Europhys. Lett., 64 (3) , pp. 392-398 (2003)
Monitoring the local atomic structure by surface states spectroscopyA. Bendounan, H. Cercellier, B. Kierren, Y. Fagot-Revurat, V. Yu. Yurov and D. Malterre
Laboratoire de Physique des Matériaux, Université Henri Poincaré, Nancy I B.P. 239, F-54506 Vandoeuvre-lès-Nancy, France
(Received 10 April 2003; accepted in final form 22 August 2003)
Combined high-resolution ARPES with STM measurements are presented to investigate the interface. In the submonolayer range, the irreversible moiré to triangular structural transformation is revealed by the change of the surface state energy. A transient state, seen in our ARPES measurements, is connected to a nanoscopic pre-formed triangular area evidenced by STM. In addition, a careful analysis of the annealing effect on a 1.6 monolayer film suggests that the presence of the second layer limits the entrance of vacancies in the topmost layer and prevents the formation of the triangular dislocation loop pattern. These results emphasize how to use surface states as a sensitive probe of surface and interface reconstructions from their spectroscopic signature.
73.20.At - Surface states, band structure, electron density of states.
79.60.-i - Photoemission and photoelectron spectra.
68.37.Ef - Scanning tunneling microscopy (including chemistry induced with STM).
© EDP Sciences 2003