Quantum Monte Carlo simulations at zero temperature of a He3 monolayer adsorbed on graphite, either clean or preplated with He4, unexpectedly point to a gas-liquid phase transition at a very low areal density of the order of 0.01Å-2. This result stems from an essentially unbiased calculation of the ground-state energy for an infinite, defect-free substrate, which interacts with He atoms via a realistic potential, whereas the interaction between two He atoms includes two- and three-body terms. The sensitivity of the gas-liquid coexistence region on the model Hamiltonian employed is discussed.
Low-density phases of He 3 monolayers adsorbed on graphite / M. Ruggeri, E. Vitali, D.E. Galli, M. Boninsegni, S. Moroni. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 93:10(2016 Mar 02), pp. 104102.1-104102.8.
Low-density phases of He 3 monolayers adsorbed on graphite
D.E. Galli;
2016
Abstract
Quantum Monte Carlo simulations at zero temperature of a He3 monolayer adsorbed on graphite, either clean or preplated with He4, unexpectedly point to a gas-liquid phase transition at a very low areal density of the order of 0.01Å-2. This result stems from an essentially unbiased calculation of the ground-state energy for an infinite, defect-free substrate, which interacts with He atoms via a realistic potential, whereas the interaction between two He atoms includes two- and three-body terms. The sensitivity of the gas-liquid coexistence region on the model Hamiltonian employed is discussed.File | Dimensione | Formato | |
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