Journal
PHYSICAL REVIEW B
Volume 84, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.033406
Keywords
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Funding
- Junta de Andalucia group [PAI-205, FQM-5985]
- DGI (Spain) [FIS2010-18356, FIS2008-04403]
- Generalitat de Catalunya [2009SGR-1003]
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By means of diffusion Monte Carlo calculations, we obtained the complete phase diagrams of H-2 adsorbed on the outer surface of isolated armchair carbon nanotubes of radii ranging from 3.42 to 10.85 angstrom. We only considered density ranges corresponding to the filling of the first adsorption layer in these curved structures. In all cases, the zero-temperature ground state was found to be an incommensurate solid, except in the widest tube, in which the structure with lowest energy is an analogous of the root 3 x root 3 phase found in planar substrates. Those incommensurate solids result from the arrangement of the hydrogen molecules in circumferences whose plane is perpendicular to the main axis of the carbon nanotube. For each tube, there is only one of such phases stable in the density range considered, except in the case of the (5,5) and (6,6) tubes, in which two of these incommensurate solids are separated by novel first-order phase transitions.
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