电子气中正电子的第一性原理研究
First-Principles Study of a Positron Immersed in an Electron Gas
摘要：
本文计算了均匀电子气中单个正电子的弛豫能、接触对关联函数和湮灭对动量密度。我们实现了一个准确的描述的电子-正电子关联效应的工作中的参考系中的正电子是固定的，并使用基于单组分密度泛函理论的平均场方法。我们的正电子弛豫能和湮没率与现有最好的多体计算结果相似。我们的湮灭对动量密度显着不同，从以前的数据，包括一个“尾巴”以外的费米边缘。
英文摘要：
Calculations of the relaxation energy, contact pair-correlation function, and annihilating-pair momentum density for a single positron immersed in a homogeneous electron gas are presented. We achieve an accurate description of the electron-positron correlation effects by working in the reference frame in which the positron is stationary and using a mean-field approach based on single-component density functional theory. Our positron relaxation energies and annihilation rates are similar to those from the best existing many-body calculations. Our annihilating-pair momentum densities are significantly different from previous data, and include a "tail" beyond the Fermi edge.
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