The effect of static many-body local-field corrections to inelastic electron scattering in condensed media
The effect of static many-body local-field corrections to inelastic electron scattering in condensed media
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静态多体局域场校正对凝聚介质中非弹性电子散射的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
I. Abril
中科院分区：
文献类型：
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作者：
D. Emfietzoglou;I. Kyriakou;R. García;I. Abril
我们提出了一个可管理的方法，包括在上下文中的光学数据模型的介电响应函数，交换和相关（XC）的非弹性电子散射的影响，因此，超越了标准的随机相位近似（RPA）。多体局域场修正在其静态极限G（q），被用来纳入XC效应的所有订单在q的“屏蔽”和“散射”的水平，通过计算所谓的测试电荷测试电荷（t-t），电子测试电荷（e-t），和电子-电子（e-e）介电函数。一些最常用的解析近似G（q）的检查，从早期的Hubbard式的表达式，最近的参数化配方，满足一些已知的渐近极限。以固体（无定形）碳为例，研究了不同G（q）模型对凝聚态中中低中能电子非弹性散射的影响。结果表明，当XC校正在所有级别…
We present a manageable approach to include, within the context of optical-data models of the dielectric response function, exchange and correlation (XC) effects in inelastic electron scattering, thus, going beyond the standard random-phase approximation (RPA). The many-body local-field correction in its static limit, G(q), is employed to incorporate XC effects to all orders in q at both the level of “screening” and the level of “scattering” by computing the so-called test-charge–test-charge (t–t), electron–test-charge (e–t), and electron–electron (e–e) dielectric functions. Some of the most used analytic approximations for G(q) are examined, ranging from the early Hubbard-like expressions to more recent parameterized formulations that satisfy some of the known asymptotic limits. The effect of the different G(q) models upon the inelastic scattering of low-medium energy electrons in condensed matter is examined using solid (amorphous) carbon as an example. It is shown that when XC corrections at all levels...