Liu Jung-Ching, Pawlak Rémy, Wang Xing, Chen Hongyan, D'Astolfo Philipp, Drechsel Carl, Zhou Ping, Häner Robert, Decurtins Silvio, Aschauer Ulrich, Liu Shi-Xia, Wulfhekel Wulf, Meyer Ernst
Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.
Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern 3012, Switzerland.
ACS Mater Lett. 2023 Mar 8;5(4):1083-1090. doi: 10.1021/acsmaterialslett.2c00955. eCollection 2023 Apr 3.
Obtaining a robust superconducting state in atomically precise nanographene (NG) structures by proximity to a superconductor could foster the discovery of topological superconductivity in graphene. On-surface synthesis of such NGs has been achieved on noble metals and metal oxides; however, it is still absent on superconductors. Here, we present a synthetic method to induce superconductivity of polymeric chains and NGs adsorbed on the superconducting Nb(110) substrate covered by thin Ag films. Using atomic force microscopy at low temperature, we characterize the chemical structure of each subproduct formed on the superconducting Ag layer. Scanning tunneling spectroscopy further allows us to elucidate the electronic properties of these nanostructures, which consistently show a superconducting gap.
通过与超导体接近，在原子精确的纳米石墨烯（NG）结构中获得稳健的超导态，可能会促进石墨烯中拓扑超导性的发现。这种纳米石墨烯的表面合成已在贵金属和金属氧化物上实现；然而，在超导体上仍然缺乏。在这里，我们提出了一种合成方法，以诱导吸附在覆盖有薄银膜的超导铌（110）衬底上的聚合物链和纳米石墨烯的超导性。利用低温原子力显微镜，我们表征了在超导银层上形成的每个副产物的化学结构。扫描隧道谱进一步使我们能够阐明这些纳米结构的电子特性，这些特性始终显示出超导能隙。
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