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arXiv · 1304.6342

Quasi-2D Liquid He-3

Michele Ruggeri·Saverio Moroni·Massimo Boninsegni
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Abstract

Quantum Monte Carlo simulations at zero temperature of an ensemble of He-3 atoms adsorbed on Mg and Alkali substrates yield strong evidence of a thermodynamically stable liquid He-3 monolayer on all Alkali substrates, with the possible exception of Li. The effective 2D density is close to 0.02$ inverse square Angstroms on Na, making it the lowest density liquid in Nature. Its existence is underlain by zero-point atomic motion perpendicular to the substrate, whose effect is softening the short-range repulsion of the helium interatomic potential. The monolayer films should turn superfluid at a temperature of order 1 mK. No liquid film is predicted to form on Mg, or on stronger substrates such as graphite.

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Michele Ruggeri, Saverio Moroni, Massimo Boninsegni. 2013-04-23. Quasi-2D Liquid He-3. https://doi.org/10.1103/physrevlett.111.045303

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