Abstract
We have investigated the atomic structure and electronic states of the $\mathrm{Si}(111)\ensuremath{-}(4\ifmmode\times\else\texttimes\fi{}1)\mathrm{In}$ surface using the first-principles total energy calculations. The atomic coordinates optimized for this surface are in excellent agreement with those obtained from the recent x-ray diffraction experiment [Bunk et al., Phys. Rev. B 59, 12 228 (1999)]. The calculated surface electronic structure, which is anisotropic, provides a satisfactory description of angle-resolved photoemission data. These calculations provide strong support for the model proposed by Bunk et al.
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