BCS-BEC crossover in a two-dimensional Fermi gas
Quantum Gases
2015-03-17 v2
Abstract
We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T=0 using the fixed-node diffusion Monte Carlo method. We calculate the equation of state and the gap parameter as a function of the interaction strength, observing large deviations compared to mean-field predictions. In the BEC regime our results show the important role of dimer-dimer and atom-dimer interaction effects that are completely neglected in the mean-field picture. Results on Tan's contact parameter associated with short-range physics are also reported along the BCS-BEC crossover.
Cite
@article{arxiv.1011.3737,
title = {BCS-BEC crossover in a two-dimensional Fermi gas},
author = {G. Bertaina and S. Giorgini},
journal= {arXiv preprint arXiv:1011.3737},
year = {2015}
}
Comments
4 pages, 4 figures