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A ballistic quantum ring Josephson interferometer

机译:弹道量子环约瑟夫森干涉仪

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We report the realization of a ballistic Josephson interferometer. The interferometer is made from a quantum ring etched in a nanofabricated two-dimensional electron gas confined in an InAs-based heterostructure laterally contacted to superconducting niobium leads. The Josephson current flowing through the structure shows oscillations with h/e flux periodicity when threading the loop with a perpendicular magnetic field. This periodicity, in sharp contrast with the h/2e one observed in conventional dc superconducting quantum interference devices, confirms the ballistic nature of the device in agreement with theoretical predictions. This system paves the way for the implementation of interferometric Josephson π-junctions, and for the investigation of Majorana fermions.
机译:我们报告了弹道约瑟夫森干涉仪的实现。干涉仪是由量子环制成的,该量子环是在纳米制造的二维电子气中蚀刻而成的,该二维电子气被限制在与超导铌引线横向接触的基于InAs的异质结构中。在垂直磁场中穿入环路时,流过结构的约瑟夫森电流显示出具有h / e通量周期性的振荡。与常规直流超导量子干涉器件中的h / 2e形成鲜明对比的这一周期性证实了该器件的弹道特性与理论预测相符。该系统为实现干涉式约瑟夫森π结和研究马里亚纳费米子铺平了道路。

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