Phase diagram of the 2d 4He in the density-temperature plane

F. V. Kusmartsev, M. Saarela

Research output: Contribution to journalArticlepeer-review


Thin 4He fihns adsorbed to weakly attractive substrates form nearly 2D layers. We describe the vortices in 2D superfluid 4He like quasiparticles. With the aid of a variational many-body calculation we estimate their inertial mass and describe their interactions with the 4He particles and other vortices. Third sound measurements revealed anomalous behavior below the BKT-phase transition temperature. We ascribe this to the sound mode traveling in the fluid of vortex-antivortex pairs. These pairs forms a crystal (or liquid crystal) when the film thickness increases, the third sound mode splits into two separate modes as seen in experiments. Our many-body calculation predicts the critical density, at which the phase transition into the vortex-antivortex state at zero temperature occurs. We also describe the phase diagram of thin 4He films.

Original languageBritish English
Pages (from-to)455-456
Number of pages2
JournalCzechoslovak Journal of Physics
Issue numberSUPPL. 1
StatePublished - 1996


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