$Ab\ initio$ model of optical properties of two-temperature warm dense matter
Résumé
We present a model to describe thermophysical and optical properties of two-temperature systems consisted of
heated electrons and cold ions in a solid lattice that occur during ultrafast heating experiments. Our model is based
on ab initio simulations within the framework of density functional theory. The optical properties are obtained
by evaluating the Kubo-Greenwood formula. By applying the material parameters of our ab initio model to a
two-temperature model we are able to describe the temperature relaxation process of femtosecond-laser-heated
gold and its optical properties within the same theoretical framework. Recent time-resolved measurements of
optical properties of ultrafast heated gold revealed the dynamics of the interaction between femtosecond laser
pulses and solid state matter. Different scenarios obtained from simulations of our study are compared with
experimental data [Chen, Holst, Kirkwood, Sametoglu, Reid, Tsui, Recoules, and Ng, Phys. Rev. Lett. 110,
135001 (2013)]
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