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

TL;DR

This study uses ab initio simulations to explore the finite-temperature phase diagram of 2D trapped bosons in a quasiperiodic potential, revealing a robust Bose glass phase alongside superfluid, normal fluid, and insulating phases.

Contribution

It provides the first detailed finite-temperature phase diagram for 2D trapped bosons in quasiperiodic potentials, including the identification of a stable Bose glass phase.

Findings

Bose glass phase is stable up to half the critical temperature.

Phase diagram includes superfluid, normal fluid, insulating, and Bose glass phases.

Local properties are characterized using zonal estimators.

Abstract

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 non-interacting 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.