Superfluid and supersolid phases of He-4 on the second layer of graphite
PublisherAmerican Institute of Physics (AIP)
Rights accessOpen Access
We revisited the phase diagram of the second layer of 4He on top of graphite using quantum Monte Carlo methods. Our aim was to explore the existence of the novel phases suggested recently in experimental works, and determine their properties and stability limits. We found evidence of a superfluid quantum phase with hexatic correlations, induced by the corrugation of the first Helium layer, and a quasi-two-dimensional supersolid corresponding to a 7/12 registered phase. The 4/7 commensurate solid was found to be unstable, while the triangular incommensurate crystals, stable at large densities, were normal.
CitationGordillo, M.C.; Boronat, J. Superfluid and supersolid phases of He-4 on the second layer of graphite. "Physical review letters", 22 Maig 2020, vol. 124, núm. 20, p. 205301:1-205301:5.