Origin of the Efficient Nonlinear Optical Response of Two-Dimensional Layered CuFeTe2 Nanosheets.
Origin of the Efficient Nonlinear Optical Response of Two-Dimensional Layered CuFeTe2 Nanosheets.
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DOI：
10.1021/acs.jpclett.2c01740
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Zhihui Chen;Wenxuan Fan;Defeng Xu;Yulan Dong;Zhi Chen;Ziyang Gu;Mei Fang;S. Xiao;Menglong Zhu;Jun He
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文献类型：
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作者：
Zhihui Chen;Wenxuan Fan;Defeng Xu;Yulan Dong;Zhi Chen;Ziyang Gu;Mei Fang;S. Xiao;Menglong Zhu;Jun He
二维三元过渡金属硫属化合物（TMCs）由于其优异的半导体性能和多样的磁响应特性，引起了人们极大的研究兴趣。CuFeTe 2作为一种典型的TMC材料，具有不确定的磁行为和自旋密度波的基态性质。在此，我们首次报道了CuFeTe 2纳米片的有效非线性吸收和上级非线性折射。非线性吸收系数和折射系数分别达到-0.22 cm/GW和-1.66 × 10-12 cm 2/W。应用直接带隙半导体的半经验理论来估计CuFeTe 2纳米片的非线性。计算结果表明，有效的非线性源于自由载流子引起的带填充效应。
Two-dimensional ternary transition metal chalcogenides (TMCs) have aroused great research interest owing to outstanding semiconducting properties and diverse magnetic response. CuFeTe2, as a typical TMC, exhibits ambiguous magnetic behavior and ground state of spin density waves nature. Herein, we first report efficient nonlinear absorption and superior nonlinear refraction of CuFeTe2 nanosheets. The nonlinear absorption and refraction coefficients reach -0.22 cm/GW and -1.66 × 10-12 cm2/W, respectively. Semiempirical theory for direct bandgap semiconductors was applied to estimate the nonlinearities of CuFeTe2 nanosheets. The calculation results indicate that the efficient nonlinearities stem from the free carrier induced band filling effect.