Anisotropic scattering of Bogoliubov excitations
| dc.creator | Gaul, Christopher | |
| dc.creator | Müller, Cord Axel | |
| dc.date | 2008-02-29 | |
| dc.date | 2008-06-18 | |
| dc.date.accessioned | 2026-07-07T09:44:56Z | |
| dc.date.available | 2026-07-07T09:44:56Z | |
| dc.description | We consider elementary excitations of an interacting Bose-Einstein condensate in the mean-field framework. As a building block for understanding the dynamics of systems comprising interaction and disorder, we study the scattering of Bogoliubov excitations by a single external impurity potential. A numerical integration of the Gross-Pitaevskii equation shows that the single-scattering amplitude has a marked angular anisotropy. By a saddle-point expansion of the hydrodynamic mean-field energy functional, we derive the relevant scattering amplitude including the crossover from sound-like to particle-like excitations. The very different scattering properties of these limiting cases are smoothly connected by an angular envelope function with a well-defined node of vanishing scattering amplitude. We find that the overall scattering is most efficient at the crossover from phonon-like to particle-like Bogoliubov excitations. | |
| dc.description | 5 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/0802.4366 | |
| dc.identifier | http://arxiv.org/abs/0802.4366 | |
| dc.identifier | Europhys. Lett. 83, 10006 (2008) | |
| dc.identifier | doi:10.1209/0295-5075/83/10006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/163049 | |
| dc.subject | Other Condensed Matter | |
| dc.title | Anisotropic scattering of Bogoliubov excitations | |
| dc.type | text |