Electric field effects on surface dynamics: Si ad-dimer diffusion and rotation on Si(001)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Surface and Interface Science Dept.
- Los Alamos Research Park, Los Alamos, NM (United States). Motorola Labs.
Density functional calculations show that the electric field effect on Si ad-dimer diffusion on Si(0 0 1) is largely a reflection of the position dependence of the ad-dimer’s dipole moment. We can use surface diffusion barriers’ dependence on perpendicular electric fields to discriminate between diffusion mechanisms. Since the previously accepted mechanism for ad-dimer diffusion on Si(0 0 1) has the opposite field dependence to what is observed, it cannot be the one that dominates mass-transport. Here, we identify an alternate process, with a similar barrier at zero electric field and field dependence in agreement with measurements. For rotation, calculations to date show linear field dependence, in contrast to experiments.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 889405
- Report Number(s):
- SAND2003--0048J
- Journal Information:
- Surface Science, Journal Name: Surface Science Journal Issue: 1-3 Vol. 536; ISSN 0039-6028
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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