Superfluid transition of the second layer of He-4 on graphite: does substrate corrugation matter?
arXiv:2211.12554 · doi:10.1016/j.rinp.2022.106186
Abstract
The second layer of He-4 adsorbed on a graphite substrate is studied by Quantum Monte Carlo simulations. We make use of a microscopic model of the substrate fully accounting for its corrugation, and compare the results to those obtained with a smooth substrate. The only effect of corrugation is a ~20% reduction of the value of the superfluid fraction of the top layer, in the limit of zero temperature. No evidence of any commensurate (7/12) crystalline and/or "supersolid" phase is found; the superfluid transition temperature is estimated to be ~ 0.75 K. We discuss the implication of these findings on the interpretation of recent experiments.
Six pages, three figures
References in corpus (10)
- Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
- Superfluidity and Quantum Melting of para-Hydrogen clusters
- Structure, superfluidity, and quantum melting of hydrogen clusters
- Phase diagram of 4He adsorbed on graphite
- Supersolid phases of cold atom assemblies
- Spatially Modulated Superfluid State in Two-Dimensional He Films
- Superfluid transition and specific heat of the 2D x-y model: Monte Carlo simulation
- Second layer crystalline phase of helium films on graphite
- Specific heat of thin He films on graphite
- Phases of lattice hard core bosons in a periodic superlattice