تقرير
Evidence of directional structural superlubricity and L\'evy flights in a van der Waals heterostructure
| العنوان: | Evidence of directional structural superlubricity and L\'evy flights in a van der Waals heterostructure |
|---|---|
| المؤلفون: | 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. |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| الوصف: | 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 $\alpha$-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 $\alpha$-bismuthene islands populations reveal a heavy-tailed distribution of the hopping lengths and sticking times indicative of L{\'e}vy flight dynamics, largely unobserved in condensed-matter systems. Comment: 14 pages, 10 figures (including Supplementary Information and Supplementary Figures) |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2406.16709 |
| رقم الأكسشن: | edsarx.2406.16709 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |