Thermoelectric properties of Topological Weyl Semimetal Cu$_2$ZnGeTe$_4$
| Autor: | Sahni, Bhawna, Pathak, Riddhimoy, Sreeparvathy, P C, Saha-Dasgupta, Tanusri, Biswas, Kanishka, Alam, Aftab |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The study of topological quantum materials for enhanced thermoelectric energy conversion has received significant attention recently. Topological materials (including topological insulators and Dirac/Weyl/nodal-line semi-metals) with unique nature of band structure involving linear and regular parabolic bands near Fermi level (E$_F$) have the potential to show promising TE properties. In this article, we report the promising TE performance of a quaternary chalcogenide (Cu$_2$ZnGeTe$_4$) having non-trivial topological phase. At ambient condition, the compound is a narrow band gap (0.067 eV) semiconductor, with a TE figure of merit (ZT) 1.2. Application of 5% strain drives the system to a topologically non-trivial Weyl semi-metal with the right combination of linear and parabolic bands near E$_F$, giving rise to a reasonable ZT of 0.36. Apart from strain, alloy engineering (Sn substituted at Ge) is also shown to induce topological non-triviality. The present work demonstrates the potential of such unique semimetals for exceptional electronic transport properties and hence excellent thermoelectric performance. Comment: 8 pages, 7 figures |
| Databáze: | arXiv |
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