Finite-temperature phases of trapped bosons in a two-dimensional quasiperiodic potential

We study a system of 2D trapped bosons in a quasiperiodic potential via ab initio path integral Monte Carlo simulations, focusing on its finite-temperature properties, which have not yet been explored. Alongside the superfluid, normal fluid, and insulating phases, we demonstrate the existence of a Bose glass phase, which is found to be robust to thermal fluctuations, up to about half of the critical temperature of the noninteracting system. Local quantities in the trap are characterized by employing zonal estimators, allowing us to trace a phase diagram; we do so for a set of parameters within reach of current experiments with quasi-2D optical confinement.

Automated summary

In this paper, we study the finite-temperature properties of a 2D trapped boson system in a quasiperiodic potential using ab initio path integral Monte Carlo simulations. We find the existence of a robust Bose glass phase, which is not affected by thermal fluctuations up to about half of the critical temperature of the noninteracting system. We characterize local quantities in the trap using zonal estimators and present a phase diagram for a set of parameters relevant to current experiments with quasi-2D optical confinement.