Author/Authors :
Fukaya، نويسنده , , Y. and Matsuda، نويسنده , , I. and Hashimoto، نويسنده , , M. and Kubo، نويسنده , , K. and Hirahara، نويسنده , , T. and Yamazaki، نويسنده , , S. and Choi، نويسنده , , W.H. and Yeom، نويسنده , , H.W. and Hasegawa، نويسنده , , S. and Kawasuso، نويسنده , , A. and Ichimiya، نويسنده , , A.، نويسنده ,
Abstract :
The atomic structures of Au and Ag co-adsorption-induced √21 × √21 superstructure on a Si(111) surface, i.e., (Si(111)-√21 × √21-(Au, Ag)), where the Si(111)-5 × 2-Au surface is used as a substrate, have been investigated using reflection high-energy positron diffraction (RHEPD) and photoemission spectroscopy. From core-level spectra, we determined the chemical environments of Ag and Au atoms present in the Si(111)-√21 × √21-(Au, Ag) surface. From the rocking curve and pattern analyses of RHEPD, we found that the atomic coordinates of the Au and Ag atoms were approximately the same as those of the Au and Ag atoms in other Si(111)-√21 × √21 surfaces with different stoichiometries. On the basis of the core-level and RHEPD results, we revealed the atomic structure of the Si(111)-√21 × √21-(Au, Ag) surface.
Keywords :
Two-dimensional alloys , Silicon , Gold , silver , surface structure , Reflection high-energy positron diffraction (RHEPD) , Photoemission spectroscopy (PES)
