太赫兹辐射
钻石
材料科学
兴奋剂
磁电机
氮气
磁光
光电子学
凝聚态物理
复合材料
物理
磁场
化学
物理化学
量子力学
燃烧
作者
Huan Xiao,Hua Wen,W. Xu,Yingying Cheng,Jing Zhang,Xingjia Cheng,Yiming Xiao,Lan Ding,Haowen Li,Bang-Quan He,F. M. Peeters
标识
DOI:10.1016/j.infrared.2024.105237
摘要
Nitrogen-doped diamond (N-D) is one of the most important carbon-based electronic and optical materials. Here we study the terahertz (THz) magneto-optical (MO) properties of N-D grown by microwave plasma-enhanced chemical vapor deposition. The optical microscope, SEM, XRD, Raman spectrum, FTIR spectroscopy and XPS are used for the characterization of N-D samples. Applying THz time-domain spectroscopy (TDS), in combination with the polarization test and the presence of magnetic field in Faraday geometry, THz MO transmissions through N-D are measured from 0 to 8 T at 80 K. The complex right- and left-handed circular transmission coefficients and MO conductivities for N-D are obtained accordingly. Through fitting the experimental results with theoretical formulas of the dielectric constant and MO conductivities for an electron gas, we are able to determine magneto-optically the key electronic parameters of N-D, such as the static dielectric constant εb, the electron density ne, the electronic relaxation time τ, the electronic localization factor α and, particularly, the effective electron mass m* obtained under non-resonant condition. The dependence of these parameters upon magnetic field is examined and analyzed. We find that the MO conductivities of N-D can be described rightly by the MO Drude-Smith formulas developed by us previously. It is shown that N-doping and the presence of the magnetic field can lead towards the larger εb and heavier m* in diamond, while ne/τ/α in N-D decreases/increases/decreases with increasing magnetic field. The results obtained from this work are benefit to us in gaining an in-depth understanding of the electronic and optoelectronic properties of N-D.
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