Inelastic Collisions of a Fermi Gas in the BEC-BCS Crossover
Abstract
We report the measurement of inelastic three-body and two-body collisional decay rates for a two-component Fermi gas of Li, which are highly suppressed by the Pauli exclusion principle. Our measurements are made in the BEC-BCS crossover regime, near the two-body collisional (Feshbach) resonance. At high temperature (energy) the data shows a dominant three-body decay process, which is studied as a function of bias magnetic field. At low energy, the data shows a coexistence of two-body and three-body decay processes near and below the Feshbach resonance. Below resonance, the observed two-body inelastic decay can arise from molecule-atom and molecule-molecule collisions. We suggest that at and above resonance, an effective two-body decay rate arises from collisions between atoms and correlated (Cooper) pairs that can exist at sufficiently low temperature.
Keywords
Cite
@article{arxiv.0903.1804,
title = {Inelastic Collisions of a Fermi Gas in the BEC-BCS Crossover},
author = {X. Du and Y. Zhang and J. E. Thomas},
journal= {arXiv preprint arXiv:0903.1804},
year = {2015}
}
Comments
5 pages 4 figures