Supersonic voidions in 2D Morse lattice

I.A. Shepelev, S.V. Dmitriev, A.A. Kudreyko, M.G. Velarde and E.A. Korznikova

Chaos, Solitons & Fractals, 2020, vol. 140, issue C

Abstract: Dynamics of M × 1-crowdion clusters (M=1, 2 or 3) and vacancy clusters is analyzed in 2D triangular lattice with Morse interactions. Topological defects are created in the lattice by kicking three neighboring atoms in the three neighboring close-packed atomic rows along the rows. Initial velocity of the atoms in the inner row, vinn, can be positive or negative, while the velocities of both atoms in the outer rows, vout, are equal and positive. The case of vinn=vout was analysed earlier and it was found that if the initial velocity is sufficiently large then a 3 × 1-crowdion cluster and a three-vacancy are formed. Two major effects are reported in the case of vinn ≠ vout analyzed here. (i) Due to the difference in the initial velocities, topological defects can be produced in the lattice with smaller initial energy than in the case of vinn=vout. (ii) In certain range of the initial velocities, a vacancy can appear at a distance of dozens interatomic distances from the initiation point, moving along the close-packed row with supersonic speed. Such moving vacancy is called voidion and mechanism of its formation and motion is revealed. Our results uncover new mechanisms of mass transfer by solitary waves in nonlinear lattices.

Keywords: Crystal lattice; Atomistic simulations; Nonliner dynamics; Crowdions; Mass transfer (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960077920306135
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:140:y:2020:i:c:s0960077920306135

DOI: 10.1016/j.chaos.2020.110217

Access Statistics for this article

Chaos, Solitons & Fractals is currently edited by Stefano Boccaletti and Stelios Bekiros

More articles in Chaos, Solitons & Fractals from Elsevier
Bibliographic data for series maintained by Thayer, Thomas R. ().