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Rotational spectra of weakly interacting Bose-Einstein condensates

Thomas Papenbrock·George F. Bertsch
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Abstract

We study the spectrum of rotating Bose-Einstein Condensates in the limit of weak repulsive interactions and present analytical and numerical results for energies and wave functions. While the low-lying states are of collective nature, the high-lying states are dominated by single-particle excitations and can accurately approximated by simple polynomial expressions. In the limit that the number of particles is large compared to the number of excited quanta, the single-particle states become excellent approximations to the eigenstates, and a rather simple ordering scheme is obtained.

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Thomas Papenbrock, George F. Bertsch. 2000-08-22. Rotational spectra of weakly interacting Bose-Einstein condensates. https://doi.org/10.1103/physreva.63.023616

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