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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.16709 |
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| _version_ | 1866910730365698048 |
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| author | Ster, Maxime Le Krukowski, Paweł Rogala, Maciej Dabrowski, Paweł Lutsyk, Iaroslav Toczek, Klaudia Podlaski, Krzysztof Mendeş, Tefvik O. Genuzio, Francesca Locatelli, Andrea Bian, Guan Chiang, Tai-Chang Brown, Simon A. Kowalczyk, Paweł J. |
| author_facet | Ster, Maxime Le Krukowski, Paweł Rogala, Maciej Dabrowski, Paweł Lutsyk, Iaroslav Toczek, Klaudia Podlaski, Krzysztof Mendeş, Tefvik O. Genuzio, Francesca Locatelli, Andrea Bian, Guan Chiang, Tai-Chang Brown, Simon A. Kowalczyk, Paweł J. |
| contents | Structural superlubricity is a special frictionless contact in which two crystals are in incommensurate arrangement such that relative in-plane translation is associated with vanishing energy barrier crossing. So far, it has been realized in multilayer graphene and other van der Waals two-dimensional crystals with hexagonal or triangular crystalline symmetries, leading to isotropic frictionless contacts. Directional structural superlubricity, to date unrealized in two-dimensional systems, is possible when the reciprocal lattices of the two crystals coincide in one direction only. Here, we evidence directional structural superlubricity a $α$-bismuthene/graphite van der Waals system, manifested by spontaneous hopping of the islands over hundreds of nanometres at room temperature, resolved by low-energy electron microscopy and supported by registry simulations. Statistical analysis of individual and collective $α$-bismuthene islands populations reveal a heavy-tailed distribution of the hopping lengths and sticking times indicative of L{é}vy flight dynamics, largely unobserved in condensed-matter systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_16709 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence of directional structural superlubricity and Lévy flights in a van der Waals heterostructure Ster, Maxime Le Krukowski, Paweł Rogala, Maciej Dabrowski, Paweł Lutsyk, Iaroslav Toczek, Klaudia Podlaski, Krzysztof Mendeş, Tefvik O. Genuzio, Francesca Locatelli, Andrea Bian, Guan Chiang, Tai-Chang Brown, Simon A. Kowalczyk, Paweł J. Mesoscale and Nanoscale Physics Materials Science Structural superlubricity is a special frictionless contact in which two crystals are in incommensurate arrangement such that relative in-plane translation is associated with vanishing energy barrier crossing. So far, it has been realized in multilayer graphene and other van der Waals two-dimensional crystals with hexagonal or triangular crystalline symmetries, leading to isotropic frictionless contacts. Directional structural superlubricity, to date unrealized in two-dimensional systems, is possible when the reciprocal lattices of the two crystals coincide in one direction only. Here, we evidence directional structural superlubricity a $α$-bismuthene/graphite van der Waals system, manifested by spontaneous hopping of the islands over hundreds of nanometres at room temperature, resolved by low-energy electron microscopy and supported by registry simulations. Statistical analysis of individual and collective $α$-bismuthene islands populations reveal a heavy-tailed distribution of the hopping lengths and sticking times indicative of L{é}vy flight dynamics, largely unobserved in condensed-matter systems. |
| title | Evidence of directional structural superlubricity and Lévy flights in a van der Waals heterostructure |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2406.16709 |