论文标题
多末端约瑟夫森连接中电导模式的选择性控制
Selective Control of Conductance Modes in Multi-terminal Josephson Junctions
论文作者
论文摘要
多末端约瑟夫森连接的Andreev结合状态光谱形成了人造带的结构，该结构预测在某些条件下会托管可调拓扑阶段。但是，多末端约瑟夫森连接的终端之间的电导模式的数量必须很少，以便可以在实验上访问该频谱。在这项工作中，我们在三端的约瑟夫森设备中采用了量子点接触几何形状。我们证明了对每对端子之间的电导模式的独立控制，并与存在超导耦合并存的单模式访问。这些结果建立了一个完整的平台，以实现多末端约瑟夫森连接处的可调式Andreev绑定状态光谱。
The Andreev bound state spectra of multi-terminal Josephson junctions form an artificial band structure, which is predicted to host tunable topological phases under certain conditions. However, the number of conductance modes between the terminals of multi-terminal Josephson junction must be few in order for this spectrum to be experimentally accessible. In this work we employ a quantum point contact geometry in three-terminal Josephson devices. We demonstrate independent control of conductance modes between each pair of terminals and access to the single-mode regime coexistent with the presence of superconducting coupling. These results establish a full platform on which to realize tunable Andreev bound state spectra in multi-terminal Josephson junctions.
