Nonlocal superconducting quantum interference device

Abstract

Superconducting quantum interference devices (SQUIDs) that incorporate two superconductor/insulator/superconductor (SIS) Josephson junctions in a closed loop form the core of some of the most sensitive detectors of magnetic and electric fields currently available. SQUIDs in these applications are typically operated with a finite voltage which generates microwave radiation through the ac Josephson effect. This radiation may impact the system being measured. We describe here a SQUID in which the Josephson junctions are formed from strips of normal metal (N) in good electrical contact with the superconductor (S). Such SNS SQUIDs can be operated under a finite voltage bias with performance comparable or potentially better than conventional SIS SQUIDs. However, they also permit a novel mode of operation that is based on the unusual interplay of quasiparticle currents and supercurrents in the normal metal of the Josephson junction. The new method allows measurements of the flux dependence of the critical current of the SNS SQUID without applying a finite voltage bias across the SNS junction, enabling sensitive flux detection without generating microwave radiation.

References in corpus (15)

• The Josephson critical current in a long mesoscopic S-N-S junction
• Dispersive magnetometry with a quantum limited SQUID parametric amplifier
• Novel Circuit Theory of Andreev Reflection
• Persistent currents in normal metal rings
• Distribution functions in non-equilibrium theory of superconductivity and Andreev spectroscopy in unconventional superconductors
• Diffusive conductors as Andreev interferometers
• SQUIPT - Superconducting Quantum Interference Proximity Transistor
• Proximity DC squids in the long junction limit
• Density of states and supercurrent in diffusive SNS junctions: role of nonideal interfaces and spin-flip scattering
• Proximity effect between two superconductors spatially resolved by scanning tunneling spectroscopy
• Thermoelectric effects in superconducting proximity structures
• Nonequilibrium transport in mesoscopic multi-terminal SNS Josephson junctions
• Interplay between Josephson and Aharonov-Bohm effects in Andreev interferometers
• Nonlocal correlations in a proximity-coupled normal metal
• Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction

Cited by in corpus (4)

• Vortex matter in a two-band SQUID-shaped superconducting film
• Tunable Majorana corner states driven by superconducting phase bias in a vertical Josephson junction
• Probing the topological band structure of diffusive multiterminal Josephson junction devices with conductance measurements
• Tuning the the fundamental periodicity of the current-phase relation in multiterminal diffusive Josephson junctions