Optical Excitations of Flat Bands Induced by Exciton Condensation in Ta$_2$Pd$_3$Te$_{5}$
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arXiv
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866913907127353344 |
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| author | Yi, Shaohui Liao, Zhiyu Liang, Chenhao Zhang, Sheng Deng, Xiutong Xie, Yongjie Zheng, Lincong Wang, Yujie Wu, Yubiao Wang, Zhijun Shi, Youguo Qiu, Xianggang Xu, Bing |
| author_facet | Yi, Shaohui Liao, Zhiyu Liang, Chenhao Zhang, Sheng Deng, Xiutong Xie, Yongjie Zheng, Lincong Wang, Yujie Wu, Yubiao Wang, Zhijun Shi, Youguo Qiu, Xianggang Xu, Bing |
| contents | We report on the charge dynamics of Ta$_2$Pd$_3$Te$_5$ using temperature-dependent optical spectroscopy with polarized light. We observe a metal-insulator transition characterized by the collapse of Drude response and the emergence of sharp and narrow absorption peaks at low temperatures. Unlike previous excitonic insulator candidates such as TiSe$_2$ and Ta$_2$NiSe$_5$, where the excitonic order is intertwined with charge density wave or structural instabilities, the sharp features in Ta$_2$Pd$_3$Te$_5$ point to intrinsic excitonic excitations associated with ultra-flat bands driven by many-body renormalization of the band structure via spontaneous exciton condensation. Our findings thus provide clear-cut optical evidence for exciton condensation in a bulk crystal and establish Ta$_2$Pd$_3$Te$_5$ as a promising platform for exploring correlated quantum phases and novel excitonic phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_18350 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical Excitations of Flat Bands Induced by Exciton Condensation in Ta$_2$Pd$_3$Te$_{5}$ Yi, Shaohui Liao, Zhiyu Liang, Chenhao Zhang, Sheng Deng, Xiutong Xie, Yongjie Zheng, Lincong Wang, Yujie Wu, Yubiao Wang, Zhijun Shi, Youguo Qiu, Xianggang Xu, Bing Materials Science Strongly Correlated Electrons We report on the charge dynamics of Ta$_2$Pd$_3$Te$_5$ using temperature-dependent optical spectroscopy with polarized light. We observe a metal-insulator transition characterized by the collapse of Drude response and the emergence of sharp and narrow absorption peaks at low temperatures. Unlike previous excitonic insulator candidates such as TiSe$_2$ and Ta$_2$NiSe$_5$, where the excitonic order is intertwined with charge density wave or structural instabilities, the sharp features in Ta$_2$Pd$_3$Te$_5$ point to intrinsic excitonic excitations associated with ultra-flat bands driven by many-body renormalization of the band structure via spontaneous exciton condensation. Our findings thus provide clear-cut optical evidence for exciton condensation in a bulk crystal and establish Ta$_2$Pd$_3$Te$_5$ as a promising platform for exploring correlated quantum phases and novel excitonic phenomena. |
| title | Optical Excitations of Flat Bands Induced by Exciton Condensation in Ta$_2$Pd$_3$Te$_{5}$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.18350 |