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3He on preplated graphite
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DOI：10.1103/PhysRevB.94.165421.png)
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摘要
En 中文
By using the diffusion Monte Carlo method, we obtained the full phase diagram of He-3 on top of graphite preplated with a solid layer of He-4. All the He-4 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 angstrom(-2), in good agreement with available experimental data. This is significantly different from the case of He-3 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 He-3 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.
Keyword:
LOW MILLIKELVIN TEMPERATURES
HEAT-CAPACITY
MONTE-CARLO
2ND LAYER
2-DIMENSIONAL HE-3
LIQUID-PHASE
HELIUM
FILMS
DIMENSIONS
SYSTEMS
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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