Kölzer Jonas, Jalil Abdur Rehman, Rosenbach Daniel, Arndt Lisa, Mussler Gregor, Schüffelgen Peter, Grützmacher Detlev, Lüth Hans, Schäpers Thomas
Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52425 Jülich, Germany.
JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, 52425 Jülich, Germany.
Nanomaterials (Basel). 2023 Jan 10;13(2):293. doi: 10.3390/nano13020293.
In this paper, in an in situ prepared three-terminal Josephson junction based on the topological insulator Bi4Te3 and the superconductor Nb the transport properties are studied. The differential resistance maps as a function of two bias currents reveal extended areas of Josephson supercurrent, including coupling effects between adjacent superconducting electrodes. The observed dynamics for the coupling of the junctions is interpreted using a numerical simulation of a similar geometry based on a resistively and capacitively shunted Josephson junction model. The temperature dependency indicates that the device behaves similar to prior experiments with single Josephson junctions comprising topological insulators' weak links. Irradiating radio frequencies to the junction, we find a spectrum of integer Shapiro steps and an additional fractional step, which is interpreted with a skewed current-phase relationship. In a perpendicular magnetic field, we observe Fraunhofer-like interference patterns in the switching currents.
在本文中，对基于拓扑绝缘体Bi4Te3和超导体Nb原位制备的三端约瑟夫森结的输运特性进行了研究。作为两个偏置电流函数的微分电阻图揭示了约瑟夫森超电流的扩展区域，包括相邻超导电极之间的耦合效应。使用基于电阻和电容并联约瑟夫森结模型的类似几何结构的数值模拟来解释观察到的结耦合动力学。温度依赖性表明该器件的行为类似于先前包含拓扑绝缘体弱链接的单个约瑟夫森结的实验。向结施加射频辐射，我们发现了一系列整数夏皮罗台阶和一个额外的分数台阶，这可以用倾斜的电流-相位关系来解释。在垂直磁场中，我们在开关电流中观察到类似夫琅禾费的干涉图案。
