Superfluidity of dense 4He in vycor.

  title={Superfluidity of dense 4He in vycor.},
  author={Saad A. Khairallah and David M. Ceperley},
  journal={Physical review letters},
  volume={95 18},
We calculate properties of a model of 4He in Vycor using the path integral Monte Carlo method. We find that 4He forms a distinct layered structure with a highly localized first layer, a disordered second layer with some atoms delocalized and able to give rise to the observed superfluid response, and higher layers of nearly perfect crystals. The addition of a single 3He atom was enough to bring down the total superfluidity by blocking the exchange in the second layer. Our results are consistent… CONTINUE READING