Lattice Density Functional Theory (LDFT) refers to a theoretical framework that extends concepts from traditional density functional theory (DFT) to study systems where lattice structures play a significant role. DFT itself is a computational quantum mechanical method used to investigate the electronic structure of many-body systems, primarily in the context of condensed matter physics and quantum chemistry. It relies on the electron density as the central variable, rather than the many-body wave function, which simplifies the calculations significantly.

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