The low-temperature properties of a two-dimensional Bose fluid of charged particles interacting through a $1/r$ potential, moving in the presence of a uniform neutralizing background, is studied by Quantum Monte Carlo simulations. We make use of the Modified Periodic Coulomb potential formalism to account for the long-range character of the interaction, and explore a range of density corresponding to average interparticle separation $1\le r_s\le 80$. We report numerical results based on simulations of a system comprising up to 2304 particles. We find a superfluid ground state for $r_s$ as large as 70, i.e., significantly above the most recent numerical estimate of the Wigner crystallization threshold. Furthermore, no thermally reentrant crystalline phase or any evidence of metastable bubbles are observed near the transition, in contrast with a previous theoretical study in which quantum statistics was neglected. Altogether, the computed superfluid transition temperature depends remarkably weakly on density.

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• Bosons
• Low-dimensional models
• Superconductivity
• Superfluidity
• Quantum Monte Carlo