Regensburg 2007 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 10: Growth processes and surface properties

DY 10.3: Vortrag

Montag, 26. März 2007, 17:00–17:15, H5

Dynamics of steps on vicinal surfaces: Step-step interactions, sublimation and the Schwoebel effect — •Marian Ivanov, Vladislav Popkov, and Joachim Krug — Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str.77, D-50937 Köln

Using morphological instabilities one can produce templates for nanoscale technology. One example of such an instability is step bunching, which splits a regular vicinal surface into regions of low and high density of monoatomic steps. The dynamics of the surface is described by the Burton-Cabrera-Frank model with boundary conditions provided by mass conservation at the steps. The instability condition can be found by linear analysis of the equations. For the case of pure sublimation with step-step interactions and Schwoebel effect, a new term arises in comparison to earlier calculations. In the continuum limit this leads to a restriction for the maximum bunch slope and to novel scaling properties for sufficiently large bunches.