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Summary
Josephson diodes can be induced by loop current states in both monolayer and bilayer honeycomb systems, breaking time-reversal symmetry. Inversion symmetry can be broken by applying a staggered sublattice potential or modifying the Haldane model in monolayers, and by stacking two layers with opposite current directions or applying an electric field in bilayers.
Highlights
- Josephson diodes can be realized in monolayer and bilayer honeycomb systems with loop current order.
- Breaking inversion symmetry is key to achieving the Josephson diode effect.
- Staggered sublattice potential or modifying the Haldane model can break inversion symmetry in monolayers.
- Bilayers can break inversion symmetry by stacking layers with opposite current directions or applying an electric field.
- The diode effect is robust against disorder induced by impurities.
- The Josephson diode effect can be controlled by the external electric field in bilayers.
- The diode efficiency can be tuned by the interlayer coupling and the strength of the electric field.
Key Insights
- The Josephson diode effect can be achieved in systems with broken time-reversal symmetry, and the loop current states in honeycomb systems provide a promising platform for this phenomenon.
- The symmetry analysis reveals that the armchair JJs do not exhibit the JDE due to the presence of a mirror symmetry that changes the current direction, while the zigzag JJs do exhibit the JDE.
- The bilayer HMs with opposite loop current directions can break the inversion symmetry, leading to the JDE without the need for an external electric field.
- The diode efficiency can be controlled by the interlayer coupling and the strength of the electric field, providing a tunable Josephson diode effect.
- The robustness of the JDE against disorder induced by impurities makes it a promising candidate for practical applications.
- The Josephson diode effect has potential applications in the development of dissipationless electronics and superconducting devices.
- Theoretical models and numerical calculations demonstrate the feasibility of realizing the Josephson diode effect in various systems, paving the way for experimental verification and potential applications.
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Citation
Shen, Q.-K., & Zhang, Y. (2024). Josephson diodes induced by the loop current states (Version 2). arXiv. https://doi.org/10.48550/ARXIV.2409.09938