4_07/2008Cover Picture: Small 7/2008

The cover picture shows Ga nanoclusters in a well-ordered, self-assembled array on the Si(111) − 7 × 7 surface. Ultrahigh vacuum scanning tunneling microscopy was used to simultaneously image the topography and the local density of states (LDOS) of this system. The image is a 10 nm × 10 nm region with the LDOS plotted as a color map over the topography. The results indicate that the electronic charge on the surface has redistributed due to the presence of the Ga nanocluster array and that the nanoclusters are connected in a two-dimensional network of higher differential tunneling conductance. For more information, please read the Communication “Atomically Resolved Charge Redistribution for Ga Nanocluster Arrays on the Si(111)-7 × 7 Surface” by M. Hersam et al, beginning on page 915.

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