Efficient Josephson diode effect on a two-dimensional topological insulator with asymmetric magnetization

J. Wang; Y. Jiang; Juan Juan Wang; Jun-Feng Liu

doi:10.1103/PhysRevB.109.075412

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Efficient Josephson diode effect on a two-dimensional topological insulator with asymmetric magnetization

J. Wang, Y. Jiang, Juan Juan Wang, Jun-Feng Liu

DOI 10.1103/PhysRevB.109.075412 · Physical Review B

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Abstract

The Josephson diode effect (JDE) is a nonreciprocal transport phenomenon in which, the oppositely flowing critical currents are asymmetric and has great potential for applications in superconducting electronic devices. In this study, we present a theoretical investigation of the JDE on the two helical edge states of a two-dimensional topological insulator with asymmetric magnetization on each edge. It is shown that for a single-edge Josephson junction, the optimal JDE efficiency is approximately 35%, but for a double-edged Josephson junction with appropriate asymmetric magnetization on two edges, the JDE efficiency can be enhanced to around 68%. The origin of this enhancement lies in the fact that the two individual magnetizations not only can independently affect the asymmetric critical currents of the single-edge Josephson junction but also can shift the current-phase relation of the junction.