Dynamics and Stability of Subsonic Crowdion Clusters in 2D Morse Crystal

Abstract

Recently, the concept of supersonic N-crowdions was offered. In molecular dynamics simulations, they can be excited by initial kick of N neighboring atoms located in one close-packed atomic row along this row. In the present study, in 2D Morse crystal, we apply initial kick to M neighboring atoms located in neighboring close-packed atomic rows along these rows. This way, we initiate crowdion clusters called subsonic Mcrowdions. It is well known that static 1-crowdion in 2D Morse lattice is unstable; as a result, the interstitial atom leaves the close-packed atomic row and becomes immobile. However, we show that 1-crowdion moving with sufficiently large subsonic velocity remains in the close-packed atomic row. Crowdion clusters with M equal to or greater than 2 appear to be stable even at rest, with growing M transforming into prismatic dislocation loops. It is important to note that stable subsonic M-crowdions (M > 1) remain mobile and they can carry interstitial atoms over long distances.

Supersonic Motion of Atoms in an Octahedral Channel of fcc Copper

“…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.…”

Fischer Tropsch Synthesis: The Promoter Effects, Operating Conditions, and Reactor SynthesisThe authors gratefully acknowledge University of Sistan and Baluchestan for helping and supporting this research.Majid Sarkari:Young Researchers Club, Shiraz Branch, Islamic Azad University, Shiraz, Iran. Farhad Fazlollahi: Department of Chemical Engineering, Science and Research Branch, Islamic Azad University, Fars, Iran. Hossein Atashi: Department of Chemical Engineering, Faculty of Engineering, University of Sis

“…[2][3][4][5][6]. The case of strong discreteness is of particular interest and it is encountered in many applications, for example, in the description of arrays of Josephson junctions [7], dissipative nonlinear discrete systems [8], dynamics of crowdions [9][10][11][12][13] and dislocations [14][15][16] in crystals, propagation of domain walls in magnetic materials [17], motion of spring-mass chains [18], in the discussion of electric charge transport in molecular chains [19]. The consideration of the strongly discrete (anti-continuum) limit is a well-known approach aiming towards the analytical treatment of discrete breathers [20,21].…”