Revealing the anisotropic charge-density-wave order of TiSe$_2$ through high harmonic generation
| Autor: | Zhang, Lin, Tyulnev, Igor, Vamos, Lenard, Poborska, Julita, Bhattacharya, Utso, Chhajlany, Ravindra W., Grass, Tobias, Biegert, Jens, Lewenstein, Maciej |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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 et al., arXiv:2409.04216], 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\"odinger 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. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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