Electric Field and Impurity Effects on the Electronic Levels and Optical Properties of Spherical Segment Quantum Dot/Wetting Layer Interacted with Two Laser Fields

Journal of Optoelectronical Nanostructures

دوره 9، شماره 1 - شماره پیاپی 33، اردیبهشت 2024، صفحه 79-95   

نوع مقاله: Articles

شناسه دیجیتال (DOI): 10.30495/jopn.2024.32976.1311

نویسندگان

Reyhane Ezadi؛ Masoomeh Dezhkam^*

Department of Physics, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran

تاریخ دریافت: 09 بهمن 1402،  تاریخ بازنگری: 23 اسفند 1402،  تاریخ پذیرش: 11 اسفند 1402 

چکیده

Abstract
We calculate electronic levels of spherical segment quantum dot on top of wetting layer with and without hydrogenic impurity interacted with external electric field numerically. Results show that as the electric field increases, the three lowest level energies decrease. The binding energy of the ground (first excited) state of the system decreases (increases) as the electric field increases. Then we consider the system influenced by two laser fields and investigate the optical properties of the system at the electric field. As results show, the linear and nonlinear absorptions and dispersions of the probe pulse shift to higher frequencies as the electric field increases. For the certain electric field, the optical properties reduce and shift toward higher frequencies when impurity is added. Finally, the group velocity of the probe pulse in the system is calculated. As the electric field increases, the slow light frequency range transfers to the higher probe frequencies.

کلیدواژه‌ها

Electric Field؛ Group Velocity of Light؛ Impurity؛ Optical Property؛ Quantum Dot/Wetting Layer

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