Supersolidity in quantum films adsorbed on graphene and graphite

Abstract

Using quantum Monte Carlo we have studied the superfluid density of the first layer of ${}^4$He and H${}_2$ adsorbed on graphene and graphite. Our main focus has been on the equilibrium ground state of the system, which corresponds to a registered $\sqrt{3}\times \sqrt{3}$ phase. The perfect solid phase of H${}_2$ shows no superfluid signal whereas ${}^4$He has a finite but small superfluid fraction (0.67%). The introduction of vacancies in the crystal makes the superfluidity increase, showing values as large as 14% in ${}^4$He without destroying the spatial solid order.

5 pages, accepted for publication in PRB

References in corpus (6)

• What makes a crystal supersolid ?
• Phase diagram of 4He adsorbed on graphite
• 4He on a single graphene sheet
• Bose-Einstein Quantum Statistics and the Ground State of Solid 4He
• Phase diagram of H2 adsorbed on graphene
• Ground-state properties and superfluidity of two- and quasi two-dimensional solid 4He

Cited by in corpus (20)

• Simulation and understanding of quantum crystals
• Phase diagram of ${}^4$He on graphene
• Layering transitions in superfluid helium adsorbed on a carbon nanotube mechanical resonator
• Adsorption by design: tuning atom-graphene van der Waals interactions via mechanical strain
• Novel behaviors of monolayer quantum gases on Graphene, Graphane and Fluorographene
• Superfluid and supersolid phases of 4He on the second layer of graphite
• Liquid and solid phases of 3He on graphite
• The elastic constants of solid 4He under pressure: a diffusion Monte Carlo study
• Two-Dimensional Bose-Hubbard Model for Helium on Graphene
• First-principles modeling of three-body interactions in highly compressed solid helium
• Possible superfluidity of molecular hydrogen in a two-dimensional crystal phase of sodium
• A Perspective on Collective Properties of Atoms on 2D Materials
• 3He on preplated graphite
• Strain-induced superfluid transition for atoms on graphene
• Second layer of H2 and D2 adsorbed on graphene
• Supersolidity in the second layer of $para$-H${}_2$ adsorbed on graphite
• Fluid and registered phases in the second layer of 3He on graphite
• Phases of ${}^4$He and H${}_2$ adsorbed on a single carbon nanotube
• Effects of substrate corrugation during helium adsorption on graphene in the grand canonical ensemble
• He-4 monolayer on Graphene: a Quantum Monte Carlo study