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arXiv 0907.3661cond-mat.mes-hall
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金属修饰石墨烯片的可调谐超导相变

Tunable Superconducting Phase Transition in Metal-Decorated Graphene Sheets

B. M. Kessler, C. O. Girit, A. Zettl, V. Bouchiat

摘要:

使用典型的实验技术,很难在二维中分离载流子密度和无序对超导转变的影响。使用基于金属层去湿的简单制造过程,我们已经生产了用纳米级锡簇的非结晶网络装饰的石墨烯片。这些金属团簇既有效地掺杂石墨烯衬底,又诱导长程超导关联。这使我们能够研究在固定的无序和可变的载流子浓度的超导转变。我们发现,尽管在介观长度尺度(10-100 nm)的结构不均匀性,这种材料的电子行为作为一个均匀的脏超导体。我们简单的自组装方法建立了石墨烯作为一个理想的可调衬底研究诱导二维电子系统在固定的无序和我们的技术可以很容易地扩展到其他序参量,如磁性。

英文摘要:

Using typical experimental techniques it is difficult to separate the effects of carrier density and disorder on the superconducting transition in two dimensions. Using a simple fabrication procedure based on metal layer dewetting, we have produced graphene sheets decorated with a non-percolating network of nanoscale tin clusters. These metal clusters both efficiently dope the graphene substrate and induce long-range superconducting correlations. This allows us to study the superconducting transition at fixed disorder and variable carrier concentration. We find that despite structural inhomogeneity on mesoscopic length scales (10-100 nm), this material behaves electronically as a homogenous dirty superconductor. Our simple self-assembly method establishes graphene as an ideal tunable substrate for studying induced two-dimensional electronic systems at fixed disorder and our technique can readily be extended to other order parameters such as magnetism.

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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