Quantum phase transitions in an interacting atom-molecule boson model

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.063621· OSTI ID:21439522

Santos, G ^[1]; Foerster, A; Mattei, E; Dahmen, S R ^[2]; Links, J ^[3]

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1. Departamento de Fisica, Universidade Federal de Sergipe, Sao Cristovao, SE (Brazil)
2. Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS (Brazil)
3. School of Mathematics and Physics, The University of Queensland, 4072 (Australia)

We study the quantum phase transitions of a model that describes the interconversion of interacting 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 with a boundary line in the ground-state phase diagram of the quantum system.

• OSTI ID: 21439522
• Journal Information: Physical Review. A, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevA.81.063621; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
BOSONS
COUPLING
ENERGY GAP
ENTROPY
MOLECULES
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
DIAGRAMS
INFORMATION
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES