کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9594941 | 1507978 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structure of double row quantum wires in Au/Si(5Â 5Â 3)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
We present a new structure for the quantum-wire surface Au/Si(5Â 5Â 3) obtained from three-dimensional X-ray diffraction measurements. We have found the structure has double row of gold, so the wires are two atoms thick. The diffraction pattern is 1Â ÃÂ 1 implying a simple (CTR-only) structure, but disorder is necessary in the model to get a good fit, in the form of a 50-50 splitting of the position of one of the gold sites. A 50% occupied Si adatom is also found, which is a common structural theme of Si(1Â 1Â 1) vicinal surfaces. Since there are insufficient available bonds for an adatom to reside in every unit cell, the Au splitting can be seen as a consequence of the alternating presence of the adatoms. No half order diffraction was observed, so any local order of these features must be assumed to be short-range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 581, Issues 2â3, 1 May 2005, Pages 199-206
Journal: Surface Science - Volume 581, Issues 2â3, 1 May 2005, Pages 199-206
نویسندگان
S.K. Ghose, I.K. Robinson, P.A. Bennett, F.J. Himpsel,