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arXiv · 1103.3583

Supersolidity in quantum films adsorbed on graphene and graphite

M. C. Gordillo·C. Cazorla·J. Boronat
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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 $\sqrt3 \times \sqrt3$ 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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M. C. Gordillo, C. Cazorla, J. Boronat. 2011-03-18. Supersolidity in quantum films adsorbed on graphene and graphite. https://doi.org/10.1103/physrevb.83.121406

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