Hysteresis from dynamically pinned sliding states

Vanossi, Andrea; Santoro, Giuseppe E.; Manini, Nicola; Cesaratto, Marco; Tosatti, Erio

doi:10.1016/j.susc.2007.07.015

Cited by 12 publications

(19 citation statements)

References 9 publications

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“…8 and 9 for the kink and the anti-kink geometries, respectively, depicting typical scans where v ext is cycled adiabatically up and down in small steps. Like in the T = 0 simulations of the 1D sliding model, 7,8,12 and as is well known for the static pinning/depinning of the standard FK model, [21][22][23] the present 2D model displays a clear hysteretic behavior of the velocity-plateau state (panels (a)), provided that thermal fluctuations are much smaller than the energy barrier hindering the full exploration of phase space for any affordable simulation time. A clear correlation of F k with the effective lubricant temperature k B T eff ∝ E k cm (panels Fig.…”

Section: Frictionsupporting

confidence: 70%

“…8 In particular, within the plateau, the T = 0 calculation shows perfect matching of the mean lubricant velocity to the geometric ratio w plat of Eq. (12). By increasing the temperature, w deviates more and more from the perfect plateau value.…”

Section: The Robustness Of the Plateau Dynamicsmentioning

confidence: 92%

“…The occurrence of this surprising and robust regime of motion, giving rise to perfectly flat plateaus in the ratio of the timeaveraged lubricant center-of-mass (CM) velocity to the externally imposed relative speed, was ascribed to the intrinsic topological nature of this quantized dynamics. The phenomenon, investigated in detail in a rather idealized 1D geometry, [9][10][11][12][13][14] was explained by the corrugation of a sliding confining wall rigidly dragging the topological solitons (kinks or antikinks) that the embedded lubricant structure forms with the other substrate. Evidence of the existence of this peculiar regime of motion was then confirmed shortly after for a substantially less idealized 2D model of boundary lubrication, where atoms were allowed to move perpendicularly to the sliding direction and interacted via LJ potentials 15 .…”

Section: Introductionmentioning

confidence: 99%

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Tribology of the lubricant quantized sliding state

Castelli

Capozza

Vanossi

et al. 2009

The Journal of Chemical Physics

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In the framework of Langevin dynamics, we demonstrate clear evidence of the peculiar quantized sliding state, previously found in a simple one-dimensional boundary lubricated model [A. Vanossi et al., Phys. Rev. Lett. 97, 056101 (2006)], for a substantially less idealized two-dimensional description of a confined multilayer solid lubricant under shear. This dynamical state, marked by a nontrivial "quantized" ratio of the averaged lubricant center-of-mass velocity to the externally imposed sliding speed, is recovered, and shown to be robust against the effects of thermal fluctuations, quenched disorder in the confining substrates, and over a wide range of loading forces. The lubricant softness, setting the width of the propagating solitonic structures, is found to play a major role in promoting in-registry commensurate regions beneficial to this quantized sliding. By evaluating the force instantaneously exerted on the top plate, we find that this quantized sliding represents a dynamical "pinned" state, characterized by significantly low values of the kinetic friction. While the quantized sliding occurs due to solitons being driven gently, the transition to ordinary unpinned sliding regimes can involve lubricant melting due to large shear-induced Joule heating, for example at large speed.

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Section: Frictionsupporting

confidence: 70%

Section: The Robustness Of the Plateau Dynamicsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tribology of the lubricant quantized sliding state

Castelli

Capozza

Vanossi

et al. 2009

The Journal of Chemical Physics

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“…1. We start investigating the plateau destruction/recovery induced by varying the external force F ext through a sequence of adiabatic increases and decreases [17]. The resulting CM velocity is displayed in Fig.…”

Section: Resultsmentioning

confidence: 99%

Nonlinear hysteretic behavior of a confined sliding layer

Manini

Santoro

Tosatti

et al. 2008

J. Phys.: Condens. Matter

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A nonlinear model representing the tribological problem of a thin solid lubricant layer between two sliding periodic surfaces is used to analyze the phenomenon of hysteresis at pinning/depinning around a moving state rather than around a statically pinned state. The cycling of an external driving force Fext is used as a simple means to destroy and then to recover the dynamically pinned state previously discovered for the lubricant center-of-mass velocity. De-pinning to a quasi-freely sliding state occurs either directly, with a single jump, or through a sequence of discontinuous transitions. The intermediate sliding steps are reminiscent of phase-locked states and stick-slip motion in static friction, and can be interpreted in terms of the appearance of travelling density defects in an otherwise regular arrangement of kinks. Re-pinning occurs more smoothly, through the successive disappearance of different travelling defects. The resulting bistability and multistability regions may also be explored by varying mechanical parameters other than Fext, e.g. the sliding velocity or the corrugation amplitude of the sliders.

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“…[40,41,42,43,44,45,46,47,48,49,50,51]. The results of sliding simulation for w = 1/14, corresponding to ρ = 14/15, are shown in Fig.…”

Section: ρ = 14/15mentioning

confidence: 99%

Subharmonic Shapiro steps of sliding colloidal monolayers in optical lattices

Ticco

Fornasier

Manini

et al. 2016

J. Phys.: Condens. Matter

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Abstract. We investigate theoretically the possibility to observe dynamical mode locking, in the form of Shapiro steps, when a time-periodic potential or force modulation is applied to a two-dimensional (2D) lattice of colloidal particles that are dragged by an external force over an optically generated periodic potential. Here we present realistic molecular dynamics simulations of a 2D experimental setup, where the colloid sliding is realized through the motion of soliton lines between locally commensurate patches or domains, and where the Shapiro steps are predicted and analyzed. Interestingly, the jump between one step and the next is seen to correspond to a fixed number of colloids jumping from one patch to the next, across the soliton line boundary, during each AC cycle. In addition to ordinary "integer" steps, coinciding here with the synchronous rigid advancement of the whole colloid monolayer, our main prediction is the existence of additional smaller "subharmonic" steps due to localized solitonic regions of incommensurate layers executing synchronized slips, while the majority of the colloids remains pinned to a potential minimum. The current availability and wide parameter tunability of colloid monolayers makes these predictions potentially easy to access in an experimentally rich 2D geometrical configuration.

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Hysteresis from dynamically pinned sliding states

Cited by 12 publications

References 9 publications

Tribology of the lubricant quantized sliding state

Tribology of the lubricant quantized sliding state

Nonlinear hysteretic behavior of a confined sliding layer

Subharmonic Shapiro steps of sliding colloidal monolayers in optical lattices

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