Spontaneous symmetry breaking and collapse in bosonic Josephson junctions

Details Spontaneous symmetry breaking and collapse in bosonic Josephson junctions Spontaneous symmetry breaking and collapse in bosonic Josephson junctions

2010-08-28

arxiv.org/abs/1008.4876v1

Phys. Rev. A 82, 033611 (2010)

Physics

Condensed Matter

Quantum Gases

5 pages, 4 figures, to be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.82.033611

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, for the first time, 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 7Li atoms in a magneto-optical trap.

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