Photo‐induced Tellurium segregation in MoTe2
Photo‐induced Tellurium segregation in MoTe2
复制标题
MoTe2 中的光致碲偏析
DOI：
10.1002/pssr.202100633
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Hase Muneaki
中科院分区：
文献类型：
--
作者：
Fukuda Takumi;Kaburauchi Ryota;Saito Yuta;Makino Kotaro;Fons Paul;Ueno Keiji;Hase Muneaki
本文采用飞秒脉冲激光对多晶单晶进行相干声子谱研究，研究高密度激光激发下的结构相变与光热效应之间的关系。即使当使用飞秒脉冲激光时，其通常比连续波（CW）激光引起更少的热累积效应，随着激发密度的增加，在相干声子谱中观察到碲偏析，而没有观察到多晶型物之间的结构相变。然而，发现使用更高的光子能量激发抑制碲偏析。
Herein, coherent phonon spectroscopy of polymorphicsingle crystals using a femtosecond‐pulsed laser is used to investigate the relationship between structural phase transitions and photo‐thermal effects induced by high‐density laser excitation. Even when a femtosecond‐pulsed laser is used, which generally induces fewer heat accumulation effects than the case for a continuous‐wave (CW) laser, tellurium segregation is observed in coherent phonon spectra with increasing excitation density, while no structural phase transition among the polymorphs ofis observed. The use of higher photon‐energy excitation, however, is found to suppress tellurium segregation.