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arXiv 2606.09232cond-mat.mes-hall
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单层黑磷烯中应变诱导的三次谐波产生调谐

Strain-Induced Tuning of Third-Harmonic Generation in Monolayer Black Phosphorene

University of Science and Technology Beijing(北京科技大学);Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences(中国科学院长春光学精密机械与物理研究所);Zhengzhou University(郑州大学)

Yan Meng, Kainan Chang, Wei Song, Yuwei Shan, Jin Luo Cheng, Luxia Wang

AI总结:

基于紧束缚模型和半导体布洛赫方程,揭示了应变工程调控单层黑磷烯三次谐波产生的微观机制,发现面内压缩和面外拉伸应变增强THG并导致红移,而面内拉伸和面外压缩则抑制THG并导致蓝移,调谐效率遵循z>y>x顺序。

摘要:

基于紧束缚模型和半导体布洛赫方程,本工作系统地揭示了应变工程调控单层黑磷烯(BP)中三次谐波产生(THG)的微观机制。结果表明,在无应变条件下,单层BP表现出显著的面内各向异性,其主导的磁化率分量达到最大值$χ^{(3);xxxx} = 1.8 \times 10^{-17} \, \text{m}^2/\text{V}^2$,与实验结果吻合良好。通过沿扶手椅($x$)、锯齿形($y$)和面外($z$)方向施加单轴和双轴应变,我们发现THG响应表现出强烈的方向依赖性和独特的光谱移动行为:面内压缩应变和面外拉伸应变均显著增强THG电导率并导致红移,而面内拉伸应变和面外压缩则导致抑制和蓝移,调谐效率遵循$z > y > x$的顺序。这些现象的微观起源被识别为应变对带隙和贝里连接的协同调制。此外,双轴应变的协同或竞争效应进一步丰富了THG信号的操控。应变工程可作为动态控制二维材料中非线性光学过程的有效策略,也为开发高性能可重构红外光子器件奠定了理论基础。

英文摘要:

Based on the tight-binding model and the semiconductor Bloch equations, this work systematically reveals the microscopic mechanism of strain engineering in turning of third-harmonic generation (THG) in monolayer black phosphorene (BP). % The results show that under strain-free conditions, monolayer BP exhibits significant in-plane anisotropy, and its dominant susceptibility component reaches a maximum of $χ^{(3);xxxx} = 1.8 \times 10^{-17} \, \text{m}^2/\text{V}^2$, agreeing well with the experimental results. % By applying uniaxial and biaxial strains along the armchair ($x$), zigzag ($y$), and out-of-plane ($z$) directions, we find that the THG response presents strong direction dependence and unique spectral shifting behaviors: in-plane compressive strain and out-of-plane tensile strain both significantly enhance the THG conductivity and induce a redshift, whereas in-plane tensile strain and out-of-plane compression lead to suppression and a blueshift, with the tuning efficiency following the order of $z > y > x$. The microscopic origin of these phenomena is identified as the synergistic modulation of the bandgap and Berry connection by strain. % Furthermore, the synergistic or competitive effects of biaxial strain further enrich the manipulation of THG signals. % Strain engineering can serve as an effective strategy for dynamically controlling nonlinear optical processes in two-dimensional materials, and it also lays a theoretical foundation for the development of high-performance reconfigurable infrared photonic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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