Instabilities and the roton spectrum of a quasi-1D Bose-Einstein condensed gas with dipole-dipole interactions
| dc.creator | Giovanazzi, Stefano | |
| dc.creator | O'Dell, Duncan H J | |
| dc.date | 2004-11-26 | |
| dc.date.accessioned | 2026-07-07T03:02:21Z | |
| dc.date.available | 2026-07-07T03:02:21Z | |
| dc.description | We point out the possibility of having a roton-type excitation spectrum in a quasi-1D Bose-Einstein condensate with dipole-dipole interactions. Normally such a system is quite unstable due to the attractive portion of the dipolar interaction. However, by reversing the sign of the dipolar interaction using either a rotating magnetic field or a laser with circular polarization, a stable cigar-shaped configuration can be achieved whose spectrum contains a `roton' minimum analogous to that found in helium II. Dipolar gases also offer the exciting prospect to tune the depth of this `roton' minimum by directly controlling the interparticle interaction strength. When the minimum touches the zero-energy axis the system is once again unstable, possibly to the formation of a density wave. | |
| dc.description | 7 pages, 6 figures. Special Issue: "Ultracold Polar Molecules: Formation and Collisions" | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0411678 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0411678 | |
| dc.identifier | The European Physical Journal D 31, 439 (2004) | |
| dc.identifier | doi:10.1140/epjd/e2004-00146-7 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/25369 | |
| dc.subject | Other Condensed Matter | |
| dc.title | Instabilities and the roton spectrum of a quasi-1D Bose-Einstein condensed gas with dipole-dipole interactions | |
| dc.type | text |