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Research Activities > Programs > Nonequilibrium Interface and Surface Dynamics 2007

Relaxation of Nanoscale Structures on SrTiO3(001) Surfaces

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Relaxation of Nanoscale Structures on SrTiO3(001) Surfaces

Professor Koichi Sudoh

Osaka University

Abstract:   Real time observation of the relaxation of nanoscale structures by scanning tunneling microscopy provides significant information required to develop a quantitative model of morphological relaxation. We have examined the relaxation of various well-defined nanoscale structures created by a STM nanofabrication process on SrTiO3(001) surfaces. Examples to be presented include the observation of straightening of a curved step, decay of a two-dimensional hole, and decay of a multilayer hole. The observed evolution of isolated structures can be interpreted in terms of the diffusion limited kinetics. It is also found that the relaxation is affected by the surrounding surface structure such as the substrate step, which perturbs the diffusion field. For the relaxation of multilayer structures, more complex behavior due to the short range attractive step-step interaction has been observed.

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