Europhys. Lett.
Volume 64, Number 3, November 2003
Page(s) 392 - 398
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 November 2003
DOI: 10.1209/epl/i2003-00216-4
Europhys. Lett., 64 (3) , pp. 392-398 (2003)

Monitoring the local atomic structure by surface states spectroscopy

A. 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 $\chem{Ag/Cu(111)}$ 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 $\chem{Cu}$ 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