Investigation of strain-induced modulation on electronic and optical properties of monolayer of BSb

IF 3 Q3 Physics and Astronomy
Raad Chegel , Ahmad I. Ayesh
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引用次数: 0

Abstract

This work presents a comprehensive theoretical investigation of the electronic and optical responses of monolayer honeycomb boron antimony (h-BSb) and hexagonal boron phosphide (h-BP) under various biaxial strain conditions, employing a tight-binding approach validated through DFT calculations. Our findings reveal that monolayer h-BSb possesses a direct band gap that can be effectively modulated through mechanical strain: tensile strain raises the band gap, whereas compressive strain decreases it. This strain-induced tunability manifests directly in the optical spectra, where prominent optical peaks exhibit significant redshifts under compressive strain and blueshifts under tensile conditions. The refractive index n(ω) demonstrates clear strain-dependent modulations, with the zero-frequency value increasing under compressive strain and decreasing under tensile deformation. Additionally, the DC Kerr effect displays a distinctive double-peak structure that shows high sensitivity to mechanical strain. Comparative analysis demonstrates that monolayer h-BSb exhibits lower-energy optical transitions and enhanced sensitivity to strain-induced peak displacement compared to h-BP. This superior performance stems from h-BSb’s small band gap and narrow interband separations at the points of high-symmetry in the Brillouin zone. These characteristics position h-BSb as a highly promising material for strain-engineered optoelectronic applications, particularly in infrared photodetectors and sensors.
应变诱导调制对BSb单层电子学和光学性质的影响
本文采用紧密结合的方法,通过DFT计算验证了单层蜂窝状硼锑(h-BSb)和六方磷化硼(h-BP)在各种双轴应变条件下的电子和光学响应的全面理论研究。我们的研究结果表明,单层h-BSb具有直接带隙,可以通过机械应变有效地调节:拉伸应变增大带隙,而压缩应变减小带隙。这种应变诱导的可调性直接表现在光谱中,其中突出的光学峰在压缩应变下表现出明显的红移,在拉伸条件下表现出明显的蓝移。折射率n(ω)表现出明显的应变相关调制,零频率值在压缩应变下增大,在拉伸变形下减小。此外,DC克尔效应表现出独特的双峰结构,对机械应变具有很高的灵敏度。对比分析表明,与h-BP相比,单层h-BSb具有较低能量的光学跃迁和对应变引起的峰值位移的敏感性增强。这种优异的性能源于h-BSb在布里渊区高对称性点处的小带隙和窄带间分离。这些特性使h-BSb成为应变工程光电应用中非常有前途的材料,特别是在红外光电探测器和传感器中。
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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来源期刊
Results in Optics
Results in Optics Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
2.50
自引率
0.00%
发文量
115
审稿时长
71 days
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