H2 superglass on an amorphous carbon substrate Gordillo, M. C. Boronat, J. Gas We acknowledge financial support from Ministerio de Ciencia e Innovacion MCIN/AEI/10.13039/501100011033 (Spain) under Grants No. PID2020-113565GB-C22 and No. PID2020-113565GB-C21, and from Junta de Andalucia group PAIDI-205. M.C.G. acknowledges funding from Fondo Europeo de Desarrollo Regional (FEDER) and Consejeria de Economia, Conocimiento, Empresas y Universidad de la Junta de Andalucia, en marco del programa operativo FEDER Andalucia 2014-2020, Objetivo especifico 1.2.3, "Fomento y generacion de conocimiento frontera y de conocimiento orientado a los retos de la sociedad, desarrollo de tecnologias emergentes" under Grant No. UPO-1380159, Porcentaje de cofinanciacion FEDER 80%. J.B. acknowledges financial sup-port from Secretaria d'Universitats i Recerca del Departament d'Empresa i Coneixement de la Generalitat de Catalunya, co -funded by the European Union Regional Development Fund within the ERDF Operational Program of Catalunya (project QuantumCat, Ref. No. 001-P-001644). We also acknowledge the use of the C3UPO computer facilities at the Universidad Pablo de Olavide. The phase diagram of a para-H2 monolayer absorbed on an experimentally synthesized 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 z direction. In the first case, at zero pressure we have a glass of density 0.056 +/- 0.003 angstrom-2 in equilibrium with an incommensurate solid of 0.068 +/- 0.002 angstrom-2. At the equilibrium density, the glass was found to have a tiny, but non-negligible superfluid fraction of less than 1% (0.44 +/- 0.05%). In the z-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. 2023-05-11T08:19:07Z 2023-05-11T08:19:07Z 2023-02-23 info:eu-repo/semantics/article M. C. Gordillo and J. Boronat. H2 superglass on an amorphous carbon substrate. Physical Review B 107, L060505 (2023). [DOI: 10.1103/PhysRevB.107.L060505] https://hdl.handle.net/10481/81453 10.1103/PhysRevB.107.L060505 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional American Physical Society