4He adsorbed outside a single carbon nanotube


The phase diagrams of 4^4He adsorbed on the external surfaces of single armchair carbon nanotubes with radii in the range 3.42 -- 10.85 \AA \ are calculated using the diffusion Monte Carlo method. For nanotubes narrower than a (10,10) one, the ground state is an incommensurate solid similar to the one found for H2_2 on the same substrates. For wider nanotubes, the phase with the minimum energy per particle is a liquid layer. Curved 3×3\sqrt 3 \times \sqrt 3 registered solids similar to the ones found on graphene and graphite were unstable for all the tubes considered.Comment: 6 pages, accepted for publication in Phys. Rev.

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