Scanning tunneling spectroscopy and density functional calculation of silicon dangling bonds on the Si(100)-2 × 1:H surface

► Studied local effects of Si dangling bonds using UHV-STM. ► Lateral decay of the DB state is anisotropic on the Si(100) surface. ► Interactions between DBs within a DB wire lead to increased decay length. ► Interactions between adjacent DBs are also investigated. ► Experiment results strongly supported by SIESTA calculation