Abstract

3 He atoms on a superfluid 4 He film provide a unique example of an interacting two-dimensional Fermi system. NMR and specific heat experiments on this system reveal a number of its detailed properties. For low 3 He coverages changes in the 4 He substrate coverage allow the energetics of the 3 He to be determined and a localization transition is seen as a function of the 4 He coverage. As the 3 He coverage is increased, the two-dimensional 3 He system evolves from a very dilute Fermi gas to an interacting two-dimensional Fermi liquid. A combination of NMR and specific heat measurements results in a determination of the 3 He coverage dependence of the two lowest order Landau Fermi liquid parameters, F 0 a and F 1 s . Further increases in the coverage result in a discrete step in the magnetization and the specific heat due to the occupation of a second quantum state. The subject is surveyed here very briefly.

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