3He on preplated graphite

Abstract

By using the diffusion Monte Carlo method, we obtained the full phase diagram of ${}^3$He on top of graphite preplated with a solid layer of ${}^4$He. All the ${}^4$He 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 $\pm$ 0.001 Å${}^{-2}$, in good agreement with available experimental data. This is significantly different from the case of ${}^3$He 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 ${}^3$He 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.

References in corpus (12)

• Progress in Monte Carlo calculations of Fermi systems: normal liquid 3He
• Phase diagram of 4He adsorbed on graphite
• 4He on a single graphene sheet
• Path integral Monte Carlo simulation of the second layer of helium-4 adsorbed on graphite
• Phase diagram of second layer of helium adsorbed on graphite
• Supersolidity in quantum films adsorbed on graphene and graphite
• Observation of Self-binding in Monolayer ${}^3$He
• Zero-temperature equation of state of two-dimensional 3He
• Quasi-2D Liquid He-3
• Liquid and solid phases of 3He on graphite
• Evidence for a Self-Bound Liquid State and the Commensurate-Incommensurate Coexistence in 2D ${}^3$He on Graphite
• Low-density phases of ${}^3$He monolayers adsorbed on graphite

Cited by in corpus (2)

• Fluid and registered phases in the second layer of 3He on graphite
• Superconducting Niobium Calorimeter for Studies of Adsorbed Helium Monolayers