Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2
Abstract Charge-carrier compensation in topological semimetals amplifies the Nernst signal and simultaneously degrades the Seebeck coefficient. In this study, we report the simultaneous achievement of both a large Nernst signal and an unsaturating magneto-Seebeck coefficient in a topological nodal-l...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-55490-6 |
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| author | Haihua Hu Xiaolong Feng Yu Pan Vicky Hasse Honghui Wang Bin He Claudia Felser |
| author_facet | Haihua Hu Xiaolong Feng Yu Pan Vicky Hasse Honghui Wang Bin He Claudia Felser |
| author_sort | Haihua Hu |
| collection | DOAJ |
| description | Abstract Charge-carrier compensation in topological semimetals amplifies the Nernst signal and simultaneously degrades the Seebeck coefficient. In this study, we report the simultaneous achievement of both a large Nernst signal and an unsaturating magneto-Seebeck coefficient in a topological nodal-line semimetal TaAs2 single crystal. The unique dual-high transverse and longitudinal thermopowers are attributed to multipocket synergy effects: the combination of a strong phonon-drag effect and the two overlapping highly dispersive conduction and valence bands with electron–hole compensation and high mobility, promising a large Nernst effect; the third Dirac band causes a large magneto-Seebeck effect. High transverse and longitudinal power factors of ~3100 and ~50 μW cm−1 K−2, respectively, are achieved, surpassing those of other topological semimetals and mainstream semiconductors. Our study presents a feasible approach for optimizing the longitudinal and transverse thermopowers in topological semimetals simultaneously and demonstrates the potential of TaAs2 for low temperature solid-state cooling. |
| format | Article |
| id | doaj-art-f1dc947e6867415fba7a188f386591d4 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-f1dc947e6867415fba7a188f386591d42025-01-05T12:39:41ZengNature PortfolioNature Communications2041-17232025-01-011611810.1038/s41467-024-55490-6Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2Haihua Hu0Xiaolong Feng1Yu Pan2Vicky Hasse3Honghui Wang4Bin He5Claudia Felser6Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40College of Materials Science and Engineering and Center of Quantum Materials & Devices, Chongqing UniversityMax Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40Abstract Charge-carrier compensation in topological semimetals amplifies the Nernst signal and simultaneously degrades the Seebeck coefficient. In this study, we report the simultaneous achievement of both a large Nernst signal and an unsaturating magneto-Seebeck coefficient in a topological nodal-line semimetal TaAs2 single crystal. The unique dual-high transverse and longitudinal thermopowers are attributed to multipocket synergy effects: the combination of a strong phonon-drag effect and the two overlapping highly dispersive conduction and valence bands with electron–hole compensation and high mobility, promising a large Nernst effect; the third Dirac band causes a large magneto-Seebeck effect. High transverse and longitudinal power factors of ~3100 and ~50 μW cm−1 K−2, respectively, are achieved, surpassing those of other topological semimetals and mainstream semiconductors. Our study presents a feasible approach for optimizing the longitudinal and transverse thermopowers in topological semimetals simultaneously and demonstrates the potential of TaAs2 for low temperature solid-state cooling.https://doi.org/10.1038/s41467-024-55490-6 |
| spellingShingle | Haihua Hu Xiaolong Feng Yu Pan Vicky Hasse Honghui Wang Bin He Claudia Felser Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2 Nature Communications |
| title | Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2 |
| title_full | Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2 |
| title_fullStr | Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2 |
| title_full_unstemmed | Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2 |
| title_short | Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2 |
| title_sort | multipocket synergy towards high thermoelectric performance in topological semimetal taas2 |
| url | https://doi.org/10.1038/s41467-024-55490-6 |
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