Resumo
Abstract: We study the quantum phase transitions of a model that describes the interconversion of inter-acting bosonic atoms and molecules. Using a classical analysis, we identify a threshold coupling line
separating a molecular phase and a mixed phase. Through studies of the energy gap, von Neumann
entanglement entropy, and fidelity, we give evidence that this line is associated to a boundary line
in the ground-state phase diagram of the quantum system.