The control of nonlinear optical properties in a doped asymmetric quantum dot by the spin-orbit coupling and external electric field

Document Type : Original Article

Author

Department of Physics, Faculty of Sciences, Sahand University of Technology, Tabriz, Iran

Abstract

The Rashba spin-orbit coupling in nanostructures is an important parameter that can affect their physical properties. Hence, it is demonstrated that the nonlinear optical properties of quantum dot such as second harmonic generation and optical rectification can be controlled by the Rashba spin-orbit coupling. Also, the effect of electric field and confinement potential strength on the nonlinear optical properties is examined. Our numerical study shows that magnitude of the second harmonic generation raises when the Rashba strength increases, while its peak position is not shifted. Moreover, the optical rectification of doped asymmetric quantum dot shifts to higher energies when the electric field enhances.

Keywords

Main Subjects

Article Title [Persian]

کنترل خواص اپتیکی غیرخطی در نقطه کوانتومی نامتقارن آلاییده توسط جفت شدگی اسپین-مدار راشبا و میدان الکتریکی خارجی

Author [Persian]

  • پریناز حسین پور

گروه فیزیک، دانشکده علوم، دانشگاه صنعتی سهند، تبریز، ایران

Abstract [Persian]

جفت شدگی اسپین-مدار راشبا در نانوساختارها یک پارامتر مهم می باشد و بر روی خواص فیزیک آنها تأثیرگذار است. از اینرو، نشان داده شده است که خواص نوری غیرخطی نقطه کوانتومی از قبیل تولید هماهنگ دوم و یکسوساز نوری می تواند توسط جفت شدگی اسپین-مدار راشبا کنترل شود. همچنین، تأثیر میدان الکتریکی و پتانسیل محبوس سازی نیز بر روی خواص نوری غیرخطی بررسی شده است. مطالعات عددی نشان می دهند که مقدار SHG وقتیکه قدرت جفت شدگی افزایش می یابد، بیشتر می شود، در حالیکه مکان پیک آن جابجا نمی شود. بعلاوه، با افزایش میدان الکتریکی، میزان یکسوسازی نوری نقطه کوانتومی نامتقارن به سمت طول موجهای با انرژیی بیشتر جابجا می شود.

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