Exchange-driven self-diffusion of nanoscale crystalline parahydrogen clusters on graphite
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911245447200768 |
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| author | Kolevski, K. M. Boninsegni, M. |
| author_facet | Kolevski, K. M. Boninsegni, M. |
| contents | Computer simulations yield evidence of superfluid behavior of nanoscale size clusters of parahydrogen adsorbed on a graphite substrate at low temperature ($T\lesssim 0.25 \text{ K}$). Clusters with a number of molecules between 7 and 12 display concurrent superfluidity and crystalline order, reflecting the corrugation of the substrate. Remarkably, it is found that specific clusters with a number of molecules ranging between 7 and 12 self-diffuse on the surface like free particles, despite the strong pinning effect of the substrate. This effect is underlain by coordinated quantum-mechanical exchanges of groups of identical molecules, i.e., it has no classical counterpart. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_10883 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exchange-driven self-diffusion of nanoscale crystalline parahydrogen clusters on graphite Kolevski, K. M. Boninsegni, M. Other Condensed Matter Computer simulations yield evidence of superfluid behavior of nanoscale size clusters of parahydrogen adsorbed on a graphite substrate at low temperature ($T\lesssim 0.25 \text{ K}$). Clusters with a number of molecules between 7 and 12 display concurrent superfluidity and crystalline order, reflecting the corrugation of the substrate. Remarkably, it is found that specific clusters with a number of molecules ranging between 7 and 12 self-diffuse on the surface like free particles, despite the strong pinning effect of the substrate. This effect is underlain by coordinated quantum-mechanical exchanges of groups of identical molecules, i.e., it has no classical counterpart. |
| title | Exchange-driven self-diffusion of nanoscale crystalline parahydrogen clusters on graphite |
| topic | Other Condensed Matter |
| url | https://arxiv.org/abs/2508.10883 |