کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7939360 | 1513188 | 2018 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polaron and dielectric mismatch effects on impurity-related optical absorption and refractive index changes in a spherical quantum dot
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The influence of both dielectric mismatch and electron-phonon interaction (EPI) effects on the linear and nonlinear optical properties of spherical quantum dots (QDs) with a shallow hydrogenic impurity under electric field are studied. The interplay among confinement geometry, dielectric mismatch, electron-phonon interaction, and the Stark effect on the oscillator strengths, absorption coefficients (ACs) and refractive index changes (RICs) has been revealed. The results show that the polaron effect and/or image charges lead to the blue shifts of absorption coefficients and refractive index changes. As a result of a quantum confinement Stark effect the red shifts of optical characteristics with increasing electric field have been observed. This indicates that the impurity-related optical characteristics of quantum dots can be controlled by the Stark confinement.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 113, January 2018, Pages 442-458
Journal: Superlattices and Microstructures - Volume 113, January 2018, Pages 442-458
نویسندگان
A.L. Vartanian, A.L. Asatryan, L.A. Vardanyan,