title: Delocalization of weakly interacting bosons in a 1D quasiperiodic potential.
abstract: We consider weakly interacting bosons in a 1D quasiperiodic potential (Aubry-Azbel-Harper model) in the regime where all single-particle states are localized. We show that the interparticle interaction may lead to the many-body delocalization and we obtain the finite-temperature phase diagram. Counterintuitively, in a wide range of parameters the delocalization requires stronger coupling as the temperature increases. This means that the system of bosons can undergo a transition from a fluid to insulator (glass) state under heating.
authors.affiliation: Laboratoire de Physique Théorique et Modèles Statistiques, Université Paris Sud, CNRS, 91405 Orsay, France.
authors.forename: V P
authors.initials: VP
authors.lastname: Michal
authors.affiliation: Physics Department, Columbia University, 538 West 120th Street, New York, New York 10027, USA.
authors.forename: B L
authors.initials: BL
authors.lastname: Altshuler
authors.affiliation: Laboratoire de Physique Théorique et Modèles Statistiques, Université Paris Sud, CNRS, 91405 Orsay, France and Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands and Russian Quantum Center, Novaya street 100, Skolkovo, Moscow region 143025, Russia.
authors.forename: G V
authors.initials: GV
authors.lastname: Shlyapnikov