1. Bi- and Au-Induced Reconstructions on GaAs(001)-2 ×4 Surface
- Author
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Qi-Kun Xue, Jiang Ying, Tang Zhe, Wu Ke-Hui, Wang Wen-Xin, Yang Shen-Yuan, Jia Jin-Feng, and Wang En-Ge
- Subjects
Diffraction ,Materials science ,Low-energy electron diffraction ,Scattering ,General Physics and Astronomy ,Nanotechnology ,Molecular physics ,law.invention ,Electron diffraction ,law ,Microscopy ,Scanning tunneling microscope ,Electron counting ,Quantum tunnelling - Abstract
Submonolayer Bi and Au adsorptions on the GaAs(001)-2 × 4 surface are investigated by scanning tunnelling microscopy, low energy electron diffraction and first-principles calculations. The 1 × 4 and 3 × 4 reconstructed surface induced by Bi and Au, respectively, are revealed and their structural models are proposed based on experiments and first-principles calculations. Moreover, the validity of the recently proposed generalized electron counting (GEC) model [Phys. Rev. Lett. 97 (2006) 126103] is examined in detail by using the two surfaces. The GEC model perfectly explains the structural features, such as the characteristic short double-line structure in the Bi-1 × 4 surface and the 3× arrangement of four-atom Au clusters.
- Published
- 2008