Supersolidity in quantum films adsorbed on graphene and graphite

Details Supersolidity in quantum films adsorbed on graphene and graphite Supersolidity in quantum films adsorbed on graphene and graphite

2011-03-18

arxiv.org/abs/1103.3583v1

Physics

Condensed Matter

Other Condensed Matter

5 pages, accepted for publication in PRB

Scientific paper

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 $\sqrt3 \times \sqrt3$ 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.

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