Many-body approach to low-lying collective excitations in a BEC approaching collapse

Details Many-body approach to low-lying collective excitations in a BEC approaching collapse Many-body approach to low-lying collective excitations in a BEC approaching collapse

2008-09-22

arxiv.org/abs/0809.3680v2

J. Phys. B: At. Mol. Opt. Phys. 41, 231001 (2008)

Physics

Condensed Matter

Quantum Gases

8 pages, 2 figures

Scientific paper

10.1088/0953-4075/41/23/231001

An approximate many-body theory incorporating two-body correlations has been employed to calculate low-lying collective multipole frequencies in a Bose-Einstein condensate containing $A$ bosons, for different values of the interaction parameter $\lambda=\frac{Aa_{s}}{a_{ho}}$. Significant difference from the variational estimate of the Gross-Pitaevskii equation has been found near the collapse region. This is attributed to two-body correlations and finite range attraction of the realistic interatomic interaction. A large deviation from the hydrodynamic model is also seen for the second monopole breathing mode and the quadrupole mode for large positive $\lambda$.

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