Production Efficiency of Ultracold Feshbach Molecules in Bosonic and Fermionic Systems
Abstract
We investigate the production efficiency of ultracold molecules in bosonic Rb and fermionic K when the magnetic field is swept across a Feshbach resonance. For adiabatic sweeps of the magnetic field, the conversion efficiency of each species is solely determined by the phase space density of the atomic cloud, in contrast to a number of theoretical predictions. Our novel model for the adiabatic pairing process, developed from general physical principles, accurately predicts the conversion efficiency for {\it both} ultracold gases of bosons and of fermions. In the non-adiabatic regime our measurements of the Rb molecule conversion efficiency follow a Landau Zener model, with a conversion efficiency that is characterized by the density divided by the time derivative of the magnetic field.
Cite
@article{arxiv.cond-mat/0411487,
title = {Production Efficiency of Ultracold Feshbach Molecules in Bosonic and Fermionic Systems},
author = {E. Hodby and S. T. Thompson and C. A. Regal and M. Greiner and A. C. Wilson and D. S. Jin and E. A. Cornell and C. E. Wieman},
journal= {arXiv preprint arXiv:cond-mat/0411487},
year = {2009}
}
Comments
5 pages, 3 figures