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运用Kubo公式对圆柱形金属纳米线的磁光响应特性进行了理论研究。结果发现:与具有抛物线型电子限制势的低维半导体量子线不同,金属纳米线的磁光吸收谱以及相位延迟响应都敏感地依赖于光的偏振,这主要是由于不同的偏振光具有不同的磁光选择定则所致。另外,电子在不同子能带间磁光跃迁所产生的光吸收在太赫兹频率范围,可以通过改变纳米线半径以及调节磁场强度来有效调节金属纳米线在太赫兹频段的共振磁光吸收特性。这些理论结果揭示了金属纳米线的基本磁光响应特性。
The Kubo formula was used to study the magneto-optic response of cylindrical metallic nanowires. The results show that, unlike the low-dimensional semiconducting quantum wires with parabolic electron confinement potential, the magnetooptical absorption spectra and the phase delay responses of metal nanowires are all sensitively dependent on the polarization of light, mainly due to different polarized light having different Magneto-optical selection rules. In addition, the absorption of electrons generated by magneto-optic transitions between different sub-bands in the terahertz frequency range can effectively adjust the resonant magneto-optical absorption characteristics of the metal nanowires in the terahertz band by changing the nanowire radius and adjusting the magnetic field strength. These theoretical results reveal the basic magneto-optic response of metallic nanowires.