Fig. 1: Si(111)-7×7 surface with Ag atoms.
From: Periodic corner holes on the Si(111)-7×7 surface can trap silver atoms
(a) Filled states STM image of the Si(111)-7×7 surface with Ag atoms obtained at -1.8 V, and 177 nA (size 50 × 50 nm2). The basic unit cell is denoted in the image with the diamond shape outline. The Ag atoms in the corner holes (CHs) are pointed with the arrows and can be recognized with the surrounding six top adatoms that belong to six adjacent unit cells and those adatoms look brighter than those around the empty corner holes. The inset in the right top side clearly shows CH with Ag atom denoted with the circle and arrow and also Ag inside FHUC outlined with the triangle. (b) High-resolution scanning tunneling microscope (STM) image (filled states, −2.0 V, 153 nA, 12 × 12 nm2) with two corner holes denoted by the arrows, one pointing to the corner hole with 1 Ag atom and another pointing to the corner hole without Ag atom. Original files in (a) and (b) are provided in Supplementary Data 2: m17_ori.par, m17_ori.tf0, m17_ori.tb0.
