We prove the occurrence of Anderson localisation for a system of infinitely many particles interacting with a short range potential, within the ground state Hartree–Fock approximation. We assume that the particles hop on a discrete lattice and that they are submitted to an external periodic potential which creates a gap in the non-interacting one particle Hamiltonian. We also assume that the interaction is weak enough to preserve a gap. We prove that the mean-field operator has exponentially localised eigenvectors, either on its whole spectrumor at the edges of its bands, depending on the strength of the disorder.
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Raphael Ducatez, Anderson localisation for infinitely many interacting particles in Hartree–Fock theory. J. Spectr. Theory 8 (2018), no. 3, pp. 1019–1050DOI 10.4171/JST/221