We have used quantum evaporation to investigate the two-dimensional fermion system that forms at the free surface of (initially isotopically pure) 4He when small quantities of 3He are added to it. By measuring the first-arrival times of the evaporated atoms, we have determined that the 3He-3He potential in this system is V_3S/k_B=(0.23+/-0.02) K nm^2 (repulsive) and estimated a value of m_3S=(1.53+/-0.02)m_3 for the zero-coverage effective mass. We have also observed the predicted second layer-state which becomes occupied once the first layer-state density exceeds about 0.6 monolayers.
@article{arxiv.cond-mat/9906284,
title = {Monolayers of 3He on the Surface of Bulk Superfluid 4He},
author = {J. P. Warren and C. D. H. Williams},
journal= {arXiv preprint arXiv:cond-mat/9906284},
year = {2009}
}
Comments
2 pages, 3 figures. Submitted to Proc. LT-22 (1999) to appear in Physica B