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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2506.21479 |
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| _version_ | 1866912451855908864 |
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| author | Peng, Lei Lian, Ruixiao Chen, Hongyu Li, Ben Wu, Yu Zheng, Yuxiang Zhang, Hao |
| author_facet | Peng, Lei Lian, Ruixiao Chen, Hongyu Li, Ben Wu, Yu Zheng, Yuxiang Zhang, Hao |
| contents | Band convergence is a key strategy for enhancing thermoelectric (TE) performance. Herein, we demonstrate a promising approach to enhance band convergence through inducing Rashba splitting in topological insulators. Theoretically designed Janus $β$-Bi$_2$Se$_2$Te and $β$-Bi$_2$Te$_2$Se exhibited inherent topological band inversion and Rashba splitting due to the strong spin-orbit coupling (SOC) with broken inversion symmetry. These characteristics synergistically improve band convergence, leading to a substantially enhanced power factor. Meanwhile, the Janus structural asymmetry suppresses lattice thermal conductivity. Consequently, Janus structures achieve boosted TE performance, especially for $β$-Bi$_2$Se$_2$Te, peaking figure of merit ($zT$) of 2.82. This work establishes a new framework for designing Janus topological compounds with high TE performance by the synergistic effect of Rashba splitting and band inversion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_21479 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Synergy of Rashba and Topological Effects for High-Performance Bismuth-Based Thermoelectrics Peng, Lei Lian, Ruixiao Chen, Hongyu Li, Ben Wu, Yu Zheng, Yuxiang Zhang, Hao Materials Science Band convergence is a key strategy for enhancing thermoelectric (TE) performance. Herein, we demonstrate a promising approach to enhance band convergence through inducing Rashba splitting in topological insulators. Theoretically designed Janus $β$-Bi$_2$Se$_2$Te and $β$-Bi$_2$Te$_2$Se exhibited inherent topological band inversion and Rashba splitting due to the strong spin-orbit coupling (SOC) with broken inversion symmetry. These characteristics synergistically improve band convergence, leading to a substantially enhanced power factor. Meanwhile, the Janus structural asymmetry suppresses lattice thermal conductivity. Consequently, Janus structures achieve boosted TE performance, especially for $β$-Bi$_2$Se$_2$Te, peaking figure of merit ($zT$) of 2.82. This work establishes a new framework for designing Janus topological compounds with high TE performance by the synergistic effect of Rashba splitting and band inversion. |
| title | Synergy of Rashba and Topological Effects for High-Performance Bismuth-Based Thermoelectrics |
| topic | Materials Science |
| url | https://arxiv.org/abs/2506.21479 |