Interfering Josephson diode effect in Ta2Pd3Te5 asymmetric edge interferometer

Abstract

Edge states in topological systems have attracted great interest due to their robustness and linear dispersions. Here a superconducting-proximitized edge interferometer is engineered on a topological insulator Ta2Pd3Te5 with asymmetric edges to realize the interfering Josephson diode effect (JDE), which hosts many advantages, such as the high efficiency as much as 73% at tiny applied magnetic fields with an ultra-low switching power around picowatt. As an important element to induce such JDE, the second-order harmonic in the current-phase relation is also experimentally confirmed by half-integer Shapiro steps. The interfering JDE is also accompanied by the antisymmetric second harmonic transport, which indicates the corresponding asymmetry in the interferometer, as well as the polarity of JDE. This edge interferometer offers an effective method to enhance the performance of JDE, and boosts great potential applications for future superconducting quantum devices.

arXiv comment31 pages,16 figures

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Cited by in corpus (6)

• Superconducting Diode Effects: Mechanisms, Materials and Applications
• Non-Hermitian superconducting diode effect
• Diode effect in Shapiro steps in an asymmetric SQUID with a superconducting nanobridge
• Josephson diode effect in nanowire-based Andreev molecules
• Unveiling Topological Hinge States in the Higher-Order Topological Insulator WTe${}_2$ Based on the Fractional Josephson Effect
• Pressure induced magnetic-field-free superconducting diode effect in NbSe2 flake