Systematics of small parahydrogen clusters in two dimensions
arXiv:1402.6811 · doi:10.1063/1.4878376
Abstract
We studied by means of computer simulations the low temperature properties of two-dimensional parahydrogen clusters comprising between 7 and 30 molecules. Computed energetics is in quantitative agreement with that reported in the only previous study [Phys. Rev. B 65, 174527 (2002)], but a generally stronger superfluid response is obtained here for clusters with more than ten molecules. Moreover, all the clusters, including the smallest one, display a well-defined, clearly identifiable solidlike structure; with only one possible exception, those with fewer than 25 molecules are (almost) entirely superfluid at the lowest temperature considered here (i.e., 0.25 K), and can thus be regarded as nanoscale "supersolids". The implications of these results on a possible bulk two-dimensional superfluid phase of parahydrogen are discussed.
References in corpus (11)
- Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
- A superfluid-droplet crystal and a free-space supersolid in a dipole-blockaded gas
- Superfluidity and Quantum Melting of para-Hydrogen clusters
- Structure, superfluidity, and quantum melting of hydrogen clusters
- Local Superfluidity of Parahydrogen Clusters
- Population size bias in Diffusion Monte Carlo
- Supersolid phases of cold atom assemblies
- Ground State Phase Diagram of Parahydrogen in One Dimension
- Disorder and the elusive superfluid phase of para-hydrogen
- Mesoscopic dipolar quantum crystals
- Possible superfluidity of molecular hydrogen in a two-dimensional crystal phase of sodium