He-3 on preplated graphite
By using the diffusion Monte Carlo method, we obtained the full phase diagram of He3 on top of graphite preplated with a solid layer of He4. All the He4 atoms of the substrate were explicitly considered and allowed to move during the simulation. We found that the ground state is a liquid of density...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/104458 |
| Acceso en línea: | https://hdl.handle.net/2117/104458 https://dx.doi.org/10.1103/PhysRevB.94.165421 |
| Access Level: | acceso abierto |
| Palabra clave: | Monte Carlo method Graphite 3He Graphite preplated Montecarlo, Mètode de Grafit Àrees temàtiques de la UPC::Física |
| Sumario: | By using the diffusion Monte Carlo method, we obtained the full phase diagram of He3 on top of graphite preplated with a solid layer of He4. All the He4 atoms of the substrate were explicitly considered and allowed to move during the simulation. We found that the ground state is a liquid of density 0.007±0.001 Å-2, in good agreement with available experimental data. This is significantly different from the case of He3 on clean graphite, in which both theory and experiment agree on the existence of a gas-liquid transition at low densities. Upon an increase in He3 density, we predict a first-order phase transition between a dense liquid and a registered 7/12 phase, the 4/7 phase being found metastable in our calculations. At larger second-layer densities, a final transition is produced to an incommensurate triangular phase. |
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