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arXiv 1012.0347cond-mat.quant-gasnucl-th
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有限温度下二维费米气体动能密度泛函的梯度修正

Gradient corrections to the kinetic energy density functional of a two-dimensional Fermi gas at finite temperature

Brandon P. van Zyl, K. Berkane, K Bencheikh, A. Farrell

摘要:

本文利用有限温度下的推广的T-Fermi理论,研究了二维费米气体的非相互作用动能密度泛函的首阶半经典梯度修正.我们发现一个非零的冯Weizsäcker样的梯度校正,在高温极限,去熟悉的功能形式$(\hbar^2/24m) (\nablaρ)^2/ρ$。我们的工作提供了一个理论上的理由,包括梯度修正的应用密度泛函理论的非均匀二维费米系统在任何{ \em有限}温度。

英文摘要:

We examine the leading order semiclassical gradient corrections to the non-interacting kinetic energy density functional of a two dimensional Fermi gas by applying the extended Thomas-Fermi theory at finite temperature. We find a non-zero von Weizsäcker-like gradient correction, which in the high-temperature limit, goes over to the familiar functional form $(\hbar^2/24m) (\nablaρ)^2/ρ$. Our work provides a theoretical justification for the inclusion of gradient corrections in applications of density-functional theory to inhomogeneous two-dimensional Fermi systems at any {\em finite} temperature.

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