Spontaneous symmetry breaking and collapse in bosonic Josephson junctions
Giovanni Mazzarella, Luca Salasnich
DOI 10.1103/PhysRevA.82.033611 · Physical Review A
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Abstract
We investigate an attractive atomic Bose-Einstein condensate (BEC) trapped by a double-well potential in the axial direction and by a harmonic potential in the transverse directions. We obtain numerically a quantum phase diagram which includes all the three relevant phases of the system: Josephson, spontaneous symmetry breaking (SSB), and collapse. We consider also the coherent dynamics of the BEC and calculate the frequency of population-imbalance mode in the Josephson phase and in the SSB phase up to the collapse. We show that these phases can be observed by using ultracold vapors of Li7 atoms in a magneto-optical trap.
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