کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9567164 1503710 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electron-hole relaxation through optical-phonon emission in CdTe/ZnTe quantum dots
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Electron-hole relaxation through optical-phonon emission in CdTe/ZnTe quantum dots
چکیده انگلیسی
We present a study of ZnCdTe quantum dots (QDs) embedded in Zn-rich ZnCdTe quantum wells (QWs). The Cd-rich ZnCdTe islands are confined along the growth direction by pure ZnTe barriers and laterally by Zn-rich ZnCdTe QWs. Using a time-resolved pump and probe technique, we analyse the phonon emission-cascade in QWs governing, after non-resonant optical excitation in the QWs, the energy relaxation of electron-hole pairs towards self-organized QDs. Since electron-hole pairs thermalize only by emission of an integer number of longitudinal-optical phonons, at the end of the cascade, the QDs become selectively populated. We thus determine the mean value of the optical-phonon emission time. Then, for longer time delays, we observe the population relaxation dynamics of the selected quantum dots.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 247, Issues 1–4, 15 July 2005, Pages 556-560
نویسندگان
, , , , , ,