| Popis: |
There is controversy over the details of the reconstruction on Si(100), specifically whether the dimers are symmetric or asymmetric. We propose a Ginzberg-Landau model of the surface where the dimers are free to tilt. The model is consistent with recent calculations of the Si(100) surface structure, and explains the discrepancies between theory, scattering measurements, and STM observations. Two consequences of the model are a low-temperature phase transition from the p(2 × 1) to the p(2 × 2) or c(4 × 2) reconstructions, and the prediction that the electric fields of an STM can significantly change the behavior of the surface. We compare the model to STM observations. |
