Atom and Electron Dynamics at Surfaces and Effect on Growth of Nanostructures

概要

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The dynamics of surface atoms becomes an important issue when the size of material structures is reduced to the nanometer scale. Additionally, quantum effects start to dominate both their properties and their growth behavior at low temperature. Using field ion microscopy (FIM) and scanning tunneling microscopy (STM), we directly observe the atoms, molecules, clusters and electron dynamics on nano surfaces. We focus mostly on studying how the atom and electron dynamics affect the dynamics as well as the growth behavior of nano-islands and clusters on silicon and metal surfaces. Here I summarize our study of the diffusion behavior of H, O2, O and Si magic clusters on the Si(111)-$7\times 7$ surface, and also how using the chemical gradient induced surface diffusion of surface atoms, one can create a chemically inert and thermally stable single atom sharp pyramidal tip. In addition, we observe that the low temperature growth of Pb nano islands on the Si(111)-$7\times 7$ surface is affected by the electronic standing wave states in the normal direction of these islands.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-07-15