Surface bands for single-domain 2 × 1 reconstructed Si(100) and Si(100):As. Photoemission results for off-axis crystals

Abstract

Single-domain Si(100) 2 \ifmmode\times\else\texttimes\fi{} 1 and Si(100):As 1 \ifmmode\times\else\texttimes\fi{} 2 surfaces have been obtained by using samples cut at 4\ifmmode^\circ\else\textdegree\fi{} from the (100) crystal axis with the tilt towards [011]. Low-energy electron diffraction results show that steps on the surface are predominantly two atomic layers high. The ordering on the terraces is good and has allowed us to obtain surface-state dispersions with angle-resolved photoemission for clean and As-terminated single-domain Si(100) 2 \ifmmode\times\else\texttimes\fi{} 1 surfaces.