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  Large transverse thermoelectric figure of merit in a topological Dirac semimetal

Xiang, J., Hu, S., Lyu, M., Zhu, W., Ma, C. Y., Chen, Z., et al. (2020). Large transverse thermoelectric figure of merit in a topological Dirac semimetal. Science China - Physics, Mechanics & Astronomy, 63(3): 237011, pp. 1-7. doi:10.1007/s11433-019-1445-4.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-4F87-B Version Permalink: http://hdl.handle.net/21.11116/0000-0005-5148-F
Genre: Journal Article

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 Creators:
Xiang, JunSen1, Author
Hu, SiLe1, Author
Lyu, Meng1, Author
Zhu, WenLiang1, Author
Ma, Chao Yang1, Author
Chen, ZiYu1, Author
Steglich, Frank2, Author              
Chen, GenFu1, Author
Sun, PeiJie1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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Free keywords: Arsenic compounds; Cadmium compounds; Curve fitting; Thermoelectricity; Topology, Bipolar transport; Cd3As2; Charge compensation; Electrons and holes; Figure of merits; Fundamental constraints; Nernst effect; Thermoelectric figure of merit, Thermal conductivity
 Abstract: The Seebeck effect encounters a few fundamental constraints hindering its thermoelectric (TE) conversion efficiency. Most notably, there are the charge compensation of electrons and holes that diminishes this effect, and the Wiedemann-Franz (WF) law that makes independent optimization of the corresponding electrical and thermal conductivities impossible. Here, we demonstrate that in the topological Dirac semimetal Cd3As2 the Nernst effect, i.e., the transverse counterpart of the Seebeck effect, can generate a large TE figure of merit zNT. At room temperature, zNT ≈ 0.5 in a small field of 2 T and it significantly surmounts its longitudinal counterpart for any field. A large Nernst effect is genetically expected in topological semimetals, benefiting from both the bipolar transport of compensated electrons and holes and their high mobilities. In this case, heat and charge transport are orthogonal, i.e., not intertwined by the WF law anymore. More importantly, further optimization of zNT by tuning the Fermi level to the Dirac node can be anticipated due to not only the enhanced bipolar transport, but also the anomalous Nernst effect arising from a pronounced Berry curvature. A combination of the topologically trivial and nontrivial advantages promises to open a new avenue towards high-efficient transverse thermoelectricity. © 2019, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.

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Language(s): eng - English
 Dates: 2020-03-012020-03-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1007/s11433-019-1445-4
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Title: Science China - Physics, Mechanics & Astronomy
Source Genre: Journal
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Publ. Info: China : Science China Press
Pages: - Volume / Issue: 63 (3) Sequence Number: 237011 Start / End Page: 1 - 7 Identifier: ISSN: 1674-7348
CoNE: https://pure.mpg.de/cone/journals/resource/1674-7348