Quasi-2D Liquid He-3

Quantum Monte Carlo simulations at zero temperature of an ensemble of He-3 atoms adsorbed on Mg and Alkali substrates yield strong evidence of a thermodynamically stable liquid He-3 monolayer on all Alkali substrates, with the possible exception of Li. The effective two-dimensional density is theta approximate to 0.02 angstrom(-2) on Na, making it the lowest density liquid in nature. Its existence is underlain by zero-point atomic motion perpendicular to the substrate, whose effect is softening the short-range repulsion of the helium interatomic potential. The monolayer films should turn superfluid at a temperature T-c similar to 1 mK. No liquid film is predicted to form on Mg, or on stronger substrates such as graphite.