Diffusion mechanisms and the nature of Si ad-dimers on Ge(001)

Zoethout, E. and Zandvliet, H.J.W. and Wulfhekel, W. and Rosenfeld, Georg and Poelsema, Bene (1998) Diffusion mechanisms and the nature of Si ad-dimers on Ge(001). Physical Review B: Condensed matter and materials physics, 58 (24). p. 16167. ISSN 1098-0121

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Abstract:	The thermal motion of Si ad-dimers on Ge(001) has been studied with scanning tunneling microscopy. At room temperature the Si ad-dimers residing on top of the substrate dimer rows perform a one-dimensional random walk along the substrate dimer rows. The activation barrier for the diffusion process is estimated to be 0.83 eV. Although the preferential diffusion direction is along the substrate dimer rows, also diffusion across the rows has been observed. The latter diffusion process consists of two separate events: a jump of a Si ad-dimer from an on-top position to a position in the trough between the substrate dimer rows and a hop from a trough position to an on-top position.
Item Type:	Article
Copyright:	© 1998 The American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Interfaces and Nanomaterials (PIN)
Link to this item:	http://purl.utwente.nl/publications/73147
Official URL:	http://dx.doi.org/10.1103/PhysRevB.58.16167
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