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Frank's prediction of the spiral growth mode in 1949 defined a pivotal momentin the history of crystal growth. In recent decades the topic has received lessattention, and instead we have seen a resurrection of two-dimensionalnucleation theory in the context of growth experiments on defect-freehomoepitaxial thin films. In particular, the key role of interlayer transportcontrolled by step edge barriers of the Ehrlich-Schwoebel type in shaping themorphology of multilayer films has been increasingly recognized. After a briefreview of the classical theory, this paper reports on a recent study of spiralgrowth in the presence of step edge barriers. Our key observation is that stepedge barriers lead to unconventionally shaped spiral hillocks that display thesame characteristic ever-steepening height profiles as wedding cakes formedduring growth by two-dimensional nucleation. This prediction was verifiedexperimentally by inducing screw dislocations through ion bombardment of thePt(111) surface, thus creating a homoepitaxial growth system on which spiralhillocks and wedding cakes coexist.

Spiral growth, two-dimensional nucleation, and the Ehrlich-Schwoebel effect