Correlations and Pair Formation in a Repulsively Interacting Fermi Gas
Quantum Gases
2012-06-14 v2 Atomic Physics
Abstract
A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for arbitrarily large scattering length. Over a wide range of interaction strengths a rapid decay into bound pairs is observed over times on the order of 10\hbar/E_F, preventing the study of equilibrium phases of strongly repulsive fermions. Our work suggests that a Fermi gas with strong short-range repulsive interactions does not undergo a ferromagnetic phase transition.
Cite
@article{arxiv.1108.2017,
title = {Correlations and Pair Formation in a Repulsively Interacting Fermi Gas},
author = {Christian Sanner and Edward J. Su and Wujie Huang and Aviv Keshet and Jonathon Gillen and Wolfgang Ketterle},
journal= {arXiv preprint arXiv:1108.2017},
year = {2012}
}