Graziano Gino V, Gupta Mohit, Pendharkar Mihir, Dong Jason T, Dempsey Connor P, Palmstrøm Chris, Pribiag Vlad S
School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA.
Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA, 93106, USA.
Nat Commun. 2022 Oct 8;13(1):5933. doi: 10.1038/s41467-022-33682-2.
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 a 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 to 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.
多端约瑟夫森结的安德列夫束缚态谱形成一种人工能带结构，预计在某些条件下会呈现出可调控的拓扑相。然而，为了使该谱在实验上可获取，多端约瑟夫森结各端之间的电导模式数量必须很少。在这项工作中，我们在三端约瑟夫森器件中采用量子点接触几何结构，以展示对每对端之间电导模式的独立控制，并实现与超导耦合共存的单模状态。这些结果建立了一个完整的平台，可用于在多端约瑟夫森结中实现可调控的安德列夫束缚态谱。
