Dynamic structure factor in warm dense beryllium

被引：59

作者：

Plagemann, K-U ^{[1
]}

Sperling, P. ^{[1
]}

Thiele, R. ^{[2
]}

Desjarlais, M. P. ^{[3
]}

Fortmann, C. ^{[4
,5
]}

Doeppner, T. ^{[5
]}

Lee, H. J. ^{[6
]}

Glenzer, S. H. ^{[5
]}

Redmer, R. ^{[1
]}

机构：

[1] Univ Rostock, Inst Phys, D-18051 Rostock, Germany

[2] DESY, Ctr Free Electron Laser Sci, D-22607 Hamburg, Germany

[3] Sandia Natl Labs, Pulsed Power Sci Ctr, Albuquerque, NM 87158 USA

[4] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[5] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[6] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

NEW JOURNAL OF PHYSICS | 2012年 / 14卷

关键词：

RAY THOMSON SCATTERING; INITIO MOLECULAR-DYNAMICS; AUGMENTED-WAVE METHOD; BRILLOUIN-ZONE; LIQUID-METALS; ELECTRON-GAS; PLASMAS; MATTER; CONDUCTION; ENERGY;

D O I：

10.1088/1367-2630/14/5/055020

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the dynamic structure factor (DSF) in warm dense beryllium by means of ab initio molecular dynamics simulations. The dynamic conductivity is derived from the Kubo-Greenwood formula, and a Drude-like behaviour is observed. The corresponding dielectric function is used to determine the DSF. Since the ab initio approach is so far only applicable for wavenumbers k = 0, the k-dependence of the dielectric function is modelled via the Mermin ansatz. We present the results for the dielectric function and DSF of warm dense beryllium and compare these with perturbative treatments such as the Born-Mermin approximation. We found considerable differences between the results of these approaches; this underlines the need for a first-principles determination of the DSF of warm dense matter.

引用

页数：13

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