Coverage-dependent faceting of Au chains on Si(557)

被引：59
作者：
Barke, I. [1 ,2 ]
Zheng, F. [2 ]
Bockenhauer, S. [2 ]
Sell, K. [1 ]
v. Oeynhausen, V. [1 ]
Meiwes-Broer, K. H. [1 ]
Erwin, S. C. [3 ]
Himpsel, F. J. [2 ]
机构：
[1] Univ Rostock, Inst Phys, D-18051 Rostock, Germany
[2] Univ Wisconsin Madison, Dept Phys, Madison, WI 53706 USA
[3] USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 15期
关键词：
elemental semiconductors; gold; phase diagrams; photoelectron spectra; scanning tunnelling microscopy; semiconductor-metal boundaries; silicon; surface reconstruction; ELECTRON-MICROSCOPY; ATOMIC-STRUCTURE; GOLD; SURFACE; SPIN;
D O I：
10.1103/PhysRevB.79.155301
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structural and electronic phase diagrams of Au on Si(557) are established using scanning tunneling microscopy (STM) and angle-resolved photoemission. Five phases consisting of altogether seven facets are observed in the submonolayer regime. With increasing Au coverage one observes Si(111)7x7+Si(112), Si(557)-Au, Si(111)5x2-Au+Si(335)-Au, Si(111)root 3x root 3-Au+Si(335)-Au, and Si(111)root 3x root 3 root-Au+Si(5 5 11)-Au. The relative surface areas of the five phases and seven facets are determined accurately by depositing a Au wedge ranging from 0 to 0.7 monolayer and performing automatic pattern recognition on large-scale STM images. Angle-resolved photoemission spectra are decomposed into contributions from the five phases. The Fermi wave vectors and the band filling of various facets are identified. Using Si(557)-Au as reference we find a coverage of three Au chains per unit cell for the frequently studied Si(111)5x2-Au surface (instead of the widely used value of two Au chains). Likewise a coverage of two Au chains per unit cell is found for Si(553)-Au (instead of one Au chain), in agreement with x-ray diffraction. A structural model with three Au rows per unit cell is developed for Si(111)5x2-Au using density-functional-theory calculations.
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页数：9
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