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

△ [23a-C206-2] Ultrafast lattice dynamics of MoTe₂ under high-density electronic excitation

〇(D)Takumi Fukuda¹, Ryota Kaburauchi¹, Yuta Saito², Kotaro Makino², Paul Fons³, Ryo Ishikawa⁴, Keiji Ueno⁴, Yusuke Arashida¹, Shoji Yoshida¹, Masaki Hada¹, Muneaki Hase¹ (1.Univ. Tsukuba, 2.AIST, 3.Keio Univ., 4.Saitama Univ.)

Keywords:transition-metal dichalcogenide, phase-change material, light-induced structural dynamics

We investigate ultrafast lattice dynamics and the possibility of light-induced structural phase transition in MoTe₂ under high-density femtosecond pulsed laser irradiation. It is found that the possible light-induced structural phase transition between semiconducting 2H and semi-metallic 1T' phases, which is predicted by theoretical calculation, is unlikely to occur solely even by dense electronic excitation with several tens of mJ/cm². In the presentation, we will discuss and interpret the structural dynamics of MoTe₂ obtained from the coherent phonon spectroscopy and the time-resolved electron diffraction measurement.