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arXiv 1809.09376cond-mat.mes-hall
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石墨烯纳米器件与大能隙超导体耦合的隧道谱研究

Tunneling spectroscopy of graphene nanodevices coupled to large-gap superconductors

Joel I-Jan Wang, Landry Bretheau, Daniel Rodan-Legrain, Riccardo Pisoni, Kenji Watanabe, Takashi Taniguchi, Pablo Jarillo-Herrero

摘要:

我们进行了耦合到铌/氮化三铝超导电极的石墨烯的隧道光谱测量。由于邻近效应,石墨烯的态密度取决于超导体之间的相位差,并在零相位处表现出硬诱导能隙,与Andreev束缚态的连续体一致。在大于超导能隙的能量下,我们观察到了显示库仑阻塞效应的相位相关能级,这被解释为来自伪量子点,推测是嵌入异质结构中并耦合到邻近石墨烯。

英文摘要:

We performed tunneling spectroscopy measurements of graphene coupled to niobium/niobium-nitride superconducting electrodes. Due to the proximity effect, the graphene density of states depends on the phase difference between the superconductors and exhibits a hard induced gap at zero phase, consistent with a continuum of Andreev bound states. At energies larger than the superconducting gap, we observed phase-dependent energy levels displaying the Coulomb blockade effect, which are interpreted as arising from spurious quantum dots, presumably embedded in the heterostructures and coupled to the proximitized graphene.

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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