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(Color online) (a) LEED mesh of clean Ge(001) surface. (b) Model of accepted termination of Ge(001) surface. Top left: side view of unreconstructed surface. Top right: the energy lowering dimer formation that gives the symmetry. The two dimers shown are buckled in either equivalent position. Bottom: top down view of the surface.
(Color online) (a) empty state STM image of Ge(001) surface following deposition of ML Fe. (b) STM zoom in, showing the dots, elongated across the dimer rows, rotate from one terrace to the next. (c) STM image. The dashed lines along are separated by . These lines always pass through the center of the dots, illustrating the definite registry of the dots with the substrate. The loss of long range symmetry, characteristic of clean Ge(001), is also evident from this image. (d) Model of registry of the Fe dots on the Ge(001) surface. As a result of the observed spacing, it can be concluded that all dots nucleate at equivalent positions, as shown here. (e) Side view of dots with respect to the surface.
(Color online) (a) tunneling spectra over Fe dots (thick solid) and surrounding Ge (001) substrate (thin circles). Marked current rectification due to the dots is evident. (b) Derivative of spectra. Dots have band gap , and surrounding substrate . [(c)–(f)] map obtained over a single Fe dot. Current rectification is well confined to area over the dot. No change in tunneling behavior of surrounding substrate observed.
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