کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9812435 | 1518113 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Two-dimensional electronic structure and multiple excitonic states in layered oxychalcogenide semiconductors, LaCuOCh (Ch=S, Se, Te): Optical properties and relativistic ab initio study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Electronic structures of layered oxychalcogenides LaCuOCh (Ch=S, Se, Te) were studied using relativistic ab initio band calculations to understand their optical and electronic properties. Step-like structures terminated with one or two sharp peaks were observed in low-temperature (10 K) optical absorption spectra. Third optical nonlinearity measurements supported that the sharp peaks came from split excitonic levels. The ab initio calculations reproduced well these characteristic structures in the spectra and proved that the step-like optical absorption structures originated from two-dimensional nature of the electronic structures associated with the layered crystal structure of LaCuOCh. The split energies of the excitonic levels were quantitatively explained by spin-orbit interaction in the chalcogen ions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 486, Issues 1â2, 22 August 2005, Pages 98-103
Journal: Thin Solid Films - Volume 486, Issues 1â2, 22 August 2005, Pages 98-103
نویسندگان
Toshio Kamiya, Kazushige Ueda, Hidenori Hiramatsu, Hayato Kamioka, Hiromichi Ohta, Masahiro Hirano, Hideo Hosono,