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

Journal Article · Sat Dec 15 04:00:00 EST 2018 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776118120063· OSTI ID:22917842

Shepelev, I. A.; Chetverikov, A. P. ^[1]; Dmitriev, S. V. ^[2]; Fomin, S. Yu. ^[3]; Zhou, Kun ^[4]

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1. Saratov Chernyshevsky National Research State University (Russian Federation)
2. Institute for Metals Superplasticity Problems, Russian Academy of Sciences (Russian Federation)
3. Ufa State Aviation Technical University (Russian Federation)
4. School of Mechanical and Aerospace Engineering, Nanyang Technological University (Singapore)

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 M-crowdions. 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.

• OSTI ID: 22917842
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 6 Vol. 127; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOMS
CROWDIONS
CRYSTALS
DISLOCATIONS
INTERSTITIALS
MOLECULAR DYNAMICS METHOD
MORSE POTENTIAL
SIMULATION
TWO-DIMENSIONAL SYSTEMS