کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1783821 1524079 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A series of phonon-polaritons in a diatomic ionic crystal
ترجمه فارسی عنوان
مجموعه ای از قطب های فونون-پلاریون در یک کریستال یونی دیاتومیک
کلمات کلیدی
کریستال یونی، میدان الکترومغناطیسی، فونون-پلاریتون موج بلند، زمینه محلی، اپراتور آماری، حرکت حرارتی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک اتمی و مولکولی و اپتیک
چکیده انگلیسی


• The Hamiltonian of a diatomic ionic crystal in the Kun Huang model is proposed.
• The local field is taken into account by introducing of an effective charge.
• A perturbation theory in the introduced self-consistently small interaction is build.
• A statistical operator for the electromagnetic field in ionic crystal is constructed.
• The new series of long-wave upper phonon-polaritons is obtained.

The interaction between the harmonics of the optical phonon and the transverse wave of the electromagnetic field in ionic crystals with two atoms in the unit cell is considered. The Kun Huang model is used to describe the point charges sublattices that oscillate with a frequency ω0ω0. The thermal motion of charges sublattices surrounding thermostat is taken into account. The local field is taken into account as well by introducing of an effective charge. A statistical operator of the system in a perturbation theory is introduced self-consistently small interaction is constructed. The new series of long-wave phonon-polaritons as the eigenwaves of the transverse electromagnetic field is obtained. The approximation is valid for a small ratio of the standard thermal deviation to the wavelength that allows to limit only the second and the third phonon harmonics in the dispersion equation at plotting the graph. A frequency line 2ω02ω0 restricts the top of the first upper phonon-polariton graph and the bottom of the second upper phonon-polariton graph for the used example of cesium bromide crystal. The rest of the phonon-polaritons have graphs in the form of stairs with a slope, asymptotically approaching to the photon graph in this crystal, and with a height ω0ω0.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chinese Journal of Physics - Volume 54, Issue 2, April 2016, Pages 269–277
نویسندگان
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