Angle-resolved-photoemission study of the electronic structure of the Si(001)<i>c</i>(4×2) surface

Abstract

A wide-terrace single-domain Si(001)c(4\ifmmode\times\else\texttimes\fi{}2) surface has been obtained by cooling a wide-terrace single-domain Si(001)2\ifmmode\times\else\texttimes\fi{}1 surface to 200--80 K. Angle-resolved ultraviolet photoelectron spectra have been measured for the Si(001)c(4\ifmmode\times\else\texttimes\fi{}2) surface at 200--100 K and compared with those for the Si(001)2\ifmmode\times\else\texttimes\fi{}1 surface. The electronic structure of the Si(001)c(4\ifmmode\times\else\texttimes\fi{}2) surface appears to be explained as that expected for ``antiferromagnetic'' order of asymmetric dimers of surface Si. The electronic structure of the Si(001)2\ifmmode\times\else\texttimes\fi{}1 surface appears to be reminiscent of the c(4\ifmmode\times\else\texttimes\fi{}2) surface.