In situ Ramsey Interferometry and Diffraction Echo with an Ultracold Fermi Gas
Other Condensed Matter
2009-11-13 v1
Abstract
We report on the first observation of Bragg scattering of an ultracold Li Fermi gas. We demonstrate a Ramsey-type matter-wave interferometer based on Bragg diffraction and find robust signatures of persistent matter wave coherences using an echo pulse sequence. Because of the Pauli principle, the diffracted fermions oscillate nearly unperturbed in the trapping potential for long times beyond 2 s. This suggests extremely long coherence times. On these timescales, only the presence of a Rb cloud seems sufficient to induce noticeable perturbations.
Keywords
Cite
@article{arxiv.0804.0532,
title = {In situ Ramsey Interferometry and Diffraction Echo with an Ultracold Fermi Gas},
author = {C. Marzok and B. Deh and S. Slama and C. Zimmermann and Ph. W. Courteille},
journal= {arXiv preprint arXiv:0804.0532},
year = {2009}
}
Comments
5 pages, 4 figures