Streamline controlled rectification of supercurrent in thin-film asymmetric weak links

Abstract

In this study, we examined the supercurrent diode effect (SDE) in mesoscopic superconducting weak links formed by asymmetric Dayem bridges. These planar metallic constrictions, which naturally exhibit Josephsonlike behavior, offer a fundamental platform for investigating nonreciprocal transport phenomena in a regime where the bridge width aligns with the superconducting coherence length. The foundational concept is inspired by the Tesla valve, a classical fluidic device that achieves flow rectification through interference and turbulence between fluid streams enabled by geometric asymmetry. Analogously, we demonstrate that spatial asymmetry within superconducting structures can result in rectification due to the polarity-dependent interaction between transport and screening currents. By implementing controlled geometric defects at the junction between the constriction and superconducting leads, we induce current crowding and disrupt spatial inversion symmetry, thus facilitating directional switching behavior. Experimental results indicate a linear-in-field rectification regime at low magnetic fields, driven by the interaction between transport and screening currents, which is succeeded by complex vortex dynamics within the superconducting banks at elevated fields. Time-dependent Ginzburg-Landau simulations replicate significant features of the experimental observations and substantiate the influence of both screening currents and rearrangements of Abrikosov vortices. A comparative study across various geometries highlights the crucial role of defect shape and spatial confinement in determining the rectification efficiency, revealing a minimum threshold in bridge width below which crowding-induced SDE is significantly reduced. Our findings advocate for mesoscopic Dayem bridges as a flexible platform for designing and controlling superconducting diode functionalities.

References in corpus (23)

• Zero-field superconducting diode effect in small-twist-angle trilayer graphene
• Ubiquitous Superconducting Diode Effect in Superconductor Thin Films
• The Josephson diode effect in supercurrent interferometers
• Field-free superconducting diode effect in noncentrosymmetric superconductor/ferromagnet multilayers
• Josephson Diode Effect in High Mobility InSb Nanoflags
• Demonstration of a superconducting diode-with-memory, operational at zero magnetic field with switchable nonreciprocity
• Critical-Current Reduction in Thin Superconducting Wires Due to Current Crowding
• Non-reciprocity of Vortex-limited Critical Current in Conventional Superconducting Micro-bridges
• Magnetic Proximity-Induced Superconducting Diode Effect and Infinite Magnetoresistance in van der Waals Heterostructure
• Sign reversal of the AC and DC supercurrent diode effect and 0-$\pi$-like transitions in ballistic Josephson junctions
• A gate- and flux-controlled supercurrent diode
• Sign reversal diode effect in superconducting Dayem nanobridges
• The supercurrent diode effect and nonreciprocal paraconductivity due to the chiral structure of nanotubes
• pyTDGL: Time-dependent Ginzburg-Landau in Python
• Superconducting Diode Effects: Mechanisms, Materials and Applications
• Josephson diode effect in monolithic dc-SQUIDs based on 3D Dayem nanobridges
• Supercurrent rectification with time-reversal symmetry broken multiband superconductors
• Double loop dc-SQUID as a tunable Josephson diode
• Tuning critical field, critical current, and diode effect of narrow thin-film superconductors through engineering inhomogeneous Pearl length
• Probing confined vortices with a superconducting nanobridge
• Supercurrent Diode Effect in Josephson Interferometers with Multiband Superconductors
• Biharmonic-Drive Tunable Josephson Diode
• Quasi-ideal feedback-loop supercurrent diode