Mechanism of remote vacancy emergence by a supersonic crowdion cluster in a 2D Morse lattice

Shepelev, Igor A.; Bachurin, D.V.; Korznikova, Elena A.; Bayazitov, Ayrat M.

doi:10.1016/j.cjph.2021.01.010

Cited by 11 publications

(4 citation statements)

References 37 publications

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“…Recently, in addition to ‘classical’ 1-crowdion, the so-called N -, M -, and

-crowdions have been intensively studied [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. In the first case, the initial momentum is imparted to N neighboring atoms located in the same close-packed row along the row; in the second case, to a group of atoms in M neighboring atomic rows; and in the third case, to

block of atoms.…”

Section: Introductionmentioning

confidence: 99%

“…Based on this, the authors [ 27 ] concluded that such crowdion clusters can play an important role in mass transfer from the surface into the bulk. Vacancy can also exist in a delocalized form, which is called voidion [ 29 , 36 , 37 ]. Both interstitial [ 7 , 24 ] and vacancy clusters [ 38 , 39 ] can exhibit cooperative one-dimensional motion.…”

Section: Introductionmentioning

confidence: 99%

“…Both interstitial [ 7 , 24 ] and vacancy clusters [ 38 , 39 ] can exhibit cooperative one-dimensional motion. Propagation of

-crowdions can be accompanied with a formation of atomic vacancies inside the crystal lattice [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Supersonic Motion of Atoms in an Octahedral Channel of fcc Copper

et al. 2022

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In this work, the mass transfer along an octahedral channel in an fcc copper single crystal is studied for the first time using the method of molecular dynamics. It is found that the initial position of the bombarding atom, outside or inside the crystal, does not noticeably affect the dynamics of its motion. The higher the initial velocity of the bombarding atom, the deeper its penetration into the material. It is found out how the place of entry of the bombarding atom into the channel affects its further dynamics. The greatest penetration depth and the smallest dissipation of kinetic energy occurs when the atom moves exactly in the center of the octahedral channel. The deviation of the bombarding atom from the center of the channel leads to the appearance of other velocity components perpendicular to the initial velocity vector and to an increase in its energy dissipation. Nevertheless, the motion of an atom along the channel is observed even when the entry point deviates from the center of the channel by up to 0.5 Å. The dissipated kinetic energy spent on the excitation of the atoms forming the octahedral channel is nearly proportional to the deviation from the center of the channel. At sufficiently high initial velocities of the bombarding atom, supersonic crowdions are formed, moving along the close-packed direction ⟨1¯10⟩, which is perpendicular to the direction of the channel. The results obtained are useful for understanding the mechanism of mass transfer during ion implantation and similar experimental techniques.

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“…Recently, in addition to ‘classical’ 1-crowdion, the so-called N -, M -, and

block of atoms.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Supersonic Motion of Atoms in an Octahedral Channel of fcc Copper

et al. 2022

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“…Mechanisms of energy localization and transport in nonlinear discrete systems are attracting a lot of attention from physicists because they play a decisive role in a variety of processes. Topological solitons [1,2], shock waves [3][4][5], crowdions [6][7][8], discrete breathers [9][10][11][12][13], modes localized on defects [14], rotobreathers [15,16] are examples of spatially localized objects that exist in nonlinear lattices.…”

Section: Introductionmentioning

confidence: 99%

Rotobreathers in a chain of coupled elastic rotators

Savin,

Sunagatova,

Dmitriev

2021

Preprint

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Rotobreathers in the chain of coupled linearly elastic rotators are analyzed. Each rotator is a particle connected by a massless elastic rod with a frictionless pivot; it has two degrees of freedom, length and angle of rotation. The rods of the rotators and the elastic bonds between the nearest rotators are linearly elastic, and the nonlinearity of the system is of a purely geometric nature. It is shown that long-lived rotobreathers can exist if the stiffness of the rods is high enough to create a relatively wide gap in the phonon spectrum of the chain. The frequency of angular rotation of the rotobreather cannot be above the optical band of the phonon spectrum and is in the spectrum gap. Generally speaking, the rotation of the rotobreather is accompanied by radial oscillations, however, one can choose such initial conditions so that the radial oscillations are minimal. Some parameters of rotobreathers with minimal radial vibrations are presented on the basis of numerical simulations. The results obtained qualitatively describe the behavior of physical systems with coupled rotators.

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