BEC-BCS crossover and universal relations in unitary Fermi gases
Abstract
The contact parameter in unitary Fermi Gases governs the short-distance, high-momentum, and high-energy properties of the system. We perform accurate quantum Monte Carlo calculations with highly optimized trial functions to precisely determine this parameter at T=0, demonstrate its universal application to a variety of observables, and determine the regions of momentum and energy over which the leading short-range behavior is dominant. We derive Tan's expressions for the contact parameter using just the short-range behavior of the ground-state many-body wave function, and use this behavior to calculate the two-body distribution function, one-body density matrix, and the momentum distribution of unitary Fermi gases; providing a precise value of the contact parameter that can be compared to experiments.
Keywords
Cite
@article{arxiv.1012.4417,
title = {BEC-BCS crossover and universal relations in unitary Fermi gases},
author = {S. Gandolfi and K. E. Schmidt and J. Carlson},
journal= {arXiv preprint arXiv:1012.4417},
year = {2011}
}
Comments
5 pages, 4 figures, minor changes, published version