The dynamic conductivity and the plasmon profile of Aluminum in the ultra-fast-matter regime; an analysis of recent X-ray scattering data from the LCLS

Abstract

We use an explicitly isochoric two-temperature theory where the ion temperature is not assumed to be equal to the electron temperature, to analyze recent X-ray laser scattering data for Aluminum in the ultra-fast-matter (UFM) regime up to 6 eV, obtained at the Standford Linac Coherent Light Source (LCLS). The observed surprisingly low conductivities are explained by including strong electron-ion scattering effects using the phase shifts calculated via the density-functional neutral-pseudo-atom model (NPA). The applicability of the Mermin model to UFM is questioned. The static and dynamic conductivity, complex collision frequency and the plasmon line-shape are evaluated within a Born approximation and without the use of the Mermin response. This approach, where all needed quantities are obtained from the NPA model, provides good agreement with the reported experimental results.

4 pages, 4 figures, submitted for publication

References in corpus (1)

• Two-temperature pair potentials and phonon spectra for simple metals in the warm dense matter regime

Cited by in corpus (5)

• Isochoric, isobaric and ultrafast conductivities of aluminum, lithium and carbon in the warm dense matter (WDM) regime
• Ion-ion dynamic structure factor, acoustic modes and equation of state of two-temperature warm dense aluminum
• Improving dynamic collision frequencies: impacts on dynamic structure factors and stopping powers in warm dense matter
• Pair potentials for warm dense matter and their application to x-ray Thomson scattering in aluminum and beryllium
• A critical assessment of models of pair-interactions and screening used in analyzing recent warm-dense matter (WDM) experiments