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arXiv 0902.1965cond-mat.mtrl-sci
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含时密度泛函理论中的相空间探索

Phase-Space Explorations in Time-Dependent Density Functional Theory

Arun K. Rajam, Paul Hessler, Christian Gaun, Neepa T. Maitra

摘要:

我们讨论了两个问题,这是特别具有挑战性的近似随时间变化的密度泛函理论(TDDFT)捕获:电离过程中的动量分布,和内存依赖的实时动态。我们提出了一个扩展的TDDFT相空间密度,讨论了这样的“相空间密度泛函理论“的一些正式方面,并解释为什么它可以改善在这两种情况下的问题。对于每一个问题,一个两电子模型系统是精确的数值求解和分析相空间通过维格纳函数分布。

英文摘要:

We discuss two problems which are particularly challenging for approximations in time-dependent density functional theory (TDDFT) to capture: momentum-distributions in ionization processes, and memory-dependence in real-time dynamics. We propose an extension of TDDFT to phase-space densities, discuss some formal aspects of such a "phase-space density functional theory" and explain why it could ameliorate the problems in both cases. For each problem, a two-electron model system is exactly numerically solved and analysed in phase-space via the Wigner function distribution.

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