Coherent phonons and their properties
Coherent phonons and their properties
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相干声子及其性质
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
O. Misochko
中科院分区：
文献类型：
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作者：
O. Misochko
通过飞秒时间分辨率的光反射技术和自发拉曼散射的方法研究了半金属、半导体和超导体中的光学声子。在时域测量期间，声子系统通过第一个超短激光脉冲转换为相干态，然后通过第二个脉冲以可变延迟进行探测。在这种情况下，声子显示为以非经典状态出现，其中它们的涨落特性（在不同的正交中不同）由时间的周期函数描述。在时域和频域中获得的结果的比较表明，热声子和相干声子的能量是一致的，而它们的移相和能量弛豫时间是不同的。
The optical phonons in semimetals, semiconductors, and superconductors were studied by the light reflection techniques with femtosecond time resolution and by the method of spontaneous Raman scattering. During measurements in the time domain, the phonon system is converted into a coherent state by the first ultrashort laser pulse and then probed at a variable delay by the second pulse. In this case, the phonons are shown to occur in a nonclassical state in which their fluctuational properties, different in various quadratures, are described by periodic functions of time. A comparison of the results obtained in the time and frequency domains gives evidence that the energies of thermal and coherent phonons coincide, while their dephasing and energy relaxation times are different.