The effect of the STM tip on Si(100) reconstructed surfaces
We present a theoretical study of the effects of the STM tip on the geometry of Si(100) reconstructed surfaces. The energy barrier to switching between different reconstructions is also discussed. We use a molecular dynamics method and self-consistent forces to simulate the time-dependent behaviour...
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| Other Authors: | , |
| Format: | article |
| Language: | eng |
| Published: |
1993
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| Subjects: | |
| Online Access: | http://hdl.handle.net/1822/3435 |
| Country: | Portugal |
| Oai: | oai:repositorium.sdum.uminho.pt:1822/3435 |
| Summary: | We present a theoretical study of the effects of the STM tip on the geometry of Si(100) reconstructed surfaces. The energy barrier to switching between different reconstructions is also discussed. We use a molecular dynamics method and self-consistent forces to simulate the time-dependent behaviour of the surface atoms. The molecular orbital calculations are performed at the CNDO level using a cluster model. Our results indicate significant differences for positively and negatively biased tips. The thermally induced rocking of surface dimers is inhibited by the application of a positive bias to the tip and it is promoted by a negative bias. These bias-dependent effects may offer a plausible explanation for the bias dependence of STM images of this surface. |
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