Josephson Diode Effect in Andreev Molecules

Abstract

We propose a new platform for observing the Josephson diode effect: the Andreev molecule. This nonlocal electronic state is hosted in circuits made of two closely spaced Josephson junctions, through the hybridization of the Andreev states. The Josephson diode effect occurs at the level of one individual junction while the other one generates the required time-reversal and spatial-inversion symmetry breaking. We present a microscopic description of this phenomenon based on fermionic Andreev states, focusing on single channels in the short limit, and we compute both supercurrent and energy spectra. We demonstrate that the diode efficiency can be tuned by magnetic flux and the junctions transmissions, and can reach $45\%$. Going further, by analyzing the Andreev spectra, we demonstrate the key role played by the continuum, which consists of leaky Andreev states and is largely responsible for the critical current asymmetry. On top of proposing an experimentally accessible platform, this work elucidates the microscopic origin of the Josephson diode effect at the level of the fermionic Andreev states.

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Cited by in corpus (26)

• Field-free Josephson diode effect in altermagnet/normal metal/altermagnet junctions
• Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction
• Tuning the Josephson diode response with an ac current
• Phase-dependent Andreev molecules and superconducting gap closing in coherently coupled Josephson junctions
• Engineering of anomalous Josephson effect in coherently coupled Josephson junctions
• Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
• Strong nonlocal tuning of the current-phase relation of a quantum dot based Andreev molecule
• From nonreciprocal to charge-4e supercurrents in Ge-based Josephson devices with tunable harmonic content
• Theory of universal diode effect in three-terminal Josephson junctions
• Field-free Josephson diode effect in interacting chiral quantum dot junctions
• On-off switch and sign change for non-local Josephson diode in spin-valve Andreev molecules
• Design of a Josephson diode based on double magnetic impurities
• Magnetointerferometry of multiterminal Josephson junctions
• Josephson junctions based on ultraclean carbon nanotubes
• Nonlocal Josephson diode effect in minimal Kitaev chains
• Ballistic Andreev interferometers
• Fermionic Quantum Simulation on Andreev Bound State Superlattices
• Josephson diode effect in nanowire-based Andreev molecules
• Side-gate modulation of supercurrent in InSb nanoflag-based Josephson junctions
• Interplay between evanescent scattering modes and finite dispersion in superconducting junctions
• Superconducting Diode Effect in Double Quantum Dot Device
• Andreev molecules at distance
• Slave-spin approach to the Anderson-Josephson quantum dot
• Towards a $\cos (2\phi )$ Josephson element using aluminum junctions with well-transmitted channels
• Revisiting the adiabatic limit in ballistic multiterminal Josephson junctions
• Giant and robust Josephson diode effect in multiband topological nanowires