Unconventional anisotropic charge dynamics in bulk $1T$-TaS$_2$ induced by interlayer dimerization
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866911381521956864 |
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| author | Tiwari, Achyut Wenzel, Maxim Roy, Renjith Mathew Prange, Christian Gompf, Bruno Dressel, Martin |
| author_facet | Tiwari, Achyut Wenzel, Maxim Roy, Renjith Mathew Prange, Christian Gompf, Bruno Dressel, Martin |
| contents | The commensurate charge-density-wave phase of the prototypical transition metal dichalcogenide $1T$-TaS$_2$ is investigated by temperature- and polarization-dependent infrared spectroscopy, revealing distinct charge dynamics parallel and perpendicular to the layers. Supported by density-functional-theory calculations, we show that the in-plane electronic structure in the low-temperature commensurate phase is reconstructed by the $\sqrt{13}\times\sqrt{13}$ distortion of the Ta layers. In contrast, the out-of-plane response is governed by a quasi-one-dimensional, Peierls-like dimerization of the two-dimensional star-of-David layers. Our results identify this dimerization as the dominant mechanism of the metal-to-insulator transition in both directions, ruling out a significant role of electronic correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_23883 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unconventional anisotropic charge dynamics in bulk $1T$-TaS$_2$ induced by interlayer dimerization Tiwari, Achyut Wenzel, Maxim Roy, Renjith Mathew Prange, Christian Gompf, Bruno Dressel, Martin Strongly Correlated Electrons The commensurate charge-density-wave phase of the prototypical transition metal dichalcogenide $1T$-TaS$_2$ is investigated by temperature- and polarization-dependent infrared spectroscopy, revealing distinct charge dynamics parallel and perpendicular to the layers. Supported by density-functional-theory calculations, we show that the in-plane electronic structure in the low-temperature commensurate phase is reconstructed by the $\sqrt{13}\times\sqrt{13}$ distortion of the Ta layers. In contrast, the out-of-plane response is governed by a quasi-one-dimensional, Peierls-like dimerization of the two-dimensional star-of-David layers. Our results identify this dimerization as the dominant mechanism of the metal-to-insulator transition in both directions, ruling out a significant role of electronic correlations. |
| title | Unconventional anisotropic charge dynamics in bulk $1T$-TaS$_2$ induced by interlayer dimerization |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.23883 |