title: Ultracold atoms in optical lattices with random on-site interactions.
abstract: We consider the physics of lattice bosons affected by disordered on-site interparticle interactions. Characteristic qualitative changes in the zero-temperature phase diagram are observed when compared to the case of randomness in the chemical potential. The Mott-insulating regions shrink and eventually vanish for any finite disorder strength beyond a sufficiently large filling factor. Furthermore, at low values of the chemical potential both the superfluid and Mott insulator are stable towards formation of a Bose glass leading to a possibly nontrivial tricritical point. We discuss feasible experimental realizations of our scenario in the context of ultracold atoms on optical lattices.
authors.affiliation: Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57 V, D-70550 Stuttgart, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Gimperlein
authors.forename: S
authors.initials: S
authors.lastname: Wessel
authors.forename: J
authors.initials: J
authors.lastname: Schmiedmayer
authors.forename: L
authors.initials: L
authors.lastname: Santos