Tracking the Time Evolution of the Electron Distribution Function in Copper by Femtosecond Broadband Optical Spectroscopy.,Physical Review Letters

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Tracking the Time Evolution of the Electron Distribution Function in Copper by Femtosecond Broadband Optical Spectroscopy.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-24 , DOI: 10.1103/physrevlett.124.037401
Manuel Obergfell ₁ , Jure Demsar ₁

Affiliation

Multitemperature models are nowadays often used to quantify the ultrafast electron-phonon (boson) relaxations and coupling strengths in advanced quantum solids. To test their applicability and limitations, we perform systematic studies of carrier relaxation dynamics in copper, a prototype system for which the two-temperature model (TTM) was initially considered. Using broadband time-resolved optical spectroscopy, we study the time evolution of the electron distribution function, f(E), over a large range of excitation densities. Following intraband optical excitation, f(E) is found to be athermal over several 100 fs, with a substantial part of the absorbed energy already being transferred to the lattice. We show, however, that the electron-phonon coupling constant can still be obtained using the TTM analysis, provided that the data are analyzed over the time window where the electrons are already quasithermal, and the electronic temperature is determined experimentally.

中文翻译：

飞秒宽带光谱法跟踪铜中电子分布函数的时间演化。

如今，经常使用多温度模型来量化先进量子固体中的超快电子-声子（玻色子）弛豫和耦合强度。为了测试它们的适用性和局限性，我们对铜中的载流子弛豫动力学进行了系统研究，铜是一个最初考虑了两温模型（TTM）的原型系统。使用宽带时间分辨光谱，我们研究了在大范围的激发密度下电子分布函数f（E）的时间演化。带内光激发后，发现f（E）在几百fs的时间内是无热的，吸收的能量的大部分已经转移到晶格上。但是，我们表明，仍可以使用TTM分析获得电子-声子耦合常数，

更新日期：2020-01-22

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