Direct measurement of diffusion by hot tunneling microscopy: Activation energy, anisotropy, and long jumps

Eric Ganz, Silva K. Theiss, Ing Shouh Hwang, Jene Golovchenko

Research output: Contribution to journalArticlepeer-review

196 Scopus citations

Abstract

We measure the activation energy for surface diffusion of isolated Pb adatoms on Ge(111) by observing individual atomic interchanges using a scanning tunneling microscope. The diffusion occurs mainly along one direction of the c(2×8) reconstructed surface with Pb adatoms moving between substitutional Ge adatom sites. Only half of the adatom interchanges are to near-neighbor sites, the rest are long jumps. The scanning process does not affect the diffusion. For temperatures from 24 to 79°C we find the diffusion obeys an Arrhenius law with an activation energy of 0.540.03 eV.

Original languageEnglish (US)
Pages (from-to)1567-1570
Number of pages4
JournalPhysical Review Letters
Volume68
Issue number10
DOIs
StatePublished - Jan 1 1992

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