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Title: Evidence of Directional Structural Superlubricity and Lévy Flights in a van der Waals Heterostructure

Journal Article · · Small
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1]
  1. Faculty of Physics and Applied Informatics University of Lodz Pomorska 149/153 Lodz 90‐236 Poland
  2. Elettra‐Sincrotrone Trieste S.C.p.A. Strada Statale 14 ‐ km 163,5 in AREA Science Park, Basovizza 34149 Trieste Italy
  3. Department of Physics and Astronomy University of Missouri Columbia MO 65211 United States
  4. Department of Physics University of Illinois at Urbana‐Champaign Urbana IL 61801‐3080 United States
  5. The MacDiarmid Institute for Advanced Materials and Nanotechnology University of Canterbury Christchurch 8140 New Zealand

Abstract 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 (2D crystals with hexagonal or triangular crystalline symmetries, leading to isotropic frictionless contacts. Directional structural superlubricity, to date unrealized in 2D systems, is possible when the reciprocal lattices of the two crystals coincide in one direction only. Here, directional structural superlubricity a α‐bismuthene/graphite van der Waals system is evidenced, manifested by spontaneous hopping of the islands over hundreds of nanometers 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 Lévy flight dynamics, largely unobserved in condensed‐matter systems.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; FG02-07ER46383; SC0024294
OSTI ID:
2479935
Journal Information:
Small, Journal Name: Small Journal Issue: 6 Vol. 21; ISSN 1613-6810
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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