Delocalization of weakly interacting bosons in a 1D quasiperiodic potential

Understand

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 cou- pling as the temperature increases.
• This means that the system of bosons can undergo a transition from a fluid to insulator (glass) state under heating.