Collapse and revival of excitations in Bose-Einstein condensates
Statistical Mechanics
2009-11-11 v1
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0502441,
title = {Collapse and revival of excitations in Bose-Einstein condensates},
author = {M. Mottonen and S. M. M. Virtanen and M. M. Salomaa},
journal= {arXiv preprint arXiv:cond-mat/0502441},
year = {2009}
}
Comments
9 pages, 5 figures