Supersolidity in the second layer of $para$-H${}_2$ adsorbed on graphite

Abstract

We calculated the phase diagram of the second layer of $para$-H${}_2$ adsorbed on graphite using quantum Monte Carlo methods. The second layer shows an incommensurate triangular crystal structure. By using a symmetric wave function, that makes possible molecule exchanges, we observed that this nearly two-dimensional crystal shows a finite superfluid density around a total density of 0.1650 Å${}^{-2}$. The superfluid fraction of this supersolid phase was found to be small, 0.41$\pm$0.05 \%, but still experimentally accessible.

6 pages

References in corpus (8)

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Cited by in corpus (3)

• Phases of ${}^4$He and H${}_2$ adsorbed on a single carbon nanotube
• H2 superglass on an amorphous carbon substrate
• Quantum Monte Carlo study of thin parahydrogen films on graphite