Collective excitation frequencies and vortices of a Bose-Einstein condensed state with gravity-like interatomic attraction
| dc.creator | Ghosh, Tarun Kanti | |
| dc.date | 2001-04-19 | |
| dc.date | 2002-04-01 | |
| dc.date.accessioned | 2026-07-07T02:41:08Z | |
| dc.date.available | 2026-07-07T02:41:08Z | |
| dc.description | We study the collective excitations of a neutral atomic Bose-Einstein condensate with gravity-like $1/r $ interatomic attraction induced by electromagnetic wave. Using the time-dependent variational approach, we derive an analytical spectrum for monopole and quadrupole mode frequencies of a gravity-like self-bound Bose condensed state at zero temperature. We also analyze the excitation frequencies of the Thomas-Fermi-gravity (TF-G) and gravity (G) regimes. Our result agrees excellently with that of Giovanazzi {\em et al}. [Europhysics Letters, {\bf 56}, 1 (2001)], which is obtained within the sum-rule approach. We also consider the vortex state. We estimate the superfluid coherence length and the critical angular frequencies to create a vortex around the $ z $-axis. We find that the TF-G regime can exhibit the superfluid properties more prominently than the G-regime. We find that the monopole mode frequency of the condensate decreases due to the presence of a vortex. | |
| dc.description | 9 pages, 4 figures, version to appear in Physical Review A | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0104370 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0104370 | |
| dc.identifier | Physical Review A 65, 053616 (2002). | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/17628 | |
| dc.subject | Condensed Matter | |
| dc.title | Collective excitation frequencies and vortices of a Bose-Einstein condensed state with gravity-like interatomic attraction | |
| dc.type | text |