By Ingalis A.G. (ed.)
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1. ¢,». ». ,. _. ~. I . *. ~. - . i;--;- * i -. ~ . ~ '-. ,_ _ , ,4 ¢ V gn. ~-i-~.. ;,-,~,-1. ». l K - . ~. u-; -, U~ -r~ -_- . 4‘ <‘~.. ¢;. ,-_.. -.. 1: A ~ X= '», . H -_--,-‘,4, .. PU ,'~~r 4 . '-"I-2+‘: I". ’~ . -‘ Plate 10. Large-scale image of the Ge(111) surface. The Ge sample was cleaved in ultra—high vacuum, and annealed at about 400°C. On most of the areas of the surface, a c(2 >< 8) reconstruction is observed. Because the nascent Ge(111) surface has a three-fold symmetry and the c(2 >< 8) reconstruction has two-fold symmetry, there are three equivalent orientations.
I . *. ~. - . i;--;- * i -. ~ . ~ '-. ,_ _ , ,4 ¢ V gn. ~-i-~.. ;,-,~,-1. ». l K - . ~. u-; -, U~ -r~ -_- . 4‘ <‘~.. ¢;. ,-_.. -.. 1: A ~ X= '», . H -_--,-‘,4, .. PU ,'~~r 4 . '-"I-2+‘: I". ’~ . -‘ Plate 10. Large-scale image of the Ge(111) surface. The Ge sample was cleaved in ultra—high vacuum, and annealed at about 400°C. On most of the areas of the surface, a c(2 >< 8) reconstruction is observed. Because the nascent Ge(111) surface has a three-fold symmetry and the c(2 >< 8) reconstruction has two-fold symmetry, there are three equivalent orientations.
The gray-scale images show the spatial variation of the dI/dV signal (as a measure of the local density of states) recorded at the respective biases at which peaks are observed in the dI/dV spectra. Rows from top to bottom correspond to chains of three to nine atoms while columns include states of order n (n: number of lobes of the squared wavefunction). The data reveal the on-chain localization of the quantum states which arise from interatomic coupling and provide a clear-cut example of quasi-one-dimensional con nement in an atomic-scale nanostructure.