Bose-Einstein condensates on slightly asymmetric double-well potentials

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.063625· OSTI ID:21437947

Julia-Diaz, B; Polls, A ^[1]; Martorell, J ^[1]

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1. Departament d'Estructura i Constituents de la Materia, Universitat de Barcelona, E-08028 Barcelona (Spain)

An analytical insight into the symmetry-breaking mechanisms underlying the transition from Josephson to self-trapping regimes in Bose-Einstein condensates is presented. We obtain expressions for the ground-state properties of the system of a gas of attractive bosons modeled by a two-site Bose-Hubbard Hamiltonian with an external bias. Simple formulas are found relating the appearance of fragmentation in the condensate with the large quantum fluctuations of the population imbalance occurring in the transition from the Josephson to the self-trapped regime.

• OSTI ID: 21437947
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASYMMETRY
BOSE-EINSTEIN CONDENSATION
BOSONS
ENERGY LEVELS
FLUCTUATIONS
GROUND STATES
HAMILTONIANS
JOSEPHSON EFFECT
MATHEMATICAL OPERATORS
PHASE TRANSFORMATIONS
POTENTIALS
QUANTUM OPERATORS
SYMMETRY BREAKING
TRAPPING
VARIATIONS