Origin of the stability of Ge(105) on si: a new structure model and surface strain relaxation
Y Fujikawa1, K Akiyama, T Nagao
1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Abstract:
The structure of Ge(105)-(1 x 2) grown on Si(105) is examined by scanning tunneling microscopy (STM) and first-principles calculations. The morphology evolution with an increasing amount of Ge deposited documents the existence of a tensile surface strain in Si(105) and its relaxation with increasing coverage of Ge. A detailed analysis of high-resolution STM images and first-principles calculations produce a new stable model for the Ge(105)-(1 x 2) structure formed on the Si(105) surface that includes the existence of surface strain. It corrects the model developed from early observations of the facets of "hut" clusters grown on Si(001).
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