H2 superglass on an amorphous carbon substrate
Abstract
The phase diagram of a para-H2 monolayer absorbed on a experimentally syntetized amorphous carbon sheet was calculated using a diffusion Monte Carlo technique. We found that the ground state of that system changed drastically from a perfectly flat substrate to a situation in which the carbon atoms were allowed a certain degree of disorder in the direction. In the first case, at zero pressure we have a glass of density 0.056 0.003 \AA in equilibrium with an incommensurate solid of 0.068 0.002 \AA. At the equilibrium density, the glass was found to have a tiny, but non-negligible superfluid faction of less than 1 \% (0.44 0.05 \%). In the -disordered substrate, we observe a significant enhancement of the superfluid fraction in the glass phase as well as a smaller but not zero value in the incommensurate crystal.
Keywords
Cite
@article{arxiv.2303.01051,
title = {H2 superglass on an amorphous carbon substrate},
author = {M. C. Gordillo and J. Boronat},
journal= {arXiv preprint arXiv:2303.01051},
year = {2023}
}