Dynamical conductivity of warm dense matter from correlation functions with account for interband transitions

Within the generalized linear response theory, the dynamical conductivity of charged particle systems is obtained from equilibrium correlation functions. Using the force-force correlation function approach, interband transitions in addition to phonon interaction and umklapp processes are taken into account for warm dense matter. For solid-density aluminum and copper plasmas, the results are shown for dynamical collision frequency, dynamical conductivity, and opacity as functions of laser frequency accounting for interband absorption. Calculated opacities for aluminum plasmas are compared with results of first-principles density functional theory-molecular dynamic (DFT-MD) simulations and recent experiments. The problem of underestimating the size of opacities by theoretical models in the vicinity of the L edge is discussed.

Automated summary

In this study, the dynamical conductivity of charged particle systems is investigated within the framework of generalized linear response theory using force-force correlation functions, taking into account interband transitions, phonon interaction, and Umklapp processes for warm dense matter. The results for solid-density aluminum and copper plasmas are presented, showing dynamical collision frequency, dynamical conductivity, and opacity as functions of laser frequency with consideration of interband absorption. The study compares calculated opacities for aluminum plasmas with results from DFT-MD simulations and recent experiments, while also addressing the issue of theoretical models underestimating opacities near the L edge.