Condensation driven by a quantum phase transition

Abstract

The grand canonical thermodynamics of a bosonic system is studied in order to identify the footprint of its own high-density quantum phase transition. The phases displayed by the system at zero temperature establish recognizable patterns at finite temperature that emerged in the proximity of the boundary of the equilibrium diagram. The gapped phase underlines a state of collectivism/condensation at finite temperature in which particles coalesce into the ground state in spite of interacting attractively. The work establishes a framework that allows to study the phenomenon of condensation under the effect of attraction.