dorsal/arxiv
View SchemaRole of Molecular Dissociation in Feshbach-Interacting 85Rb Condensates
| Authors | Matt Mackie, Kalle-Antti Suominen, Juha Javanainen |
|---|---|
| Categories | |
| ArXiv ID | physics/0209083 |
| URL | https://arxiv.org/abs/physics/0209083 |
| Journal | M. Weidemueller and C. Zimmermann (Eds.), Interactions in Ultracold Gases: From Atoms to Molecules (Wiley-VCH, Weinheim, 2003). |
Abstract
Recent Feshbach-resonance experiments with 85Rb Bose-Einstein condensates have led to a host of unexplained results: dramatic losses of condensate atoms for an across-resonance sweep of the magnetic field, a collapsing condensate with a burst of atoms emanating from the remnant condensate, increased losses for decreasing interaction times--until very short times are reached, and coherent oscillations between remnant and burst atoms. In particular, the amplitude of the remnant-burst oscillations, and the corresponding missing atoms, have prompted speculation as to the formation of a molecular condensate. Using a minimal mean-field model, we find that rogue dissociation, molecular dissociation to noncondensate atom pairs, is qualitatively implicated as the physical mechanism responsible for these observations, although very little molecular condensate is formed. Refining the model provides excellent quantitative agreement with the experimental remnant-burst oscillations, and the fraction of molecular condensate accounts almost entirely for the measured atom loss.
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"abstract": "Recent Feshbach-resonance experiments with 85Rb Bose-Einstein condensates\nhave led to a host of unexplained results: dramatic losses of condensate atoms\nfor an across-resonance sweep of the magnetic field, a collapsing condensate\nwith a burst of atoms emanating from the remnant condensate, increased losses\nfor decreasing interaction times--until very short times are reached, and\ncoherent oscillations between remnant and burst atoms. In particular, the\namplitude of the remnant-burst oscillations, and the corresponding missing\natoms, have prompted speculation as to the formation of a molecular condensate.\nUsing a minimal mean-field model, we find that rogue dissociation, molecular\ndissociation to noncondensate atom pairs, is qualitatively implicated as the\nphysical mechanism responsible for these observations, although very little\nmolecular condensate is formed. Refining the model provides excellent\nquantitative agreement with the experimental remnant-burst oscillations, and\nthe fraction of molecular condensate accounts almost entirely for the measured\natom loss.",
"arxiv_id": "physics/0209083",
"authors": [
"Matt Mackie",
"Kalle-Antti Suominen",
"Juha Javanainen"
],
"categories": [
"physics.atom-ph",
"cond-mat.soft",
"cond-mat.stat-mech",
"physics.chem-ph",
"quant-ph"
],
"journal_ref": "M. Weidemueller and C. Zimmermann (Eds.), Interactions in\n Ultracold Gases: From Atoms to Molecules (Wiley-VCH, Weinheim, 2003).",
"title": "Role of Molecular Dissociation in Feshbach-Interacting 85Rb Condensates",
"url": "https://arxiv.org/abs/physics/0209083"
},
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