Continuum theory of nanostructure decay via a microscale condition

Dionisios Margetis, Pak Wing Fok, Michael J. Aziz, Howard A. Stone

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The morphological relaxation of faceted crystal surfaces is studied via a continuum approach. Our formulation includes (i) an evolution equation for the surface slope that describes step line tension, g1, and step repulsion energy, g3; and (ii) a condition at the facet edge (a free boundary) that accounts for discrete effects via the collapse times, tn, of top steps. For initial cones and tn ≈ 4, we use t ∼ (g) from step simulations and predict self-similar slopes in agreement with simulations for any g=g3/g1>0. We show that for g « 1, (i) the theory simplifies to an equilibrium-thermodynamics model; (ii) the slope profiles reduce to a universal curve; and (iii) the facet radius scales as g-3/4.

Original languageEnglish (US)
Article number096102
JournalPhysical review letters
Volume97
Issue number9
DOIs
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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