کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5422148 | 1507904 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electronic and atomic structures of the Ag induced 3Ã3 superstructure on Ge(111)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electronic and atomic structures of the Ag induced 3Ã3 superstructure on Ge(111) Electronic and atomic structures of the Ag induced 3Ã3 superstructure on Ge(111)](/preview/png/5422148.png)
چکیده انگلیسی
The Ag/Ge(111) 3Ã3 surface together with Ag/Si(111) 3Ã3 constitutes a set of surfaces that is ideally suited for fundamental studies related to low dimensional physics. We here focus on the atomic and electronic structures of the two-dimensional 3Ã3 superstructure induced by Ag on Ge(111), a surface that is significantly less studied than the Si counterpart. Extensive information on the surface band structure obtained by angle resolved photoelectron spectroscopy (ARPES) is presented, complemented by atomic information from scanning tunneling microscopy (STM). The results reveal new findings that are important for the understanding of the Ag induced 3Ã3 structure, acting as a prototype for semiconductor/metal interfaces. i) We have identified a new occupied surface band near the M¯-point of the 3Ã3 surface Brillouin zone. ii) The Ag/Ge(111) 3Ã3 surface exhibits a partially occupied surface band, S1, with a parabolic-like shape at ί. At low temperature (LT) this band splits into two bands, S1U and S1D. The identification of two bands is significantly different from the case of Ag/Si(111) 3Ã3 for which just one band has been reported. Besides these specific results, our extensive ARPES study reveals four surface bands at room temperature (RT), while five surface bands were identified at â 100 K (LT). Room temperature empty state STM images show, depending on the tunneling bias, both honeycomb and hexagonal periodicities which are consistent with the honeycomb chained trimer and the in-equivalent trimer models, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 625, July 2014, Pages 23-29
Journal: Surface Science - Volume 625, July 2014, Pages 23-29
نویسندگان
Hafiz M. Sohail, R.I.G. Uhrberg,