The 80th JSAP Autumn Meeting 2019

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4 JSAP-OSA Joint Symposia 2019 » 4.3 Ultrafast Optics and Laser Processing

[20p-E214-1~14] 4.3 Ultrafast Optics and Laser Processing

Fri. Sep 20, 2019 1:15 PM - 6:30 PM E214 (E214)

Takuro Ideguchi(Univ. of Tokyo), Sze Set(Univ. of Tokyo), Shinji Yamashita(Univ. of Tokyo)

6:15 PM - 6:30 PM

▲ [20p-E214-14] Dynamics of Long-lifetime Coherent Phonon in MoTe2

〇Kotaro Makino1, Yuta Saito1, Paul Fons1, Alexander V. Kolobov1,2, Keiji Ueno3, Muneaki Hase4 (1.NeRI, AIST, 2.Herzen Univ., 3.Saitama Univ., 4.Dept. of Appl. Phys., Univ. of Tsukuba)

Keywords:coherent phonon, MoTe2, electron-phonon interaction

We carried out coherent phonon spectroscopy in a bulk crystal of 2H-MoTe2 by employing optical pump-probe measure-ment. We found that the lifetime of the A1g Raman-active phonon mode is unusually long even at room temperature. We also found that the frequency of the coherent phonon varies with the pump-probe time delay and its behavior strongly depends on the pump fluence.