Abstract
k-resolved inverse-photoemission spectroscopy has been used to determine the empty surface-state band structures of Si(111)..sqrt..3 x ..sqrt..3 -Al, -Ga, and -In surfaces. The results are compared with first-principles pseudopotential total-energy and electronic-structure calculations for energy-minimized geometries of the filled- (T/sub 4/) and the hollow- (H/sub 3/) site adatom models. Good agreement between experiment and theory for the unoccupied surface-state band structures is found for the T/sub 4/ model, which also has the lowest total energy.
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