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Article overview
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Superlubric-Pinned Transition in Sliding Incommensurate Colloidal Monolayers | | Davide Mandelli
; Andrea Vanossi
; Michele Invernizzi
; S. V. Paronuzzi Ticco
; Nicola Manini
; Erio Tosatti
; | | Date: |
1 Aug 2015 | | Abstract: | Two-dimensional (2D) crystalline colloidal monolayers sliding over a
laser-induced optical lattice recently emerged as a new tool for the study of
friction between ideal crystal surfaces. Here we focus in particular on static
friction, the minimal sliding force necessary to depin one lattice from the
other. If the colloid and the optical lattices are mutually commensurate, the
colloid sliding is always pinned by static friction; but when they are
incommensurate the presence or absence of pinning can be expected to depend
upon the system parameters. If a 2D analogy to the mathematically established
Aubry transition of one-dimensional systems were to hold, an increasing
periodic corrugation strength $U_0$ should turn an initially free-sliding
monolayer into a pinned state through a well-defined dynamical phase
transition. We address this problem by the simulated sliding of a realistic
model 2D colloidal lattice, confirming the existence of a clear and sharp
superlubric-pinned transition for increasing corrugation strength. Unlike the
1D Aubry transition which is continuous, the 2D transition exhibits a definite
first-order character. With no change of symmetry, the transition entails a
structural character, with a sudden increase of the colloid-colloid interaction
energy, accompanied by a compensating downward jump of the colloid-corrugation
energy. The transition value for the corrugation amplitude $U_0$ depends upon
the misalignment angle $ heta$ between the optical and the colloidal lattices,
superlubricity surviving until larger corrugations for angles away from the
energetically favored orientation, which is itself generally slightly
misaligned, as shown in recent work. The observability of the
superlubric-pinned colloid transition is proposed and discussed. | | Source: | arXiv, 1508.0147 | | Services: | Forum | Review | PDF | Favorites | |
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