~4He adsorbed inside (10,10) single-walled carbon nanotubes

摘要

Diffusion Monte Carlo calculations on the adsorption of ~4He in open-ended single-walled (10,10) nanotubes are presented. We have found a first order phase transition separating a low-density liquid phase in which all ~4He atoms are adsorbed close to the tube wall and a high-density arrangement characterized by two helium concentric layers. The energy correction due to the presence of neighboring tubes in a bundle has also been calculated, finding it negligible in the density range considered.