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; Mingda Li

doi:10.1038/s41467-020-19850-2

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, Mingda Li

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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~1.1×103μVK−1 and giant power factor ~525μWcm−1K−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.

Original language	English
Article number	6167
Journal	Nature Communications
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41467-020-19850-2
State	Published - Dec 2020

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).

Funding

We thank S.Y. Xu for the helpful discussions. F.H., N.A., T.H., and M.L. thank the support from US DOE BES Award number DE-SC0020148. N.A. acknowledges the support of the National Science Foundation Graduate Research Fellowship Program under Grant number 1122374. T.N. thanks the support from the MIT SMA-2 Fellowship Program and Sow-Hsin Chen Fellowship. V.K., B.S., and L.F. thank support from DOE Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-SC0018945. Q.T.N. thanks the support from MIT NSE UROP Program. Z.D. thanks support from DOD Defense Advanced Research Projects Agency (DARPA) Materials for Transduction (MATRIX) program under Grant HR0011-16-2-0041. R.P.-P. thanks the support from FEMSA and ITESM. B.S. is supported by the NSF STC “Center for Integrated Quantum Materials” under Cooperative Agreement number DMR-1231319. L.F. is partly supported by the David and Lucile Packard Foundation. This research on neutron scattering used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract number DE-AC02-06CH11357.

Funders	Funder number
FEMSA
MIT NSE
US DOE BES
National Science Foundation	1122374, DMR-1231319
David and Lucile Packard Foundation
U.S. Department of Energy
Defense Advanced Research Projects Agency	HR0011-16-2-0041
Office of Science
Basic Energy Sciences	DE-SC0020148
Argonne National Laboratory	DE-AC02-06CH11357
Massachusetts Institute of Technology
Division of Materials Sciences and Engineering	DE-SC0018945
Instituto Tecnológico y de Estudios Superiores de Monterrey

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Han, F., Andrejevic, N., Nguyen, T., Kozii, V., Nguyen, Q. T., Hogan, T., Ding, Z., Pablo-Pedro, R., Parjan, S., Skinner, B., Alatas, A., Alp, E., Chi, S., Fernandez-Baca, J., Huang, S., Fu, L., & Li, M. (2020). Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal. Nature Communications, 11(1), Article 6167. https://doi.org/10.1038/s41467-020-19850-2

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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~1.1×103μVK−1 and giant power factor ~525μWcm−1K−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.",

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Han, F, Andrejevic, N, Nguyen, T, Kozii, V, Nguyen, QT, Hogan, T, Ding, Z, Pablo-Pedro, R, Parjan, S, Skinner, B, Alatas, A, Alp, E, Chi, S, Fernandez-Baca, J, Huang, S, Fu, L & Li, M 2020, 'Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal', Nature Communications, vol. 11, no. 1, 6167. https://doi.org/10.1038/s41467-020-19850-2

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AU - Parjan, Shreya

AU - Skinner, Brian

AU - Alatas, Ahmet

AU - Alp, Ercan

AU - Chi, Songxue

AU - Fernandez-Baca, Jaime

AU - Huang, Shengxi

AU - Fu, Liang

AU - Li, Mingda

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

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