2-DIMENSIONAL ELECTRON-GAS AT INAS(100)1X2 1X4PB/

Upon deposition of one lead monolayer on the clean, In-terminated InAs (100)4 x 2/c(8 x 2) surface, we have obtained a new 1 x 2/1 x 4 supers tructure and have studied its electronic properties by synchrotron rad iation photoelectron spectroscopy (valence bands and In 4d plus Pb 5d core levels). The markedly increased emission in the vicinity of the F ermi level for this reconstruction, as compared to the bare surface, a nd its narrow localization in k space are the signature of the formati on of a strong two-dimensional electron gas in the sub-surface region. (C) 1998 Elsevier Science B.V. All rights reserved.