Superconductivity in graphene on surfaces

表面石墨烯的超导性

• 批准号: 277240993
• 负责人: Professor Dr. Jörg Kröger
• 金额: --
• 依托单位: Institute for Molecules and Materials
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/277240993?language=en
• 关键词: Superconductivity; graphene; surfaces

The repertoire of unique graphene properties is lacking superconductivity. Theoretical suggestions for achieving the superconducting state in graphene, e.g., alkali metal intercalation or injection of Cooper pairs by the proximity effect, have been published. Experimental evidence for the predicted scenarios, however, is scarce or even absent. The main target of the proposed research project is thus filling the gap of experimental verification. To this end simple model systems will be analyzed in a surface science approach. Superconductivity shall be induced in graphene on metal surfaces by two procedures. First, Li will be adsorbed on single-layer and bilayer graphene on Ir(111). Second, the proximity effect will be used to inject Cooper pairs from Nb(110) into a single adsorbed graphene sheet. The response of the superconducting state to the presence of nonmagnetic (Ag) and magnetic (Fe, Mn) impurities will be unravelled by the presence or absence of resonances inside the energy gap of superconducting graphene. Low-temperature scanning tunnelling microscopy and spectroscopy together with angle-resolved inelastic electron scattering will be used to obtain a comprehensive picture of graphene superconductivity.

石墨烯独特的特性缺乏超导性。已经发表了在石墨烯中实现超导态的理论建议，例如碱金属嵌入或通过邻近效应注入库珀对。然而，预测场景的实验证据很少甚至不存在。因此，拟议研究项目的主要目标是填补实验验证的空白。为此，将以表面科学方法分析简单的模型系统。应通过两个程序在金属表面上的石墨烯中诱导超导性。首先，Li将被吸附在Ir(111)上的单层和双层石墨烯上。其次，邻近效应将用于将 Nb(110) 的库珀对注入到单个吸附的石墨烯片中。超导态对非磁性（Ag）和磁性（Fe、Mn）杂质存在的响应将通过超导石墨烯能隙内是否存在共振来阐明。低温扫描隧道显微镜和光谱学以及角分辨非弹性电子散射将用于获得石墨烯超导性的全面图像。