Revealing the anisotropic charge-density-wave order of TiSe$_2$ through high harmonic generation
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912555733090304 |
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| author | Zhang, Lin Tyulnev, Igor Vamos, Lenard Poborska, Julita Bhattacharya, Utso Chhajlany, Ravindra W. Grass, Tobias Biegert, Jens Lewenstein, Maciej |
| author_facet | Zhang, Lin Tyulnev, Igor Vamos, Lenard Poborska, Julita Bhattacharya, Utso Chhajlany, Ravindra W. Grass, Tobias Biegert, Jens Lewenstein, Maciej |
| contents | Titanium diselenide (TiSe$_{2}$) is a transition-metal dichalcogenide material that undergoes a charge-density-wave (CDW) transition at $T_{c}\approx 200\,\mathrm{K}$. In a recent experiment [I. Tyulnev {\it et al.}, Commun. Mater. 6, 152 (2025)], the high harmonic generation (HHG) spectra of this material has been studied, which exhibits asymmetric behavior with respect to the polarization angle of the incident light and provides a new perspective to the CDW phase transition. In this work, we work out a theoretical explanation for the experimentally observed behavior of HHG spectra. We propose a simplified phenomenological mean-field model for this material, based on which the HHG spectra is calculated through the time-dependent Schr{\" o}dinger equation. This model correctly describes the measured intensity distribution of the third-, fifth-, and seventh-order harmonic generation as a function of polarization direction and reveals a strong asymmetry due to the anisotropic CDW order in the low temperature phase. Our work provides a basis for applying high harmonic spectroscopy to reveal a new perspective on the nature of CDW orders. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_13329 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Revealing the anisotropic charge-density-wave order of TiSe$_2$ through high harmonic generation Zhang, Lin Tyulnev, Igor Vamos, Lenard Poborska, Julita Bhattacharya, Utso Chhajlany, Ravindra W. Grass, Tobias Biegert, Jens Lewenstein, Maciej Strongly Correlated Electrons Titanium diselenide (TiSe$_{2}$) is a transition-metal dichalcogenide material that undergoes a charge-density-wave (CDW) transition at $T_{c}\approx 200\,\mathrm{K}$. In a recent experiment [I. Tyulnev {\it et al.}, Commun. Mater. 6, 152 (2025)], the high harmonic generation (HHG) spectra of this material has been studied, which exhibits asymmetric behavior with respect to the polarization angle of the incident light and provides a new perspective to the CDW phase transition. In this work, we work out a theoretical explanation for the experimentally observed behavior of HHG spectra. We propose a simplified phenomenological mean-field model for this material, based on which the HHG spectra is calculated through the time-dependent Schr{\" o}dinger equation. This model correctly describes the measured intensity distribution of the third-, fifth-, and seventh-order harmonic generation as a function of polarization direction and reveals a strong asymmetry due to the anisotropic CDW order in the low temperature phase. Our work provides a basis for applying high harmonic spectroscopy to reveal a new perspective on the nature of CDW orders. |
| title | Revealing the anisotropic charge-density-wave order of TiSe$_2$ through high harmonic generation |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.13329 |