Corner hole adatom stacking fault structure of Bi on Au(111)

Abstract

The surface atomic Structure of Bi oil Au(111) is Studied with scanning tunneling microscopy. At about 0.5 monolayer of Bi, a well-ordered 6 x 6 atomic structure is observed. The structure has three notable features: corner holes, Bi adatoms, and stacking faults, very similar to a semiconductor surface of Si(111)-7 x 7. Out of IS Bi Surface atoms in a unit cell, six atoms are at hollow sites and are adatoms, and another six atoms are near-bridge sites. The last six atoms surround corner holes and are lower than other Surface atoms by about 0.2 angstrom. A possible atomic model is proposed based oil our observation. (C) 2008 Elsevier B.V. All rights reserved.