Half-Solidity of Tetrahedral-like Al-55 Clusters

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A new dynamic melting state, which has both solid and liquid characteristics, is revealed from first-principles molecular dynamics simulations of Al-55 clusters. In thermal fluctuations near the melting point, the low-energy tetrahedral-like Al-55 survives through rapid, collective surface transformations-such as parity conversions and correlated diffusion of two distant vacancies-without losing its structural orders. The emergence of the collective motions is solely due to efficient thermal excitation of soft phonon modes at nanoscale. A series of spontaneous surface reconfigurations result in a mixture or effective flow of surface atoms as is random color shuffling of a Rubik's cube. This novel flexible solid state (termed as half-solidity) provides useful insights into understanding stability, flexibility, and functionality of nanosystems near or below melting temperatures.
Publisher
AMER CHEMICAL SOC
Issue Date
2010-02
Language
English
Article Type
Article
Keywords

MOLECULAR-DYNAMICS; ALUMINUM CLUSTERS; TRANSITION; UBIQUITIN; PROTEINS; SYSTEMS

Citation

ACS NANO, v.4, no.2, pp.1092 - 1098

ISSN
1936-0851
URI
http://hdl.handle.net/10203/97833
Appears in Collection
NT-Journal Papers(저널논문)
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