title: Localization of Interacting Fermions in the Aubry-André Model.
abstract: We consider interacting electrons in a one-dimensional lattice with an incommensurate Aubry-André potential in the regime when the single-particle eigenstates are localized. We rigorously establish the persistence of ground state localization in the presence of weak many-body interaction, for almost all the chemical potentials. The proof uses a quantum many-body extension of methods adopted for the stability of tori of nearly integrable Hamiltonian systems and relies on number-theoretic properties of the potential incommensurate frequency.
authors.affiliation: Università degli Studi di Milano, Via Saldini, 50, 20133 Milano, Italy.
authors.forename: Vieri
authors.initials: V
authors.lastname: Mastropietro