Extracting the condensate density from projection experiments with Fermi gases
Abstract
A debated issue in the physics of the BCS-BEC crossover with trapped Fermi atoms is to identify characteristic properties of the superfluid phase. Recently, a condensate fraction was measured on the BCS side of the crossover by sweeping the system in a fast (nonadiabatic) way from the BCS to the BEC sides, thus ``projecting'' the initial many-body state onto a molecular condensate. We analyze here the theoretical implications of these projection experiments, by identifying the appropriate quantum-mechanical operator associated with the measured quantities and relating them to the many-body correlations occurring in the BCS-BEC crossover. Calculations are presented over wide temperature and coupling ranges, by including pairing fluctuations on top of mean field.
Cite
@article{arxiv.cond-mat/0501631,
title = {Extracting the condensate density from projection experiments with Fermi gases},
author = {A. Perali and P. Pieri and G. C. Strinati},
journal= {arXiv preprint arXiv:cond-mat/0501631},
year = {2007}
}
Comments
4 pages, 4 figures