Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-05-23
Phys. Rev. B 76, 104524 (2007)
Physics
Condensed Matter
Statistical Mechanics
7 pages, 7 figures
Scientific paper
10.1103/PhysRevB.76.104524
Adsorption of ortho-deuterium and para-hydrogen films on a graphite substrate, pre-plated with a single atomic layer of krypton, is studied theoretically by means of quantum Monte Carlo simulations at low temperature. Our model explicitly includes substrate corrugation. Energetic and structural properties of these adsorbed films are computed for a range of hydrogen coverages. Thermodynamically stable adsorbed films are solid, with no clear evidence of any liquid-like phase. Quantum exchanges of ortho-deuterium and para-hydrogen are essentially absent in this system, down to zero temperature; consequently, this system displays no superfluidity in this limit. Our simulations provide evidence of a stable domain wall fluid at low temperature, consistently with recent experimental observations.
Boninsegni Massimo
Turnbull Joseph
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