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This document discusses the variational ground state of an interacting electron system. It introduces a correlation function that measures the probability of two electrons being located a lattice vector away from each other. This correlation function results in an oscillating density-density correlation. It clarifies that the non-interacting Fermi sea ground state is uncorrelated by definition, but that does not mean all intersite correlations vanish. It presents an expansion of the trial state in an orthon

Author

Supriya

Language

EN