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cond-mat.mtrl-sci2001
Diagrammatic self-energy approximations and the total particle number
Arno Schindlmayr, P. Garcia-Gonzalez, R. W. Godby
There is increasing interest in many-body perturbation theory as a practical tool for the calculation of ground-state properties. As a consequence, unambiguous sum rules such as th…
cond-mat.mtrl-sci2001
Exchange-correlation kernels for excited states in solids
Krzysztof Tatarczyk, Arno Schindlmayr, Matthias Scheffler
The performance of several common approximations for the exchange-correlation kernel within time-dependent density-functional theory is tested for elementary excitations in the hom…