Nonclassical “Explosive” Nucleation in Pb/Si(111) at Low Temperatures | Zendy

Matthew Hershberger | Zendy; M. Hupalo | Zendy; P. A. Thiel | Zendy; C. Z. Wang | Zendy; K. M. Ho | Zendy; Michael C. Tringides | Zendy

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Nonclassical “Explosive” Nucleation in Pb/Si(111) at Low Temperatures

Author(s) -

Matthew Hershberger,

M. Hupalo,

P. A. Thiel,

C. Z. Wang,

K. M. Ho,

Michael C. Tringides

Publication year - 2014

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.113.236101

Subject(s) - nucleation , mesoscopic physics , wetting layer , wetting , chemical physics , materials science , cluster (spacecraft) , explosive material , condensed matter physics , layer (electronics) , phase (matter) , molecular physics , nanotechnology , thermodynamics , physics , chemistry , composite material , organic chemistry , quantum mechanics , computer science , programming language

Classically, the onset of nucleation is defined in terms of a critical cluster of the condensed phase, which forms from the gradual aggregation of randomly diffusing adatoms. Experiments in Pb/Si(111) at low temperature have discovered a dramatically different type of nucleation, with perfect crystalline islands emerging "explosively" out of the compressed wetting layer after a critical coverage Θ_{c}=1.22 ML is reached. The unexpectedly high island growth rates, the directional correlations in the growth of neighboring islands and the persistence in time of where mass is added in individual islands, suggest that nucleation is a result of the highly coherent motion of the wetting layer, over mesoscopic distances.

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