Local modification of the surface state properties at dilute coverages: CO/Cu(111)

Zaum, C. and Meyer-Auf-Der-Heide, K.M. and Morgenstern, K.

Volume: 97 Pages:
DOI: 10.1103/PhysRevB.97.155437
Published: 2018

We follow the diffusion of CO molecules on Cu(111) by time-lapsed low-temperature scanning tunneling microscopy. The diffusivity of individual CO molecules oscillates with the distance to its nearest neighbor due to the long-range interaction mediated by the surface state electrons. The markedly different wavelengths of the oscillation at a coverage of 0.6% ML as compared to the one at 6% ML coverage correspond to two different wavelengths of the surface state electrons, consistent with a shift of the surface state by 340 meV. This surprisingly large shift as compared to results of averaging methods suggests a local modification of the surface state properties. © 2018 American Physical Society.

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