Coupled cylindrical quantum well wires in broken symmetry: effects of intense laser field on the harmonic generations

IF 2.8 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY The European Physical Journal Plus Pub Date : 2024-10-21 DOI:10.1140/epjp/s13360-024-05715-w

B. O. Alaydin, O. Ozturk, D. Altun, E. Ozturk

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Abstract

This study explores the high harmonic generations in GaAs/Al_xGa_1-xAs asymmetric coupled cylindrical quantum well wires (CCQWWs) under varying intense laser fields (ILFs). The structural parameters and theoretical framework are detailed, including the Schrödinger equation for the CCQWW heterojunction and the Floquet method to model ILF effects. Numerical simulations reveal alterations in the confinement potential and energy states of CCQWWs with increasing ILF intensity. Notably, significant changes occur in the potential well shape, influencing the localization of energy states. Transition energies and dipole moment matrix elements are analyzed, highlighting shifts in resonance peaks and their intensities. The study identifies blue-shift points at α₀ (ILF parameter) values of 4.4 nm, 4.7 nm, and 3.7 nm for transition energies E₂₁, E₃₁/2, and E₄₁/3, respectively, followed by red-shift trends as α₀ increases further. Maximum enhancements are observed in the second harmonic generation coefficient at ILF α₀ = 6 nm and the third harmonic generation coefficient at α₀ = 8 nm, which is 1000 times higher than at α₀ = 0 nm. These findings underscore the potential for enhancing semiconductor device production through optimized ILF induced high harmonic generation.

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破对称耦合圆柱形量子阱导线：强激光场对谐波发生的影响

本研究探讨了 GaAs/AlxGa1-xAs 非对称耦合圆柱量子阱线 (CCQWW) 在不同强激光场 (ILF) 下的高次谐波产生。详细介绍了结构参数和理论框架，包括 CCQWW 异质结的薛定谔方程和模拟 ILF 效应的 Floquet 方法。数值模拟揭示了随着ILF强度的增加，CCQWW的约束势和能态的变化。值得注意的是，势阱形状发生了重大变化，影响了能态的定位。研究分析了转换能量和偶极矩矩阵元素，突出了共振峰及其强度的变化。研究发现，当转换能量 E21、E31/2 和 E41/3 的 α0（ILF 参数）值分别为 4.4 nm、4.7 nm 和 3.7 nm 时，会出现蓝移点。在 ILF α0 = 6 nm 时，二次谐波发生系数和三次谐波发生系数在 α0 = 8 nm 时达到最大值，是 α0 = 0 nm 时的 1000 倍。这些发现强调了通过优化 ILF 诱导的高次谐波生成来提高半导体器件生产的潜力。

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来源期刊

The European Physical Journal Plus PHYSICS, MULTIDISCIPLINARY-

CiteScore

5.40

自引率

8.80%

发文量

1150

审稿时长

4-8 weeks

期刊介绍： The aims of this peer-reviewed online journal are to distribute and archive all relevant material required to document, assess, validate and reconstruct in detail the body of knowledge in the physical and related sciences. The scope of EPJ Plus encompasses a broad landscape of fields and disciplines in the physical and related sciences - such as covered by the topical EPJ journals and with the explicit addition of geophysics, astrophysics, general relativity and cosmology, mathematical and quantum physics, classical and fluid mechanics, accelerator and medical physics, as well as physics techniques applied to any other topics, including energy, environment and cultural heritage.