کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5404206 | 1505932 | 2006 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Femtosecond pump-probe study of coherent soft phonon in Pb1âxGexTe ferroelectrics
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Under the high-density photoexcitation by ultrashort laser pulses, strong coupling between photogenerated carriers and phonons as well as anharmonic phonon-phonon coupling may cause structural phase transition in ferroelectric materials. In the present paper, we report on the ultrafast dynamics of the soft mode (A1 symmetry) in ferroelectric semiconductor Pb1âxGexTe (x=0.07) under the high-density photoexcitation. With the increase of the pump fluence, the coherent A1 phonon in Pb1âxGexTe exhibits linear increase in the amplitude and the softening of the frequency, the latter of which is explained by carrier-phonon interaction. The damping rate also gradually increases with the pump fluence, which is due to the anharmonic phonon-phonon coupling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volumes 119â120, JulyâOctober 2006, Pages 378-382
Journal: Journal of Luminescence - Volumes 119â120, JulyâOctober 2006, Pages 378-382
نویسندگان
Rong Lu, Muneaki Hase, Masahiro Kitajima, Shinichi Nakashima, Shunji Sugai,