期刊
PHYSICAL REVIEW LETTERS
卷 86, 期 10, 页码 2078-2081出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2078
关键词
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We formulate diagrammatic rules for many-body perturbation theory which uses Kohn-Sham Green's functions as basic propagators. The diagram technique allows one to study the properties of the dynamic nonlocal exchange-correlation (xc) kernel f(xc). We show that the spatial nonlocality of f(xc) is strongly frequency dependent. In particular, in extended systems the nonlocality range diverges at the excitation energies. This divergency is related to the discontinuity of the re potential.
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