First-principles quantum simulations of dissociation of molecular condensates: Atom correlations in momentum space
| dc.creator | Savage, C. M. | |
| dc.creator | Schwenn, P. E. | |
| dc.creator | Kheruntsyan, K. V. | |
| dc.date | 2006-06-13 | |
| dc.date | 2006-09-29 | |
| dc.date.accessioned | 2026-07-07T07:12:38Z | |
| dc.date.available | 2026-07-07T07:12:38Z | |
| dc.description | We investigate the quantum many-body dynamics of dissociation of a Bose-Einstein condensate of molecular dimers into pairs of constituent bosonic atoms and analyze the resulting atom-atom correlations. The quantum fields of both the molecules and atoms are simulated from first principles in three dimensions using the positive-P representation method. This allows us to provide an exact treatment of the molecular field depletion and s-wave scattering interactions between the particles, as well as to extend the analysis to nonuniform systems. In the simplest uniform case, we find that the major source of atom-atom decorrelation is atom-atom recombination which produces molecules outside the initially occupied condensate mode. The unwanted molecules are formed from dissociated atom pairs with non-opposite momenta. The net effect of this process -- which becomes increasingly significant for dissociation durations corresponding to more than about 40% conversion -- is to reduce the atom-atom correlations. In addition, for nonuniform systems we find that mode-mixing due to inhomogeneity can result in further degradation of the correlation signal. We characterize the correlation strength via the degree of squeezing of particle number-difference fluctuations in a certain momentum-space volume and show that the correlation strength can be increased if the signals are binned into larger counting volumes. | |
| dc.description | Final published version, with updated references and minor modifications | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0606345 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0606345 | |
| dc.identifier | Phys. Rev. A 74, 033620 (2006) | |
| dc.identifier | doi:10.1103/PhysRevA.74.033620 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/112142 | |
| dc.subject | Other Condensed Matter | |
| dc.subject | Statistical Mechanics | |
| dc.subject | Quantum Physics | |
| dc.title | First-principles quantum simulations of dissociation of molecular condensates: Atom correlations in momentum space | |
| dc.type | text |