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arXiv 0908.2732cond-mat.str-elcond-mat.mtrl-sci
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二维电子的轨道自由能泛函

Orbital-free energy functional for electrons in two dimensions

S. Pittalis, E. Rasanen

摘要:

我们推导出一个非经验的,轨道自由的密度泛函的总能量的相互作用的电子在两个维度。泛函由相互作用能的局部公式组成,其中我们遵循Parr为三维系统引入的线[R. G. Parr,J.Phys.Chem.92,3060(1988)],以及用于动能的M-F近似。从轨道和Hartree积分的自由,使建议的近似数值高效。得到的受限二维系统的总能量与密度泛函理论中的标准局域密度近似符合得很好,并且比Alas-Fermi近似精确得多。

英文摘要:

We derive a non-empirical, orbital-free density functional for the total energy of interacting electrons in two dimensions. The functional consists of a local formula for the interaction energy, where we follow the lines introduced by Parr for three-dimensional systems [R. G. Parr, J. Phys. Chem. 92, 3060 (1988)], and the Thomas-Fermi approximation for the kinetic energy. The freedom from orbitals and from the Hartree integral makes the proposed approximation numerically highly efficient. The total energies obtained for confined two-dimensional systems are in a good agreement with the standard local-density approximation within density-functional theory, and considerably more accurate than the Thomas-Fermi approximation.

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