Study of intrinsic and extrinsic phenomena in the electrical transport properties of multi-graphene

多层石墨烯电输运特性的内在和外在现象研究

• 批准号: 68584812
• 负责人: Professor Dr. Pablo David Esquinazi
• 金额: --
• 依托单位: Abteilung Supraleitung und Magnetismus
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/68584812?language=en
• 关键词: Study; intrinsic; extrinsic; phenomena; electrical

The aim of the proposal is the experimental identification of defect-free or weak defect density,two- and three-dimensional graphite (multigraphene) structures and a thorough study of theirmagneto-transport properties. The study of electrical anisotropy of single crystalline structure of multigraphene will provide a final answer on the coupling between graphene layers. TheQuantum Hall Effect and Magnetoresistance will be studied as a function of sample quality andgeometry and as a function of induced atomic lattice defects on the micro- and nano structures bymeans of a low-fluence, high-energy proton nanobeam. The experimental studies cover theidentification of single crystalline homogeneous multigraphene regions by means of electrostaticforce microscopy (EFM) and electron backscattering diffraction (EBSD) as well as the defectcharacterization using positron annihilation and other techniques. Due to the defect induced para-and ferromagnetism in graphite the study of the Anomalous Hall and Quantum Hall Effects in theirradiated micro structures is of special interest. The influence of the electrical contacts as well asnano-constrictions on the measured signals will also be studied using different experimentalapproaches.

该提案的目的是实验性鉴定无缺陷或弱缺陷密度，二维石墨（多封剂）结构，以及对HUNSMAGNETO-TRANSPORT特性的全面研究。多磷酸单晶体结构的电向的电动环境研究将为石墨烯层之间的耦合提供最终答案。将根据样品质量和几何测定法的函数研究thequantum hall效应和磁性，并根据诱导的原子晶格缺陷的函数在微和纳米结构上的原子晶状体缺陷，而低纤维，高能量质子纳米孔的均值。实验研究涵盖了通过静电图显微镜（EFM）和电子反向散射衍射（EBSD）以及使用正电子歼灭和其他技术鉴定单晶均质多磷酸区域的识别。由于缺陷引起了石墨中的para和铁磁性，因此对其辐射的微结构中的异常大厅和量子大厅效应的研究是特别感兴趣的。还将使用不同的实验透镜研究电触点以及纳诺收缩对测量信号的影响。