[23a-C206-1~8] 3.5 Ultrashort-pulse and high-intensity lasers (formerly 3.6)

[23a-C206-4] Coherent phonon dynamics in a strongly correlated system of 1T-TiSe₂

〇(M1)Yu Mizukoshi¹, Takumi Fukuda¹, Yuta Komori¹, Ryo Ishikawa², Keiji Ueno², Muneaki Hase¹ (1.Univ. Tsukuba, 2.Saitama Univ.)

Keywords:strongly correlated system, photo-induced phase transition, charge density wave

We report on the dynamics of coherent phonons in semimetal phase 1T-TiSe₂ using a femtosecond pump-probe reflectivity technique. After photoexcitation at room temperature, a phonon mode 3.48 THz , which is characteristic in CDW phase (< 202 K), was observed. Our results suggest the photo-induced phase transition into CDW phase can be found even at room temperature.