光脉冲激发下金属中的电子-电子和电子-声子弛豫
Electron-electron and electron-phonon relaxation in metals excited by optical pulse
摘要：
简要概述了用于描述由短激光脉冲激发的金属中的弛豫过程的理论模型。主要的努力是描述不同的过程发生后的激光脉冲的吸收。讨论了目前广泛使用的双温模型，并确定了该模型的适用条件。各种方法求解玻尔兹曼动力学方程进行了讨论。结果表明，在低激发限的情况下，弛豫是由光激发电子发射声子决定的。讨论了从实验中获得电子-声子耦合常数值的可能性。
英文摘要：
A short overview of theoretical models for the description of the relaxation processes in metals excited by a short laser pulse is presented. The main effort is given to description of different processes which are taking place after absorption of the laser pulse. Widely used two temperature model is discussed and the conditions of applicability of this model are identified. Various approaches for solving the Boltzmann kinetic equations are discussed. It is identified that in the case of low excitation limit the relaxation is determined by the emission of phonons by photoexcited electrons. The possibility to obtain the value of the electron phonon coupling constant from experiments is discussed.
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