Stability Spectroscopy of Rotons in a Dipolar Bose Gas
Quantum Gases
2015-06-12 v1
Abstract
We study the stability of a quasi-one-dimensional dipolar Bose-Einstein condensate (dBEC) that is perturbed by a weak lattice potential along its axis. Our numerical simulations demonstrate that systems exhibiting a roton-maxon structure destabilize readily when the lattice wavelength equals either half the roton wavelength or a low roton subharmonic. We apply perturbation theory to the Gross-Pitaevskii and Bogoliubov de Gennes equations to illustrate the mechanisms behind the instability threshold. The features of our stability diagram may be used as a direct measurement of the roton wavelength for quasi-one-dimensional geometries.
Keywords
Cite
@article{arxiv.1301.1991,
title = {Stability Spectroscopy of Rotons in a Dipolar Bose Gas},
author = {John P. Corson and Ryan M. Wilson and John L. Bohn},
journal= {arXiv preprint arXiv:1301.1991},
year = {2015}
}
Comments
5 pages, 3 figures