Spiral Growth and Step Edge Barriers

Alex Redinger, Oliver Ricken, Philipp Kuhn, Andreas Rätz, Axel Voigt, Joachim Krug, and Thomas Michely

Phys. Rev. Lett. 100, 035506 – Published 24 January 2008

Abstract

The growth of spiral mounds containing a screw dislocation is compared to the growth of wedding cakes by two-dimensional nucleation. Using phase field simulations and homoepitaxial growth experiments on the Pt(111) surface we show that both structures attain the same large scale shape when a significant step-edge barrier suppresses interlayer transport. The higher vertical growth rate of the spiral mounds on Pt(111) reflects the different incorporation mechanisms for atoms in the top region and can be formally represented by an enhanced apparent step-edge barrier.

Received 6 September 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.035506

Authors & Affiliations

Alex Redinger^1,2, Oliver Ricken¹, Philipp Kuhn³, Andreas Rätz⁴, Axel Voigt⁴, Joachim Krug³, and Thomas Michely¹

¹II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Zülpicher Strasse 77, Germany
²I. Physikalisches Institut, RWTH Aachen, 52056 Aachen, Germany
³Institut für Theoretische Physik, Universität zu Köln, 50937 Köln, Zülpicher Strasse 77, Germany
⁴Institut für Wissenschaftliches Rechnen, Technische Universität Dresden, Zellescher Weg 12–14, 01062 Dresden, Germany

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Issue

Vol. 100, Iss. 3 — 25 January 2008

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