Precise measurement of correlation parameters driving optical transparency in CaVO3 thin film by steady state and time resolved terahertz spectroscopy
Precise measurement of correlation parameters driving optical transparency in CaVO3 thin film by steady state and time resolved terahertz spectroscopy
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通过稳态和时间分辨太赫兹光谱精确测量 CaVO3 薄膜中驱动光学透明度的相关参数
DOI：
10.1063/5.0091664
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发表时间：
2022
影响因子：
3.2
通讯作者：
D. S. Rana
中科院分区：
文献类型：
--
作者：
P. Anagha;Monu Kinha;A. Khare;D. S. Rana
在快速发展的光电和光伏产业中，透明导电材料是不可避免的。相关金属是一类新兴材料，其电荷密度与相关效应提供透明度的金属相当。因此，了解这些材料的基本物理原理对于提高设备的性能同样重要。我们使用太赫兹时域和时间分辨太赫兹光谱测量研究了 CaVO3 (CVO) 薄膜的低能和非平衡动力学。尽管 CVO 薄膜的电阻率显示出类似费米液体的特征，但太赫兹电导动力学揭示了金属-绝缘体转变的存在。此外，质量重整化效应表明电子相关性和声子相互作用在驱动该系统的基态方面的竞争。很明显，光激发载流子的弛豫是通过电子-声子热化进行的，综合研究显示了具有电子相关性的系统的金属性质。因此，提取的 CVO 光学和电学参数与现有的透明导电材料相当，因此使该系统成为透明电子器件的另一个潜在候选者。
Transparent conducting materials are inevitable in the fast-developing optoelectronic and photovoltaic industries. Correlated metals are emerging classes of materials that possess a charge density comparable to the metals in which the correlation effects provide transparency. So, understanding the fundamental physics of these materials is equally important to improve the performance of devices. We have investigated the low energy and non-equilibrium dynamics of the CaVO3 (CVO) thin film using terahertz time-domain and time-resolved terahertz spectroscopic measurements. Though the electrical resistivity of the CVO thin film shows a Fermi liquid-like signature, the terahertz conductivity dynamics unveil the presence of metal-insulator transition. Furthermore, the mass renormalization effects indicate the competition between electron correlations and phonon interactions in driving the ground state of this system. It is clear that the relaxation of photo-excited carriers is through electron–phonon thermalization, and comprehensive studies show the metallic nature of the system with electron correlations. Thus, the extracted optical and electrical parameters of CVO are comparable with the existing transparent conducting materials and, hence, make this system another potential candidate for transparent electronics.
影响因子：
4.6
作者：
Arezoomandan S;Prakash A;Chanana A;Yue J;Mao J;Blair S;Nahata A;Jalan B;Sensale-Rodriguez B
通讯作者：
Sensale-Rodriguez B