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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >The influence of a positron on electron-positron momentum densities in metallic materials
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The influence of a positron on electron-positron momentum densities in metallic materials

机译:正电子对金属材料中电子-正电子动量密度的影响

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General properties of the electron-positron (e-p) momentum densities were investigated in the extended momentum space (Kontrym-Sznajd et al 2012 Phys. Rev. B 85 245104). In this paper, a small selection of numerical tests of our theory is presented for the independent particle model in the simple and the transition metals. It is confirmed that the intensity of the Umklapp components of the electron densities is generally reduced by a positron. Nevertheless, some of them may be enlarged, provided the fulfilment of certain conditions which are discussed in detail. On the example of yttrium it is also demonstrated how the positron influences the electron momentum densities in the reduced zone. Our considerations are given for both the independent particle model and after including the e-p correlations within the local density approach.
机译:在扩展的动量空间中研究了电子-正电子(e-p)动量密度的一般属性(Kontrym-Sznajd et al 2012 Phys.Rev.B 85 245104)。在本文中,针对简单金属和过渡金属中的独立粒子模型,提供了一些我们理论的数值测试方法。可以确认,电子密度的Umklapp成分的强度通常被正电子降低。但是,只要满足某些条件(已详细讨论),则可以扩大其中的一些范围。在钇的例子中,还证明了正电子如何影响还原区中的电子动量密度。我们为独立粒子模型以及在局部密度方法中包括e-p相关性之后都给出了考虑。

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