THz and subTHz Excitations in Graphene Based Materials:Magneto-Optical Studies

石墨烯基材料中的太赫兹和亚太赫兹激发：磁光研究

• 批准号: 262040769
• 负责人: Dr.-Ing. Petr Neugebauer, Ph.D.
• 金额: --
• 依托单位: Department of Materials
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/262040769?language=en
• 关键词: THz; subTHz; Excitations; Graphene; Based

This project aims to achieve a detailed understanding of the low-energy electronic structure of graphene based materials prepared by different methods such as epitaxial growth, CVD, exfoliation or decoupled graphene from bulk graphite. This will be done by magneto-optical studies in the THz- and sub-THz region using infrared and high frequency electron paramagnetic resonance spectrometers, respectively, both in frequency and magnetic field domains. We propose the first systematic comparative study of graphene specimens, which differ by substrate, defects, size and grain boundaries etc. Noninvasive low-energy (0.4-40 meV) experimental methods will bring decisive information about limits of intrinsic charge mobility, the electronic band structure (Fermi surface) and other phenomena, like confined plasmons, magnetic excitations etc. The low-energy excitations will be followed as a function of numbers of layers, to map and understand the change in electronic properties going from monolayer to bulk graphite. We will also perform the first microwave magneto-absorption measurements in gated graphene flakes with the aim to control confined plasmon frequency. This will be the first step towards optoelectronic devices.

该项目旨在详细了解通过不同方法制备的石墨烯基材料的低能电子结构，例如外延生长，CVD，剥离或从块状石墨中分离石墨烯。这将通过磁光研究在太赫兹和亚太赫兹区域使用红外和高频电子顺磁共振光谱仪，分别在频率和磁场域。我们首次对石墨烯样品进行了系统的比较研究，这些样品因基底、缺陷、尺寸和晶界等而不同。（0.4-40 meV）的实验方法将带来关于本征电荷迁移率极限、电子能带结构的决定性信息。（费米面）和其他现象，如约束等离子体激元，磁激发等。低能激发将作为层数的函数，来绘制和理解从单层到块状石墨的电子性质的变化。我们还将在门控石墨烯薄片中进行第一次微波磁吸收测量，目的是控制受限的等离子体频率。这将是迈向光电器件的第一步。