Abstract
For thin films of 4 He at low temperatures the addition of sub-monolayer numbers of 3 He atoms results in the 3 He residing in a ground state at the free surface of the 4 He film. For low 3 He coverage the 3 He are a nearly ideal two-dimensional Fermi system. With increasing numbers of 3 He atoms the interactions among the 3 He increase. The results from a number of experiments that reveal the remarkable properties of this rich, interacting, two-dimensional 3 He system are described. These results include the magnetization, the energetics of the 3 He atoms in quantum states, the diffusion of the 3 He along the 4 He film, and the 3 He effective mass. The techniques employed include NMR, specific heat, quartz crystal microbalance and third sound. A clearer picture of the properties of the 3 He is now emerging, and preliminary numbers for the 3 He coverage dependence of the Fermi Liquid parameters are presented. Prospects for the observation of superfluidity of the 3 He in this system are discussed.
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