论文标题
石墨烯约瑟夫森连接的零偏置和特殊的夏皮罗地图
Zero-bias crossings and peculiar Shapiro maps in graphene Josephson junctions
论文作者
论文摘要
AC Josephson效应以约瑟夫森连接中量化电压的“ shapiro步骤”的形式表现出来。这种效果提出了一个驱动驱动量子现象的早期例子，目前在原始电压标准标准中使用。 Shapiro Steps也已成为探测各种新型材料制造的连接处的标准工具之一。在这里，我们研究了夏皮罗（Shapiro）的步骤，以广泛的基于石墨烯的约瑟夫森（Josephson）连接。我们研究了在这个充分理解的系统中可以根据载体密度，温度，RF频率和磁场获得的多种模式。尽管当只有一个参数变化时，Shapiro步骤的模式可能会发生巨大变化，但是可以理解总体趋势，并且行为直接模拟。由此产生的理解可能有助于解释更复杂的材料中的类似测量。
The AC Josephson effect manifests itself in the form of "Shapiro steps" of quantized voltage in Josephson junctions subject to RF radiation. This effect presents an early example of a driven-dissipative quantum phenomenon and is presently utilized in primary voltage standards. Shapiro steps have also become one of the standard tools to probe junctions made in a variety of novel materials. Here, we study Shapiro steps in a widely tunable graphene-based Josephson junction. We investigate the variety of patterns that can be obtained in this well-understood system depending on the carrier density, temperature, RF frequency, and magnetic field. Although the patterns of Shapiro steps can change drastically when just one parameter is varied, the overall trends can be understood and the behaviors straightforwardly simulated. The resulting understanding may help in interpreting similar measurements in more complex materials.
