Surface diffusion of Cr adatoms on Au(111) by quantum tunneling |
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Authors: | Ohresser P Bulou H Dhesi S S Boeglin C Lazarovits B Gaudry E Chado I Faerber J Scheurer F |
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Affiliation: | Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, UMR 130 CNRS-Université Paris Sud, 91898 Orsay, France. philippe.ohresser@synchrotron-soleil.fr |
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Abstract: | The low-temperature surface diffusion of isolated Cr adatoms on Au(111) has been determined using nonperturbing x rays. Changes in the x-ray magnetic circular dichroism spectral line shape together with Monte Carlo calculations demonstrate that adatom nucleation proceeds via quantum tunneling diffusion rather than over-barrier hopping for temperatures <40K. The jump rates are shown to be as much as 35 orders of magnitude higher than that expected for thermal over-barrier hopping at 10 K. |
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