Chen Zhihui, Fan Wenxuan, Xu Defeng, Dong Yulan, Chen Zhi, Gu Ziyang, Fang Mei, Xiao Si, Zhu Menglong, He Jun
Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, China.
Department of Applied Physics, School of Microelectronics and Physics, Hunan University of Technology and Business, Changsha 410205, China.
J Phys Chem Lett. 2022 Aug 25;13(33):7770-7778. doi: 10.1021/acs.jpclett.2c01740. Epub 2022 Aug 15.
Two-dimensional ternary transition metal chalcogenides (TMCs) have aroused great research interest owing to outstanding semiconducting properties and diverse magnetic response. CuFeTe, 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 CuFeTe nanosheets. The nonlinear absorption and refraction coefficients reach -0.22 cm/GW and -1.66 × 10 cm/W, respectively. Semiempirical theory for direct bandgap semiconductors was applied to estimate the nonlinearities of CuFeTe nanosheets. The calculation results indicate that the efficient nonlinearities stem from the free carrier induced band filling effect.
二维三元过渡金属硫族化合物（TMCs）因其出色的半导体性能和多样的磁响应而引起了极大的研究兴趣。作为一种典型的TMC，CuFeTe表现出不明确的磁行为和自旋密度波性质的基态。在此，我们首次报道了CuFeTe纳米片的高效非线性吸收和优异的非线性折射。非线性吸收系数和折射系数分别达到-0.22 cm/GW和-1.66×10 cm/W。应用直接带隙半导体的半经验理论来估计CuFeTe纳米片的非线性特性。计算结果表明，高效的非线性特性源于自由载流子诱导的能带填充效应。
