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Warm Dense Matter Demonstrating Non-Drude Conductivity from Observations of Nonlinear Plasmon Damping.

Witte, B B L; Fletcher, L B; Galtier, E; Gamboa, E; Lee, H J; Zastrau, U; Redmer, R; Glenzer, S H; Sperling, P.
Phys Rev Lett; 118(22): 225001, 2017 Jun 02.
Artigo em Inglês | MEDLINE | ID: mdl-28621972
We present simulations using finite-temperature density-functional-theory molecular dynamics to calculate the dynamic electrical conductivity in warm dense aluminum. The comparison between exchange-correlation functionals in the Perdew-Burke-Enzerhof and Heyd-Scuseria-Enzerhof (HSE) approximation indicates evident differences in the density of states and the dc conductivity. The HSE calculations show excellent agreement with experimental Linac Coherent Light Source x-ray plasmon scattering spectra revealing plasmon damping below the widely used random phase approximation. These findings demonstrate non-Drude-like behavior of the dynamic conductivity that needs to be taken into account to determine the optical properties of warm dense matter.
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