Generation of coherent THz phonons in GeTe ferroelectrics

被引：8

作者：

Hase, M ^{[1
]}

Mizoguchi, K ^{[1
]}

Nakashima, S ^{[1
]}

机构：

[1] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan

来源：

JOURNAL OF LUMINESCENCE | 2000年 / 87-9卷

基金：

日本学术振兴会;

关键词：

femtosecond pulses; coherent phonon; GeTe; ferroelectrics;

D O I：

10.1016/S0022-2313(99)00433-0

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have examined a possibility of light-induced phase transition in GeTe ferroelectrics by using amplified femtosecond laser pulses. The frequency of the A(1g) mode corresponding to the soft mode is largely red-shifted and the amplitude of the A(1g) mode increases linearly with increasing pumping power densities, The results of double-pulse excitation experiment indicate that the red-shift of the soft mode induced by the second pulse excitation is caused by the electronic weakening of crystal bonding due to the excitation of valence electrons. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：836 / 839

页数：4

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