We report on half-integer Shapiro steps observed in a gate-tunable short ballistic InAs nanowire Josephson junction. We observed the Shapiro steps of the short ballistic InAs nanowire Josephson junction and found the half-integer steps in addition to the conventional integer steps. In this Josephson junction device the junction transmission can be varied with gate voltage. From measurements of the gate voltage and temperature dependences of the Shapiro steps, the origin of half-integer steps is assigned to the skewness of the current phase relation in the short ballistic Josephson junctions. These results will contribute to establish and control the superconductivity physics in the short ballistic semiconductor nanowires.

中文翻译：

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半整数Shapiro步骤的证据源自短弹道InAs纳米线约瑟夫森结中的非正弦电流相位关系

我们报告在门可调短弹道InAs纳米线约瑟夫森结中观察到的半整数Shapiro步骤。我们观察到短弹道InAs纳米线约瑟夫森结的Shapiro台阶，并发现了除常规整数台阶之外的半整数台阶。在该约瑟夫森结器件中，结传输可以随栅极电压而变化。通过测量Shapiro阶梯的栅极电压和温度相关性，半整数阶梯的起源被分配给短弹道约瑟夫森结中电流相位关系的偏斜度。这些结果将有助于建立和控制短弹道半导体纳米线中的超导物理学。