Spectrum and Dynamics of the BCS-BEC crossover from a few-body perspective
Superconductivity
2009-11-13 v2 Nuclear Theory
Atomic Physics
Quantum Physics
Abstract
The spectrum of two spin-up and two spin-down fermions in a trap is calculated using a correlated gaussian basis throughout the range of the BCS-BEC crossover. These accurate calculations provide a few-body solution to the crossover problem. This solution is used to study the time-evolution of the system as the scattering length is changed, mimicking experiments with Fermi gases near Fano-Feshbach resonances. The structure of avoiding crossings in the spectrum allow us to understand the dynamics of the system as a sequence of Landau-Zener transitions. Finally, we propose a ramping scheme to study atom-molecule coherence.
Keywords
Cite
@article{arxiv.cond-mat/0701044,
title = {Spectrum and Dynamics of the BCS-BEC crossover from a few-body perspective},
author = {Javier von Stecher and Chris H. Greene},
journal= {arXiv preprint arXiv:cond-mat/0701044},
year = {2009}
}
Comments
4 pages, final version to appear in PRL