Quantum coherence of double-well BEC: a SU(2)-coherent-state path-integral approach

Details Quantum coherence of double-well BEC: a SU(2)-coherent-state path-integral approach Quantum coherence of double-well BEC: a SU(2)-coherent-state path-integral approach

2001-04-19

arxiv.org/abs/cond-mat/0104361v4

Physics

Condensed Matter

6 pages, 2 figures, final version to appear in Physcial Review A

Scientific paper

Macroscopic quantum coherence of Bose gas in a double-well potential is studied based on SU(2)-coherent-state path-integral. The ground state and fluctuations around it can be obtained by this method. In this picture, one can obtain macroscopic quantum superposition states for attractive Bose gas. The coherent gap of degenerate ground states is obtained with the instanton technique. The phenomenon of macroscopic quantum self-trapping is also discussed.

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