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arXiv · 1806.01530

Fluid and registered phases in the second layer of 3He on graphite

M. C. Gordillo·J. Boronat
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Abstract

A quantum Monte Carlo approach, considering all the corrugation effects, was used to calculate the complete phase diagram of the second $^3$He layer adsorbed on graphite. We found that a first-layer triangular solid was in equilibrium with a gas in the second layer. At a surface density $0.166 \pm 0.001$ Å$^{-2}$, this fluid changes into two first-layer registered phases: 4/7 and 7/12 solids. The 7/12 arrangement transforms into an incommensurate triangular structure of $ρ= 0.189 \pm 0.001$ Å$^{-2}$ upon further helium loading. A recently proposed hexatic phase was found to be unstable with respect to those commensurate solids.

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M. C. Gordillo, J. Boronat. 2018-06-05. Fluid and registered phases in the second layer of 3He on graphite. https://doi.org/10.1103/physrevb.97.201410

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