Plasmon Excitations Across the Charge-Density-Wave Transition in Single-Layer TiSe$_2$
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913358853177344 |
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| author | Torbatian, Zahra Novko, Dino |
| author_facet | Torbatian, Zahra Novko, Dino |
| contents | $1T$-TiSe$_2$ is believed to posses a soft electronic mode, i.e., plasmon or exciton, that might be responsible for the exciton condensation and charge-density-wave (CDW) transition. Here, we explore collective electronic excitations in single-layer $1T$-TiSe$_2$ by using the ab-initio electromagnetic linear response and unveil intricate scattering pathways of two-dimensional (2D) plasmon mode near the CDW phase. We found the dominant role of plasmon-phonon scattering, which in combination with the CDW gap excitations leads to the anomalous temperature dependence of the plasmon linewidth across the CDW transition. Below the transition temperature $T_{\rm CDW}$ a strong hybridization between 2D plasmon and CDW excitations is obtained. These optical features are highly tunable due to temperature-dependent CDW-related modifications of electronic structure and electron-phonon coupling and make CDW-bearing systems potentially interesting for applications in optoelectronics and low-loss plasmonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_11370 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Plasmon Excitations Across the Charge-Density-Wave Transition in Single-Layer TiSe$_2$ Torbatian, Zahra Novko, Dino Materials Science Strongly Correlated Electrons $1T$-TiSe$_2$ is believed to posses a soft electronic mode, i.e., plasmon or exciton, that might be responsible for the exciton condensation and charge-density-wave (CDW) transition. Here, we explore collective electronic excitations in single-layer $1T$-TiSe$_2$ by using the ab-initio electromagnetic linear response and unveil intricate scattering pathways of two-dimensional (2D) plasmon mode near the CDW phase. We found the dominant role of plasmon-phonon scattering, which in combination with the CDW gap excitations leads to the anomalous temperature dependence of the plasmon linewidth across the CDW transition. Below the transition temperature $T_{\rm CDW}$ a strong hybridization between 2D plasmon and CDW excitations is obtained. These optical features are highly tunable due to temperature-dependent CDW-related modifications of electronic structure and electron-phonon coupling and make CDW-bearing systems potentially interesting for applications in optoelectronics and low-loss plasmonics. |
| title | Plasmon Excitations Across the Charge-Density-Wave Transition in Single-Layer TiSe$_2$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2307.11370 |