title: Anderson localization of pairs in bichromatic optical lattices.
abstract: We investigate the formation of bound states made of two interacting atoms moving in a one dimensional (1D) quasiperiodic optical lattice. We derive the quantum phase diagram for Anderson localization of both attractively and repulsively bound pairs. We calculate the pair binding energy and show analytically that its behavior as a function of the interaction strength depends crucially on the nature-extended, multifractal, localized-of the single-particle atomic states. Experimental implications of our results are discussed.
authors.affiliation: Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot-Paris 7 and CNRS, UMR 7162, 75205 Paris Cedex 13, France.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Dufour
authors.forename: Giuliano
authors.initials: G
authors.lastname: Orso