Atomic structure of two-dimensional binary surface alloys: Si(111)-√21 x √21 superstructure

被引：7

作者：

Fukaya, Y. ^{[1
]}

Matsuda, I. ^{[2
]}

Hashimoto, M. ^{[1
]}

Kubo, K. ^{[3
]}

Hirahara, T. ^{[3
]}

Yamazaki, S. ^{[3
]}

Choi, W. H. ^{[4
,5
]}

Yeom, H. W. ^{[4
,5
]}

Hasegawa, S. ^{[3
]}

Kawasuso, A. ^{[1
]}

Ichimiya, A. ^{[1
]}

机构：

[1] Japan Atom Energy Agcy, Adv Sci Res Ctr, Takasaki, Gunma 3701292, Japan

[2] Univ Tokyo, ISSP, Kashiwa, Chiba 2778581, Japan

[3] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[4] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea

[5] Pohang Univ Sci & Technol, Ctr Atom Wires & Layers, Pohang 790784, South Korea

来源：

SURFACE SCIENCE | 2012年 / 606卷 / 11-12期

关键词：

Two-dimensional alloys; Silicon; Gold; Silver; Surface structure; Reflection high-energy positron diffraction (RHEPD); Photoemission spectroscopy (PES); ENERGY POSITRON DIFFRACTION; HUME-ROTHERY PHASES; ELECTRONIC-STRUCTURE; ROOT-3-AG SURFACE; SILICON; BEAM; AU; CRYSTALS;

D O I：

10.1016/j.susc.2012.02.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The atomic structures of Au and Ag co-adsorption-induced root 21 x root 21 superstructure on a Si(111) surface. i.e., (Si(111)-root 21 x root 21-(Au, Ag)), where the Si(111)-5 x 2-Au surface is used as a substrate, have been investigated using reflection high-energy positron diffraction (RHEPD) and photoemission spectroscopy. From core-level spectra, we determined the chemical environments of Ag and Au atoms present in the Si(111)-root 21 x root 21-(Au, Ag) surface. From the rocking curve and pattern analyses of RHEPD, we found that the atomic coordinates of the Au and Ag atoms were approximately the same as those of the Au and Ag atoms in other Si(111)-root 21 x root 21 surfaces with different stoichiometries. On the basis of the core-level and RHEPD results, we revealed the atomic structure of the Si(111)-root 21 x root 21-(Au, Ag) surface. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：919 / 923

页数：5

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