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cond-mat2003
Layer- and bulk roton excitations of 4He in porous media
V. Apaja, E. Krotscheck
We examine the energetics of bulk and layer-roton excitations of 4He in various porous medial such as aerogel, Geltech, or Vycor, in order to find out what conclusions can be drawn…
cond-mat2003
Excitations in confined helium
V. Apaja, E. Krotscheck
We design models for helium in matrices like aerogel, Vycor or Geltech from a manifestly microscopic point of view. For that purpose, we calculate the dynamic structure function of…