arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2207.11366cond-mat.mtrl-sci
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富勒烯单分子膜的高度面内各向异性光学性质

Highly in-plane anisotropic optical properties of fullerene monolayers

Danwen Yuan, Hanqi Pi, Yi Jiang, Yuefang Hu, Liqin Zhou, Yujin Jia, Gang Su, Zhong Fang, Hongming Weng, Xinguo Ren, Wei Zhang

摘要:

本征各向异性光学材料和富勒烯自组装二维光学材料在基础科学和应用领域都引起了广泛的兴趣。单层(ML)富勒烯的合成使得这两个特征的组合似乎是合理的。本文采用第一性原理计算,系统地研究了准六方相(qHP)和准四方相(qTP)ML富勒烯的电子结构和光学性质。计算结果表明,qHP ML是一种各向异性光吸收较小的半导体,这与最近的实验测量结果一致。然而,qTP ML的结果表明,它是一种具有高度面内各向异性吸收的半金属。二色性比,即$x$ -和$y$ -偏振光$α$ $_x$ $_x$ / $α$ $_y$ $_y$的吸收比,在0.29 eV的光子能量下约为12.当光子能量在0.7和1.4 eV之间时,这种各向异性更加明显,其中$α$ $_x$ $_x$几乎变为零,而$α$ $_y$ $_y$大两个数量级以上。这表明qTP ML作为长期追求的无损金属的候选者和原子级薄偏振器的潜在材料。我们希望这将刺激在qTP ML和其他富勒烯组装的2D材料的研究进一步的实验努力。

英文摘要:

Both the intrinsic anisotropic optical materials and fullerene-assembled 2D materials have attracted a lot of interests in fundamental science and potential applications. The synthesis of a monolayer (ML) fullerene makes the combination of these two features plausible. In this work, using first-principles calculations, we systematically study the electronic structure, optical properties of quasi-hexagonal phase (qHP) ML and quasi-tetragonal phase (qTP) ML fullerenes. The calculations of qHP ML show that it is a semi-conductor with small anisotropic optical absorption, which agrees with the recent experimental measurements. However, the results for qTP ML reveal that it is a semimetal with highly in-plane anisotropic absorption. The dichroic ratio, namely the absorption ratio of $x$- and $y$-polarized light $α$$_x$$_x$/$α$$_y$$_y$, is around 12 at photon energy of 0.29 eV. This anisotropy is much more pronounced when the photon energy is between 0.7 and 1.4 eV, where $α$$_x$$_x$ becomes nearly zero while $α$$_y$$_y$ is more than two orders of magnitude larger. This indicates qTP ML as a candidate for long-pursuit lossless metal and a potential material for atomically thin polarizer. We hope this will stimulate further experimental efforts in the study of qTP ML and other fullerene-assembled 2D materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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