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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Theory of out-of-equilibrium electron and phonon dynamics in metals after femtosecond laser excitation
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Theory of out-of-equilibrium electron and phonon dynamics in metals after femtosecond laser excitation

机译：在飞秒激光励磁后金属外均衡电子和声子动力学理论

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摘要

The dynamics of electrons and phonons in metals upon laser excitation are often described by the two-temperature model, which assumes that both subsystems are individually in thermal equilibrium. However, recent experiments show that this description is not sufficient to describe the out-of-equilibrium dynamics on ultrashort timescales. Here, assuming a thermalized electronic system, we extend and apply a parameter-free microscopic out-of-equilibrium model to describe the ultrafast laser-induced phonon and electron temperature dynamics of various metallic systems such as gold, aluminum, iron, nickel, and cobalt. We report strong deviations from the two-temperature model on the picosecond timescale for all the materials studied, even for those where the assumption of separate thermal equilibrium seemed less restrictive, like in gold. Furthermore, we demonstrate the importance of the mode dependence of the electron-phonon coupling for the relaxation process and reveal the significance of this channel in the lattice equilibration.
机译：在激光激发时，金属中的电子和声子的动态通常由两个温度模型描述，这假设两个子系统都在热平衡中单独进行。然而，最近的实验表明，这种描述不足以描述超短时间尺度上的平衡动力学。在这里，假设热化电子系统，我们延伸并应用无参数微观的平衡模型，以描述诸如金，铝，铁，镍等各种金属系统的超快激光诱导的声音和电子温度动力学，以及钴。我们报告了对研究的所有材料上的两温度模型的强烈偏差，即使对于那些对单独的热平衡的假设似乎较少的限制性而言，即使是金色的那些。此外，我们证明了电子 - 声子耦合对弛豫过程的模式依赖性的重要性，并揭示了晶格平衡中该通道的意义。

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    《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214305.1-214305.14|共14页
  • 作者

    Ulrike Ritzmann; Peter M. Oppeneer; Pablo Maldonado;

  • 作者单位

    Department of Physics and Astronomy Uppsala University Box 516 S-75I20 Uppsala Sweden Department of Physics Freie Universitaet Berlin Arnimallee 14 D-14195 Berlin Germany Dahlem Center of Complex Quantum Systems Freie Universitaet Berlin Arnimallee 14 D-14195 Berlin Germany;

    Department of Physics and Astronomy Uppsala University Box 516 S-75I20 Uppsala Sweden Department of Physics Freie Universitaet Berlin Arnimallee 14 D-14195 Berlin Germany;

    Department of Physics and Astronomy Uppsala University Box 516 S-75I20 Uppsala Sweden;

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