Abstract
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.
| Original language | English |
|---|---|
| Article number | 144527 |
| Journal | Physical Review B |
| Volume | 102 |
| Issue number | 14 |
| DOIs | |
| State | Published - Oct 30 2020 |
| Externally published | Yes |
Funding
Y.K. was supported by the Basic Science Research Program (2018R1D1A1B07042443) through the National Research Foundation of Korea funded by the Ministry of Education. J.-S.K. was supported by the National Research Foundation of Korea though Grants No. NRF-2016R1D1A1B03930532 and No. NRF-2019R1F1A1040955. T.J.V. acknowledges support from the Laboratory Directed Research and Development program at Los Alamos National Laboratory. We also acknowledge the support from the Supercomputing Center/Korea Institute of Science and Technology Information with supercomputing resources including technical support (KSC-2019-CRE-0200).
| Funders | Funder number |
|---|---|
| Laboratory Directed Research and Development | |
| Los Alamos National Laboratory | |
| Ministry of Education | NRF-2019R1F1A1040955, NRF-2016R1D1A1B03930532 |
| National Research Foundation of Korea |