Scanning tunneling microscopy (STM) images of a GaAs(110) surface with Ag clusters show that a Ga dangling bond state of this surface is occupied or unoccupied depending on the polarity of sample bias, in certain local regions of the surface. These results, which appear to be strange at first glance, can be interpreted by taking the electric field due to the STM tip into consideration. All other details of observed STM images can also be interpreted on the basis of this tip-induced field effect.
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Jiang et al. (1997) studied this question.
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