Abstract
We have studied the properties of quasi-two-dimensional 4He in an environment provided by the layered structure of hectorite. A phase transition occurs for areal densities between n=0.029 A−2 and n=0.032 A−2 where the structure of 4He changes abruptly from a 4-layer to a 5-layer configuration. The signatures of this phase transition are detectable in the static density–density response function and in the density–dependence of the roton minimum.
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