Prof. Liang Cheng Profile

Prof. Liang Cheng

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Proceedings Article | 24 June 2024 Paper

Ultrafast quasiparticle dynamics and collective excitations in CsV3Sb5

Zhengxing Wei, Liang Cheng, Jingbo Qi

Proceedings Volume 13209, 1320909 (2024) https://doi.org/10.1117/12.3025385

KEYWORDS: Terahertz radiation, Ultrafast phenomena, Picosecond phenomena, Antimony, Quasiparticles, Phonons, Metals, Ultrafast laser spectroscopy, Superconductivity, Quantum optics experiments

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CsV₃Sb₅ is a recently discovered Kagome metal that exhibits a combination of superconductivity with a critical temperature (T_C) of 2.5 K and charge density wave (CDW) order at T_CDW = 94 K. In this study, we investigate the collective excitations and quasiparticle dynamics in CsV₃Sb₅ using ultrafast optical pump-probe spectroscopy. According to our results, in addition to the CDW phase related electron and coherent phonon dynamics, we found another electronic symmetry breaking by nematic phase transition at T* ( 20 K), which can mediate the relaxation of carriers. At temperature below T*, a gap about 4 meV related to the nematic order is open, which determines the low-temperature dynamics of carriers in the rst 2 picosecond (ps). Moreover, we also observed the abrupt change of electron dynamics caused by the CDW phase transition at T_CDW. Furthermore, we identify the presence of a CDW induced mode at 1.3 THz below T_CDW, as well as two collective modes at 3.1 THz and 3.8 THz below 80 K. It is noteworthy that these two collective modes appear to be associated with the breaking of C₆ rotational symmetry. These observations suggest the rich phase order below T_CDW and emphasize the need for a deeper understanding of CDW and nematicity order in the Kagome metals.

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