[19a-E205-1~12] 3.6 Ultrashort-pulse and high-intensity lasers

[19a-E205-11] Observation of coherent lattice vibrations in 1T'-MoTe₂

〇Takumi Fukuda¹, Kotaro Makino², Yuta Saito², Paul Fons¹, Alexander Kolobov^2,3, Keiji Ueno⁴, Richarj Mondal¹, Muneaki Hase¹ (1.Univ. of Tsukuba, 2.AIST, 3.Herzen Univ., 4.Saitama Univ.)

Keywords:transition metal dichalcogenides, coherent lattice vibration

We investigated coherent lattice vibrations in 1T'-MoTe₂ bulk crystal, which is a kind of TMDCs, by using time resolved optical pump-probe spectroscopy at room temperature. We observed the low frequency shear phonon mode characteristic in T_d phase, which is stable below 250K. This phonon is known as to play a role to alternate lattice symmetry. In this presentation, we argue the properties of the shear phonon mode excited with different pump powers.