Subsonic M, N-crowdions in 2D Morse crystal

• Published in: IOP conference series. Materials Science and Engineering Vol. 447; no. 1; pp. 12030 - 12033
• Main Authors: Korznikova, E A, Shepelev, I A, Chetverikov, A P, Fomin, S Yu, Dmitriev, S V
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 21.11.2018
• Subjects: Crowdions; Crystal defects; Crystal lattices; Mass transfer; Nanoparticles
• ISSN: 1757-8981; 1757-899X; 1757-899X
• DOI: 10.1088/1757-899X/447/1/012030

Crowdion is a zero-dimensional defect of the crystal lattice in the form of an extra atom in a close-packed atomic row. Crowdions can be at rest or move with subsonic or supersonic velocity. A moving crowdion transports the mass of one atom. Recently it has been revealed that crowdion clusters can be more efficient in mass transfer as compared to single crowdions. For example, in our recent work it has been shown that a supersonic N-crowdion can be excited by giving a sufficiently large equal initial momentum to N neighbouring atoms in a close-packed row along the row. This work presents an extension of the concept of N-crowdion to M, N-crowdion, the latter one is excited in a 2D crystal by the initial kick of a block of M×N atoms along a close-packed direction. The effect of the initial velocity on the dynamics of M, N-crowdions is analysed for various values of M and N. It is revealed that the initial velocity affects not only the propagation length, but also the resulting defect configurations. It is suggested that M,N-crowdions can be initiated from the surface by bombardment with nanoparticles...