Effects of magnetic field and structural parameters on multi-photon absorption spectra in Morse quantum wells with electron–phonon interactions

IF 2.7 Q2 PHYSICS, CONDENSED MATTER
Tran Ky Vi , Nguyen Anh Tuan , Le Nguyen Dinh Khoi , Nguyen Quang Hoc , Anh-Tuan Tran
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Abstract

We present a systematic theoretical study of the multi-photon nonlinear optical absorption properties of a GaAs/AlxGa1xAs based quantum well (QW) structure with Morse confinement potential under the influence of a magnetic field. Based on the stationary states due to the electron confinement in Morse QWs and the Landau levels obtained by solving the Schrodinger equation in the effective mass approximation, we have developed calculations for the optical absorption power with MPA using second-order perturbation theory. Our model accounts for electron–phonon interactions and considers both optical and acoustic phonon mechanisms in the MPA process. Our findings show that the one-photon absorption (1PA) peaks are larger and appear to the right of the two-photon absorption (2PA) peaks, whereas 2PA peaks are larger and occur to the right of three-photon absorption (3PA) peaks. The resonance peak positions follow the magneto-phonon resonance condition and are temperature-independent. Increasing the magnetic field and aluminum concentration induces a blue shift in the absorption spectra, whereas increasing the QW width leads to a red shift. Variations in magnetic field, aluminum concentration, and QW width also affect the peak intensities and full-width at half maximum (FWHM), with increasing values of the former two enhancing the FWHM, while expanding the QW width reduces it. Thermal excitations increase peak intensity without shifting their positions. Our study highlights the significance of nonlinear absorption processes (2PA, 3PA) in understanding optical absorption, despite their smaller FWHM compared to linear absorption (1PA). Overall, the Morse QW model demonstrates promising magneto-optical properties, making it a strong candidate for future optoelectronic device applications.
磁场和结构参数对电子-声子相互作用下莫尔斯量子阱中多光子吸收光谱的影响
本文对磁场影响下具有莫尔斯约束势的GaAs/AlxGa1−xAs基量子阱(QW)结构的多光子非线性光学吸收特性进行了系统的理论研究。基于莫尔斯量子阱中由于电子约束而产生的定态和在有效质量近似下求解薛定谔方程得到的朗道能级,我们利用二阶摄动理论推导出了光吸收功率的计算公式。我们的模型考虑了电子-声子相互作用,并考虑了MPA过程中的光学和声学声子机制。结果表明,单光子吸收(1PA)峰较大,出现在双光子吸收(2PA)峰的右侧,而二光子吸收(2PA)峰较大,出现在三光子吸收(3PA)峰的右侧。共振峰位置遵循磁声子共振条件,与温度无关。增加磁场和铝浓度会导致吸收光谱的蓝移,而增加量子阱宽度会导致吸收光谱的红移。磁场、铝浓度和QW宽度的变化也会影响峰强度和半峰全宽(FWHM),前两者的增加会增强FWHM,而QW宽度的扩大会降低FWHM。热激励在不改变其位置的情况下增加峰值强度。我们的研究强调了非线性吸收过程(2PA, 3PA)在理解光吸收方面的重要性,尽管它们的频宽比线性吸收(1PA)小。总体而言,Morse QW模型显示出有希望的磁光特性,使其成为未来光电器件应用的有力候选者。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
6.50
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0.00%
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