Josephson diode based on conventional superconductors and a chiral quantum dot

Abstract

We propose theoretically a Josephson diode consisting of the conventional superconductors with the plain s-wave pairing and a chiral quantum dot. When an external magnetic field is exerted on the quantum dot, the critical current of the Josephson structure is different for the opposite directions of current flow. The strong nonreciprocity can be obtained in a large area of the parameter space. The inversion and the on/off state of the nonreciprocity can be conveniently regulated by adjusting the direction of the external field. The dependences of the nonreciprocal behaviors on the the hopping amplitude, the magnitude of the magnetic field and the energy level of the quantum dot are investigated in details using the Keldysh nonequilibrium Green's function formalism under the self-consistent procedure. The symmetric and the antisymmetric properties of the nonreciprocity are analyzed from symmetries satisfied by the superconductors. The proposed diode effect also applies to other chiral conductors as interlayer. Its formation has no restriction on the type of the current-phase difference relations. The generality and flexibility of our proposed diode effect provides more possibilities for the design of the dissipationless diode devices.

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• Field-free Josephson diode effect in altermagnet/normal metal/altermagnet junctions
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• Gate-tunable Josephson diode effect in Rashba spin-orbit coupled quantum dot junctions
• Universal spin superconducting diode effect from spin-orbit coupling
• Design of Josephson diode based on magnetic impurity
• Tunneling Magnetoresistance Effect in Altermagnets
• Nonreciprocal charge transport and subharmonic structure in voltage-biased Josephson diodes
• Engineered Josephson diode effect in kinked Rashba nanochannels
• Field-free Josephson diode effect in interacting chiral quantum dot junctions
• Quasiparticles-mediated thermal diode effect in Weyl Josephson junctions
• Harnessing the superconducting diode effect through inhomogeneous magnetic fields
• Unconventional Josephson supercurrent diode effect induced by chiral spin-orbit coupling
• Tunable Josephson diode effect in singlet superconductor-altermagnet-triplet superconductor junctions
• Design of a Josephson diode based on double magnetic impurities
• Supercurrent Diode Effect in Josephson Interferometers with Multiband Superconductors
• Non-Hermitian superconducting diode effect
• Floquet-engineered diode performance in a Majorana-quantum dot Josephson junction
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• Andreev bound state spectroscopy of a quantum-dot-based Aharonov-Bohm interferometer with superconducting terminals
• Superconducting Diode Effect in Double Quantum Dot Device
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• Helimagnetic Josephson diode effect
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• Giant and robust Josephson diode effect in multiband topological nanowires