Dynamics of friction: superlubric state

Shinjo, Kazumasa; Hirano, Motohisa

doi:10.1016/0039-6028(93)91022-h

Cited by 323 publications

(170 citation statements)

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“…23,27,28 The possibility has been suggested that two incommensurate surfaces can slide over one another without any friction. 23,27,28 Some studies predict that this could happen even in metallic systems. 28 In order to investigate the effect of interfacial mismatch on the frictional properties, a series of simulations have been performed for a system like the one in Fig.…”

Section: B Cu"111… Tip/cu"111… Surface Nonmatching Surfacesmentioning

confidence: 99%

“…This is called superlubricity. 27 In the case of strongly interacting surfaces, nonadiabatic motion can occur, and this gives rise to kinetic friction.…”

Section: Introductionmentioning

confidence: 99%

“…In a subsequent publication, they stress that in high dimensional systems, superlubricity can appear even for strongly interacting surfaces. 27 Sliding friction at the atomic level has been studied by molecular dynamics ͑MD͒ simulations by several authors. Landman and co-workers have found atomic-scale stick and slip behavior when shearing a Si tip on a Si͑111͒ surface 29 and a CaF 2 tip on a CaF 2 substrate.…”

Section: Introductionmentioning

confidence: 99%

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Simulations of atomic-scale sliding friction

1996

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Simulation studies of atomic-scale sliding friction have been performed for a number of tip-surface and surface-surface contacts consisting of copper atoms. Both geometrically very simple tip-surface structures and more realistic interface necks formed by simulated annealing have been studied. Kinetic friction is observed to be caused by atomic-scale stick and slip which occurs by nucleation and subsequent motion of dislocations preferably between close-packed ͕111͖ planes. Stick and slip seems to occur in different situations. For single crystalline contacts without grain boundaries at the interface the stick and slip process is clearly observed for a large number of contact areas, normal loads, and sliding velocities. If the tip and substrate crystal orientations are different so that a mismatch exists in the interface, the stick and slip process is more fragile. It is then caused by local pinning of atoms near the boundary of the interface and is therefore more easily observed for smaller contacts. Depending on crystal orientation and load, frictional wear can also be seen in the simulations. In particular, for the annealed interface necks which model contacts created by scanning tunneling microscope/ atomic force microscope tip indentations the sliding process involves breaking contacts leaving tip material behind on the substrate.

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Section: B Cu"111… Tip/cu"111… Surface Nonmatching Surfacesmentioning

confidence: 99%

“…This is called superlubricity. 27 In the case of strongly interacting surfaces, nonadiabatic motion can occur, and this gives rise to kinetic friction.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulations of atomic-scale sliding friction

1996

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“…In this case the atoms at the bottom surface cannot adjust to the corrugated substrate potential, and (for an incommensurate system) as some atoms move downhill other atoms move uphill in such a way that the total energy is constant. Thus, no elastic instabilities will occur during sliding, resulting in a very low sliding friction; this state has been termed superlubric [7]. However, when the block is elastically soft (figure 1(e)), the atoms can rearrange themselves so that at any moment in time almost all the atoms occupy positions close to the minima of the substrate potential.…”

Section: Introductionmentioning

confidence: 99%

Role of surface roughness in superlubricity

Tartaglino

Самойлов

Persson

2006

J. Phys.: Condens. Matter

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We study the sliding of elastic solids in adhesive contact with flat and rough interfaces. We consider the dependence of the sliding friction on the elastic modulus of the solids. For elastically hard solids with planar surfaces with incommensurate surface structures we observe extremely low friction (superlubricity), which very abruptly increases as the elastic modulus decreases. We show that even a relatively small surface roughness may completely kill the superlubricity state.

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“…1(a) and 1(b)] [33][34][35]. To date, we have used the emulator to study the velocity dependence of nanofriction [30], as well as the interplay between superlubricity [31,[36][37][38][39] and the Aubry transition [32]. These studies and a recent study of zigzag ion chains [40] have focused on the single-slip regime.…”

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confidence: 99%

Multislip Friction with a Single Ion

et al. 2017

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A trapped ion transported along a periodic potential is studied as a paradigmatic nanocontact frictional interface. The combination of the periodic corrugation potential and a harmonic trapping potential creates a one-dimensional energy landscape with multiple local minima, corresponding to multistable stick-slip friction. We measure the probabilities of slipping to the various minima for various corrugations and transport velocities. The observed probabilities show that the multislip regime can be reached dynamically at smaller corrugations than would be possible statically, and can be described by an equilibrium Boltzmann model. While a clear microscopic signature of multislip behavior is observed for the ion motion, the frictional force and dissipation are only weakly affected by the transition to multistable potentials. DOI: 10.1103/PhysRevLett.119.043601 Stick-slip friction is a ubiquitous nonequilibrium dynamical process that occurs at the interface between surfaces across a wide range of length scales [1][2][3][4][5][6]. The term stick slip describes the system's response to an applied shear force: the surfaces slip out of a local minimum in the interface energy landscape, and stick into a new lowerenergy minimum, releasing heat in the process.Recent advances in atomic force microscopy (AFM) have extended the study of stick-slip friction to the atomic scale, where atom-by-atom slips occur at the interface between a probe tip and a periodic substrate [7][8][9][10][11][12][13][14][15][16][17][18]. For a single-atom probe, the number of local minima in the probe-substrate interaction potential is determined by the ratio of the periodic substrate potential to the spring constant with which the probe is bound to its support object. As the load on the probe is increased, or equivalently, the periodic substrate potential is deepened, the system transitions from a bistable regime (where the probe deterministically single slips from the first minimum to the second) to a multistable regime (where a probe can stochastically multislip to one of several local minima). This has been demonstrated in AFM simulations [19][20][21][22] and experiments [23][24][25] where single-slip and multislip events have been clearly differentiated. However, in the absence of control over dissipation rates and the microscopic energy landscape, it is difficult to tie the observations to ab initio friction models.Following theoretical proposals [26][27][28][29], we have recently demonstrated a trapped-ion friction emulator with extensive control over all microscopic interface parameters [30][31][32]. In analogy to AFM, the emulator features a small probe (one or several trapped ions) transported over a In this Letter, we study multislip friction in deep substrate potentials. We observe the ion fluorescence associated with slip events, from which we directly extract the temperature-and velocity-dependent probabilities for the ion to localize in one of the available local minima. We find that at finite rethermalization times following a s...

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Dynamics of friction: superlubric state

Cited by 323 publications

References 9 publications

Simulations of atomic-scale sliding friction

Simulations of atomic-scale sliding friction

Role of surface roughness in superlubricity

Multislip Friction with a Single Ion

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