Collapse and revival of excitations in Bose-Einstein condensates

Details Collapse and revival of excitations in Bose-Einstein condensates Collapse and revival of excitations in Bose-Einstein condensates

2005-02-18

arxiv.org/abs/cond-mat/0502441v1

Phys. Rev. A 71, 023604 (2005)

Physics

Condensed Matter

Statistical Mechanics

9 pages, 5 figures

Scientific paper

10.1103/PhysRevA.71.023604

We study the energies and decay of elementary excitations in weakly interacting Bose-Einstein condensates within a finite-temperature gapless second-order theory. The energy shifts for the high-lying collective modes turn out to be systematically negative compared with the Hartree-Fock-Bogoliubov-Popov approximation and the decay of the low-lying modes is found to exhibit collapse and revival effects. In addition, perturbation theory is used to qualitatively explain the experimentally observed Beliaev decay process of the scissors mode.

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