Abstract
In this chapter we introduce the problem of interacting electronic systems, and in particular our method of choice, density-functional theory.
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Notes
- 1.
Electrons in a crystal do not behave in the same way as free electrons, therefore we treat these effects by working in terms of weakly interacting quasiparticles, rather than the strongly interacting electrons.
- 2.
We note that the translation operator is not a Hermitian operator and it does not correspond to any observables of the system.
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Ratcliff, L. (2013). Density-Functional Theory. In: Optical Absorption Spectra Calculated Using Linear-Scaling Density-Functional Theory. Springer Theses. Springer, Heidelberg. https://doi.org/10.1007/978-3-319-00339-9_2
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