arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.01373cond-mat.mes-hallcond-mat.supr-con
收藏

多端约瑟夫森结电导模的选择性控制

Selective Control of Conductance Modes in Multi-terminal Josephson Junctions

Gino V. Graziano, Mohit Gupta, Mihir Pendharkar, Jason T. Dong, Connor P. Dempsey, Chris Palmstrøm, Vlad S. Pribiag

摘要:

多终端约瑟夫森结的Andreev束缚态谱形成人工能带结构,该能带结构被预测在一定条件下具有可调拓扑相位。然而,多终端约瑟夫森结的终端之间的电导模式的数量必须是少数,为了使这个频谱是实验上可访问的。在这项工作中,我们采用量子点接触几何的三端约瑟夫森器件。我们展示了独立控制的电导模式之间的每对终端和访问的单模制度共存的超导耦合的存在。这些结果为实现多终端约瑟夫森结中可调谐Andreev束缚态谱提供了一个完整的平台。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑