About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Paper
Surface structural transition of Si(111)2 × 1 induced by sodium
Abstract
We have investigated sodium deposition on the cleaved Si(111)2 × 1 surface employing k-resolved direct and inverse photoemission, low-energy electron diffraction (LEED) and work-function measurements. We find that Na lifts the 2 × 1 reconstruction yielding a 1 × 1 LEED pattern. This is in contrast to K which leaves the 2 × 1 surface intact, and Cs which transforms it into a √3 × √3 R30° overlayer structure. The Na-induced empty and occupied surface states reveal the surface to be semiconducting as in the Cs case, but in contrast to K which forms a metallic interface system. Hence, the alkali metals do not behave similarly or iso-electronically in their bonding to the cleaved Si(111) surface, which points to the importance of their differing atomic radii and/or polarizabilities. © 1992.