x x ~ 1.1 × 1 0 3 μ V K − 1 and giant power factor $$\sim 525 \, \mu \, {\mathrm{W}} \, {\mathrm{cm}}^{ - 1} \, {\mathrm{K}}^{ - 2}$$ ~ 525 μ W cm − 1 K − 2 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.

Date: 2020
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DOI: 10.1038/s41467-020-19850-2

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