نوع مقاله : مقاله پژوهشی
نویسندگان
گروه فیریک، دانشکده‌ی علوم پایه، دانشگاه بین‌المللی امام خمینی (ره)، قزوین ـ ایران
چکیده
در این مقاله، به شیوهای تحلیلی چگونگی برانگیزش چگالی جریان‌های غیرخطی و موج‌های هلیکون ناشی از برهم‌کنش پرتوهای الکترومغناطیسی پمپ شده به یک پلاسمای کوانتومی نیم‌رسانا مورد بررسی قرار می‌گیرد. بدین منظور، مدل سیالی تعمیم‌یافته‌ای برای به دست آوردن پاسخ غیرخطی الکترون‌های محیط در حضور میدان مغناطیسی خارجی به کار گرفته می‌شود. نشان داده می‌شود که در نتیجه‌ی برهم‌کنش دو موج الکترومغناطیس، یک نیروی پاندرماتیو در محیط نیم‌رسانا ایجاد شده و باعث برانگیزش یک موج هلیکون می‌شود. علاوه براین، چگالی توان موج هلیکون برانگیخته شده محاسبه شده و نسبت به پارامترهای مختلف محیط پلاسمای حالت جامد مورد ارزیابی قرار می‌گیرد. هم‌چنین با تحلیل نموداری نشان داده می‌شود که چگالی توان موج برانگیخته با افزایش میدان مغناطیسی خارجی و چگالی تعادلی الکترون‌ها افزایش و با افزایش بسامد برخورد الکترون- فونون کاهش می‌یابد.
تازه های تحقیق
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کلیدواژه‌ها
عنوان مقاله [English]
Generation of Nonlinear Currents and Helicon Waves in a Semiconductor Quantum Plasma
نویسندگان [English]
- A Mehramiz
- B Rajabi
Physics Department, Factually of Science, Imam Khomeini International University Qazvin – Iran
چکیده [English]
In this paper, an analytical investigation has been presented on the excitation of nonlinear current densities and helicon waves resulting from the interaction of the electromagnetic pump waves in a semiconductor quantum plasma. For this parpose, a system of modified fluid equations has been used to find the nonlinear response of electrons in the semiconductor in the presence of an external magnetic field. It is shown that due to the interaction of two electromagnetic pump waves in the semiconductor medium, a pondermotive force at the beating frequency becomes finite and generates a helicon wave. Furthermore, the power carried by the excited helicon wave is calculated and evaluated relative to the typical parameters of a solid state plasma medium. The results indicate that the power of the excited wave gradually increases with the external magnetic field, as well as, the equilibrium density of the carriers, and decreases by the electron-phonon collision frequency.
کلیدواژه‌ها [English]
- Nonlinear Currents
- Semiconductor Plasma
- Helicon Wave
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