Multiparticle localization for disordered systems on continuous space via the fractional moment method

Abstract

We investigate the spectral and dynamical localization of a quantum system of n particles on ℝd which are subject to a random potential and interact through a pair potential which may have infinite range. We establish two conditions which ensure spectral and dynamical localization near the bottom of the spectrum of the n-particle system: (i) localization is established in the regime of weak interactions supposing one-particle localization, and (ii) localization is also established under a Lifshitz-tail type condition on the sparsity of the spectrum. In case of polynomially decaying interactions, we provide an upper bound on the number of particles up to which these conditions apply.