Macroscopic Quantum Coherence in a repulsive Bose-Einstein condensate

Details Macroscopic Quantum Coherence in a repulsive Bose-Einstein condensate Macroscopic Quantum Coherence in a repulsive Bose-Einstein condensate

2002-06-04

arxiv.org/abs/cond-mat/0206041v1

Phys. Rev. A 67, 023616 (2003)

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.67.023616

We consider a Bose-Einstein bicondensate (BEC) of $^{87}Rb$, trapped in two different internal levels, in a situation where the density undergoes a symmetry breaking in momentum space. This occurs for a suitable number of condensed atoms within a double well dispersion curve, obtained by Raman coupling two internal states with two tilted and detuned light fields. Evidence of bistability results from the Gross-Pitaevskii equation. By second quantization, we evaluate the tunneling rate between the two asymmetric states; the effects of losses on coherence are also considered.

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