Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 202, Issue 1-2, Pages 1-10Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-020-02548-6
Keywords
Superfluidity; Parahydrogen; Quantum Monte Carlo
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Funding
- Natural Sciences and Engineering Research Council of Canada
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First-principle computer simulations show no evidence of a liquid top layer or proximity to a superfluid transition in a thin parahydrogen film adsorbed on a silica substrate at low temperatures, contradicting recent experimental claims. The top layer is found to be an insulating crystal without quantum-mechanical exchanges between molecules, consistent with observations on other substrates.
First principle computer simulations of a thin parahydrogen film adsorbed on a silica substrate at low temperature (below 6 K) yield no evidence that the top layer is liquid and/or in the proximity of a superfluid transition, as claimed in recent experimental work (Makiuchi et al. in Phys Rev Lett 123:245301, 2019). Computed values of first and second layer completion densities are in quantitative agreement with experiment, but as observed also on other substrates, the top layer is an insulating crystal, quantum-mechanical exchanges of molecules are non-existent, and the overall physical behavior of the system can be understood largely along classical lines.
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