Two-dimensional superfluidity in He 4 clusters intercalated into graphite

초록

Motivated by recent technical developments on selective intercalation of inert gases just beneath the surface graphene of graphite, we perform path-integral Monte Carlo calculations to study structural and superfluid properties of He4 clusters encapsulated between a bulged surface graphene layer and the graphite (0001) substrate. The intercalated He4 atoms initially decorate the inner surface of the bulged graphene to form a shell structure, leaving a void inside it. Then, the additional He4 atoms form a disk-shaped liquid platelet in the void, which shows finite superfluid response at temperatures below 1 K. The temperature-dependent superfluid fractions of the platelet follow modified Kosterlitz-Thouless recursion relations, indicating that two-dimensional superfluidity can be realized in an intercalated He4 system. © 2020 American Physical Society.

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