Dispersion of the S' 1 state of the √3 structure on (a) the Si(111) surface, (b) θ S = 1.0 BL, (c) θ S = 2.0 BL, and (d) θ S = 3.0 BL of the strained Si/Ge(111). Values of k F and m* are (a) 1.090 ± 0.005 Å−1, 0.21 ± 0.02 m e, (b) 1.071 ± 0.005 Å−1, 0.28 ± 0.02 m e, (c) 1.066 ± 0.005 Å−1, 0.20 ± 0.02 m e, and (d) 1.059 ± 0.005 Å−1, 0.22 ± 0.02 m e, respectively, where m e is the free electron mass. Filled squares show the peak positions of the S' 1 state estimated from peak fitting of the ARPES curves.
Relationship between mean atomic spacing and Si thickness, θ S. The dotted line indicates the atomic spacing of the √3 × √3-Ag structure on Si(111).
Relationship between strain and m* for the surface metallic band in the √3 × √3-Ag structure on Si/Ge(111).
Ge-3d core level photoelectron spectra from the surface of the Si film on Ge(111), at (a) θ S = 0 BL, (b) θ S = 1.5 BL, (c) θ S = 2.5 BL, and (d) θ S = 5.0 BL. Spectral contributions are resolved using four different spin-orbit doublets, and are components of bulk (B) and surface atoms bound to adatoms (S 1), rest atom (S 2), and adatom (S 3).
Dependence of surface component thickness in Ge-3d states (open squares) and Si-2p states (solid circles).
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