Abstract
In this chapter the fundamentals of Density Functional Theory (DFT) are introduced. After presenting the Hohenberg-Kohn theorem, the most common concepts and approximations in DFT-calculations, namely the Kohn-Sham equations and the Local Density Approximation (LDA), are summarized. They allow mapping the many-body problem on a single particle system which ultimately enables numerical calculations of the electronic ground state of a solid.
Furthermore, applications of DFT in the field of phase change materials are presented. DFT proves to be a powerful tool to reveal structural properties of the crystalline, liquid and amorphous phases as well as to explain the nature of the electronic ground state and bonding properties.
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Wełnic, W. (2009). Density Functional Theory Calculations for Phase Change Materials. In: Raoux, S., Wuttig, M. (eds) Phase Change Materials. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-84874-7_2
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DOI: https://doi.org/10.1007/978-0-387-84874-7_2
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