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arXiv 1012.4394cond-mat.mes-hallcond-mat.supr-con
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二维电子气中邻近诱导超导的量子点谱

Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas

Fabio Deon, Vittorio Pellegrini, Francesco Giazotto, Giorgio Biasiol, Lucia Sorba, Fabio Beltram

摘要:

我们报道了一个混合超导体-量子点器件的实现从InGaAs/InAlAs半导体异质结构中的二维电子气开始,通过自顶向下的纳米结构。量子点由放置在平面Nb-InGaAs量子阱-Nb结的正常区域内的静电栅极限定。在强库仑阻塞以及共隧穿光谱制度的测量允许直接探测的邻近诱导的能隙的弹道二维电子气耦合到超导体。

英文摘要:

We report the realization of a hybrid superconductor-quantum dot device by means of top-down nanofabrication starting from a two dimensional electron gas in a InGaAs/InAlAs semiconductor heterostructure. The quantum dot is defined by electrostatic gates placed within the normal region of a planar Nb-InGaAs quantum well-Nb junction. Measurements in the regime of strong Coulomb blockade as well as cotunneling spectroscopy allow to directly probe the proximity-induced energy gap in a ballistic two-dimensional electron gas coupled to superconductors.

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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