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29 March 2024
 
  » arxiv » cond-mat/0308474

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Why only half of the fermionic atoms were converted to molecules by a Feshbach resonance?
Hui Hu ; Feng Yuan ; Shaojin Qin ;
Date 24 Aug 2003
Subject Statistical Mechanics | cond-mat.stat-mech
AbstractIn some recent experiments an ultracold gas of $^{40}$K$_2$ (or $^{6}$Li$_2$) molecules has been produced from a degenerate two-component Fermi gas of $^{40}$K (or $^{6}$Li) atoms by adiabatic passage through a Feshbach resonance. The maximum atom-molecule transfer efficiency is reported to be about 50%. We propose a simple microscopic model to characterize the ground state of the gas in the vicinity of the resonance, and show that the term describing the atom-molecule coupling is responsible for the observed efficiency 50%. Our result also suggests that the experiments have produced a molecular condensate.
Source arXiv, cond-mat/0308474
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