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Robust Analytic-Continuation Approach to Many-Body GW Calculations.
Journal of Chemical Theory and Computation ( IF 5.7 ) Pub Date : 2020-02-05 , DOI: 10.1021/acs.jctc.9b01235
Ivan Duchemin 1 , Xavier Blase 2
Affiliation  

The analytic continuation of the GW self-energy from the imaginary to the real-energy axis is a central difficulty for approaches exploiting the favorable properties of response functions at imaginary frequencies. Within a scheme merging contour-deformation and analytic-continuation techniques, we show on the basis of extensive calculations for large molecular sets that it is preferable to perform an analytic continuation of the dynamically screened-Coulomb potential W rather than the much more structured self-energy operator. The case of states lying far away from the gap, including core states, is addressed by generalizing the analytic-continuation scheme, accounting further for quasiparticle lifetimes.

中文翻译:

多体GW计算的鲁棒分析-连续方法。

GW自能从虚轴到实能轴的解析连续性是利用虚频上响应函数的有利特性的方法的主要难题。在融合轮廓变形和解析连续技术的方案中,我们在对大分子集进行大量计算的基础上表明,最好是对动态筛选的库仑势W进行解析连续,而不是结构化得多的自能源运营商。通过概括分析连续方案,进一步解决了准粒子的寿命,可以解决状态远离中心状态(包括核心状态)的情况。
更新日期:2020-02-23
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