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Step-by-step cooling of a two-dimensional Na gas on the Si(111)-(7 X 7) surface
K. Wu H., A. Oreshkin I., Y. Takamura, Y. Fujikawa, T. Nagao, T. Briere, , Y. Kawazoe, R. Dou F., J. Jia F.Show More
Published in
Volume: 70
Issue: 19
Pages: 1 - 4
We report a temperature-dependent scanning tunneling microscopy study of Na adsorption on the Si(111)-(7 X 7) surface by cooling the surface from room temperature to 80 K. While at room temperature Na atoms can diffuse freely on the surface to form a two-dimensional gas, their motion is confined within the 7 X 7 half-unit cells at 160 K. With further cooling to 80 K, Na atoms become localized within individual "basins." The estimated diffusion barriers of Na atoms on the Si(111)-(7 X 7) surface and nature of interaction among them agree well with our theoretical predictions.
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