Nonclassical “Explosive” nucleation in Pb/Si(111) at low temperatures

Hershberger, M. T.; Hupalo, M.; Thiel, P. A.; Wang, C. Z.; Ho, K. M.; Tringides, M. C.

doi:10.1103/PhysRevLett.113.236101

Nonclassical “Explosive” nucleation in Pb/Si(111) at low temperatures

Journal Article · Tue Dec 02 23:00:00 EST 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.113.236101· OSTI ID:1227148

Hershberger, M. T. ^[1]; Hupalo, M. ^[1]; Thiel, P. A. ^[1]; Wang, C. Z. ^[1]; Ho, K. M. ^[1]; Tringides, M. C. ^[1]

Iowa State Univ., Ames, IA (United States)

In this study, 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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1227148

Alternate ID(s):: OSTI ID: 1180430

Report Number(s):: IS-J--8747

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 113; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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