Superfluid and supersolid phases of 4He on the second layer of graphite

Abstract

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.

References in corpus (4)

• Phase diagram of 4He adsorbed on graphite
• 4He on a single graphene sheet
• Layering transitions in superfluid helium adsorbed on a carbon nanotube mechanical resonator
• Structure of metastable 2D liquid helium

Cited by in corpus (12)

• Spatially Modulated Superfluid State in Two-Dimensional ${}^4$He Films
• Two-Dimensional Bose-Hubbard Model for Helium on Graphene
• Structural Study of Adsorbed Helium Films: New Approach with Synchrotron Radiation X-rays
• Supersolidity in the second layer of $para$-H${}_2$ adsorbed on graphite
• Viscous Flow in a 1D Spin-Polarized Fermi Gas: the Role of Integrability on Viscosity
• Phase diagram and crystal melting of helium-4 in two dimensions
• Phases of ${}^4$He and H${}_2$ adsorbed on a single carbon nanotube
• H2 superglass on an amorphous carbon substrate
• Efficient simulations of Hartree--Fock equations by an accelerated gradient descent method
• Accurate Helium-Benzene Potential: from CCSD(T) to Gaussian Process Regression
• On the Novel Superfluidity in the Second Layer of ${}^4$He on Graphite
• Quantum Monte Carlo study of few- and many-body Bose systems in one and two dimensions