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Phys. Rev. B 70, 081313(R) (2004) [4 pages]

STM observation of Ga-dimers on a GaAs(001)-c(8×2)-Ga surface

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H. Xu, Y. Y. Sun, Y. G. Li, Y. P. Feng, A. T. S. Wee, and A. C. H. Huan*
Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore

Received 6 July 2004; published 31 August 2004

Using in situ scanning tunneling microscopy (STM) we have obtained high-resolution empty-state images exhibiting triple-protrusion rows on GaAs(001)-c(8×2)-Ga surface. We assign the middle protrusion rows to the surface Ga dimers in the ξ model proposed by Lee et al. Phys. Rev. Lett. 85 3890 (2000)]. The surface Ga dimers, which are responsible for the c(8×2) periodicity, are the key feature of the ξ structure and have never been imaged in previous STM studies. The current study provides direct evidence for the ξ model, while all other existing models can be readily excluded from our STM images.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.081313
DOI:
10.1103/PhysRevB.70.081313
PACS:
68.35.Bs, 71.55.Eq, 07.79.Cz, 73.20.At

*Email address: phyhuana@nus.edu.sg

 
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