کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5429024 1397330 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A first-principles molecular dynamics approach for predicting optical phonon lifetimes and far-infrared reflectance of polar materials
موضوعات مرتبط
مهندسی و علوم پایه شیمی طیف سنجی
پیش نمایش صفحه اول مقاله
A first-principles molecular dynamics approach for predicting optical phonon lifetimes and far-infrared reflectance of polar materials
چکیده انگلیسی

The Lorentz oscillator model is well-known for its effectiveness to describe the far-infrared optical properties of polar materials. The oscillator strength and damping factor in this model are usually obtained by fitting to experimental data. In this work, a method based on first-principles simulations is developed to parameterize the Lorentz oscillator model without any fitting parameters. The high frequency dielectric constant is obtained from density functional perturbation theory, while the optical phonon frequencies and damping factors are calculated using an analysis of ab initio molecular dynamics trajectories. This method is then used to predict the far-infrared properties of GaAs, and the results are in good agreement with experimental data.

► The relationship between the Lorentz oscillator model and the optical phonon properties is discussed. ► First-principles simulations are applied to parameterize the Lorentz model. ► The far-infrared reflectance of GaAs is predicted.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 113, Issue 13, September 2012, Pages 1683-1688
نویسندگان
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