Light–Matter Interaction in Quantum Confined 2D Polar Metals
Light–Matter Interaction in Quantum Confined 2D Polar Metals
复制标题
DOI：
10.1002/adfm.202005977
复制
发表时间：
2020-10
影响因子：
19
通讯作者：
Katharina Nisi;S. Subramanian;Wen He;K. Ulman;Hesham M El-Sherif;F. Sigger;Margaux Lassaunière;Maxwell T. Wetherington;Natalie C Briggs;J. Gray;A. Holleitner;N. Bassim;S. Y. Quek;J. Robinson;U. Wurstbauer
中科院分区：
文献类型：
--
作者：
Katharina Nisi;S. Subramanian;Wen He;K. Ulman;Hesham M El-Sherif;F. Sigger;Margaux Lassaunière;Maxwell T. Wetherington;Natalie C Briggs;J. Gray;A. Holleitner;N. Bassim;S. Y. Quek;J. Robinson;U. Wurstbauer
本工作对二维镓、铟薄膜的面内介电性能进行了系统的实验和理论研究，该薄膜由碳化硅和石墨烯之间的两个或三个原子金属层组成，对应的成键梯度是从共价到金属再到范德华类型。确定了K空间分辨自由电子和束缚电子对光学响应的贡献，后者指向存在与厚度相关的量子限制现象。介电函数中的共振能量和在近红外到可见光光谱范围内观察到的epsilon近零行为，取决于金属原子层数和所涉及的金属的性质。基于模型的光谱椭偏测量法被用来估计原子金属层的数量，提供了一条比昂贵的侵入性表征技术更方便的途径。光-物质相互作用对厚度和金属选择的强烈依赖性使得这些半范德华2D极性金属对量子工程金属薄膜、可调谐(量子)等离子体和纳米光子学具有吸引力。
This work is a systematic experimental and theoretical study of the in‐plane dielectric functions of 2D gallium and indium films consisting of two or three atomic metal layers confined between silicon carbide and graphene with a corresponding bonding gradient from covalent to metallic to van der Waals type. k‐space resolved free electron and bound electron contributions to the optical response are identified, with the latter pointing towards the existence of thickness dependent quantum confinement phenomena. The resonance energies in the dielectric functions and the observed epsilon near‐zero behavior in the near infrared to visible spectral range, are dependent on the number of atomic metal layers and properties of the metal involved. A model‐based spectroscopic ellipsometry approach is used to estimate the number of atomic metal layers, providing a convenient route over expensive invasive characterization techniques. A strong thickness and metal choice dependence of the light–matter interaction makes these half van der Waals 2D polar metals attractive for quantum engineered metal films, tunable (quantum‐)plasmonics and nano‐photonics.