Influence of coherent optical phonon on ultrafast energy relaxation

Influence of coherent optical phonon on ultrafast energy relaxation
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相干光学声子对超快能量弛豫的影响

DOI:
10.1063/1.4928657
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发表时间:
2015-08
影响因子:
4
通讯作者:
Chen Y. F.
Chen Y. F.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang J. L.;Guo L.;Liu C. H.;Xu X.;Chen Y. F.

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利用共线双色泵浦-探测技术研究了Bi_2Te_3薄膜的超快能量弛豫过程。通过改变双泵浦脉冲的分离时间,可以增强和破坏相干光学声子。在第二个泵浦脉冲之后的反射率迹线的非振荡分量显示出在存在和不存在相干光学声子的情况下的明显差异,从而提供了光学声子对热载流子弛豫过程的影响的直接证据。当相干光学声子参与能量传递过程时,推导出的特征时间系统地变小。相比之下,传统的弛豫过程相对较慢,这是由非相干光学声子的屏蔽效应所解释的。这项工作表明,可以通过激发相干光学声子来操纵能量弛豫。
Ultrafast energy relaxation process in Bi2Te3 thin films is studied using a collinear two color pump-probe technique. The coherent optical phonon is enhanced and destroyed by changing the separation times of double pump pulses. The non-oscillatory component of the reflectivity trace after the second pump pulse shows a distinct difference with and without the presence of coherent optical phonons, thus providing a direct evidence of the effect of optical phonon on the hot carrier relaxation process. The deduced characteristic times are systematically smaller when coherent optical phonons are involved in the energy transfer process. Comparatively, the conventional relaxation process is relatively slow, which is explained by the screening effect of the incoherent optical phonon. This work suggests that the energy relaxation can be manipulated through the excitation of coherent optical phonons.
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