Understanding the drift motion and dynamical locking of crystalline clusters on patterned substrates is important for the diffusion and manipulation of nano- and microscale objects on surfaces. In a previous work, we studied the orientational and directional locking of colloidal two-dimensional clusters with triangular structure driven across a triangular substrate lattice. Here we show with experiments and simulations that such locking features arise for clusters with arbitrary lattice structure sliding across arbitrary regular substrates. Similar to triangular-triangular contacts, orientational and directional locking are strongly correlated via the real- and reciprocal-space Moiré patterns of the contacting surfaces. Due to the different symmetries of the surfaces in contact, however, the relation between the locking orientation and the locking direction becomes more complicated compared to interfaces composed of identical lattice symmetries. We provide a generalized formalism which describes the relation between the locking orientation and locking direction with arbitrary lattice symmetries.

Pervasive orientational and directional locking at geometrically heterogeneous sliding interfaces / X. Cao, E. Panizon, A. Vanossi, N. Manini, E. Tosatti, C. Bechinger. - In: PHYSICAL REVIEW. E. - ISSN 2470-0045. - 103:1(2021 Jan 13). [10.1103/PhysRevE.103.012606]

Pervasive orientational and directional locking at geometrically heterogeneous sliding interfaces

N. Manini;
2021

Abstract

Understanding the drift motion and dynamical locking of crystalline clusters on patterned substrates is important for the diffusion and manipulation of nano- and microscale objects on surfaces. In a previous work, we studied the orientational and directional locking of colloidal two-dimensional clusters with triangular structure driven across a triangular substrate lattice. Here we show with experiments and simulations that such locking features arise for clusters with arbitrary lattice structure sliding across arbitrary regular substrates. Similar to triangular-triangular contacts, orientational and directional locking are strongly correlated via the real- and reciprocal-space Moiré patterns of the contacting surfaces. Due to the different symmetries of the surfaces in contact, however, the relation between the locking orientation and the locking direction becomes more complicated compared to interfaces composed of identical lattice symmetries. We provide a generalized formalism which describes the relation between the locking orientation and locking direction with arbitrary lattice symmetries.
Settore FIS/03 - Fisica della Materia
Understanding and Tuning FRiction through nanOstructure Manipulation (UTFROM)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/842624
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