Linear AC Response of Diffusive SNS Junctions

Abstract

We explore the behavior of the ac admittance of superconductor-normal metal-superconductor (SNS) junctions as the phase difference of the order parameters between the superconductors is varied. We find three characteristic regimes, defined by comparing the driving frequency $\omega$ to the inelastic scattering rate $\Gamma$ and the Thouless energy $E_T$ of the junction (typically $\hslash \Gamma \ll E_T$). Only in the first regime $\omega \ll \Gamma$ the usual picture of the kinetic inductance holds. We show that the ac admittance can be used to directly access some of the characteristic quantities of the SNS junctions, in particular the phase dependent energy minigap and the typically phase dependent inelastic scattering rate. Our results partially explain the recent measurements of the linear response properties of SNS Superconducting Quantum Interference Devices (SQUIDs) and predict a number of new effects.

6 pages, 7 figures

References in corpus (4)

• Quasiclassical Green's function approach to mesoscopic superconductivity
• Proximity Effect and Multiple Andreev Reflections in Diffusive SNS Junctions
• Theory of Microwave-Assisted Supercurrent in Diffusive SNS Junctions
• Phase sensitive electron-phonon coupling in a superconducting proximity structure

Cited by in corpus (20)

• Frequency-dependent admittance of a short superconducting weak link
• Microwave response of an NS ring coupled to a superconducting resonator
• Dissipation and supercurrent fluctuations in a diffusive NS ring
• Microwave nanobolometer based on proximity Josephson junctions
• Superconductivity in the presence of microwaves: Full phase diagram
• Microwave signature of robust topological Andreev-level crossings in superconducting proximitized crystalline Bi nanowires
• Phase-dependent microwave response of a graphene Josephson junction
• Andreev spectrum with high spin-orbit interactions: revealing spin splitting and topologically protected crossings
• Phase dependent Andreev spectrum in a difusive SNS junction. Static and dynamic current response
• Coherence-enhanced, phase-dependent dissipation in long SNS Josephson junctions: revealing Andreev Bound States dynamics
• Admittance of a long diffusive SNS junction
• Phase-dependent dissipation and supercurrent of a graphene-superconductor ring under microwave irradiation
• Microwave Admittance of Gold-Palladium Nanowires with Proximity-Induced Superconductivity
• Microwave response of a superconductor beyond the Eliashberg theory
• Utilization of the Superconducting Transition for Characterizing Low-Quality-Factor Superconducting Resonators
• Static and dynamic properties of Josephson weak links with singlet and triplet coupling
• ac properties of short Josephson weak links
• Absorption of heat into a superconductor-normal metal-superconductor junction from a fluctuating environment
• Intrinsic dissipation in superconducting junctions probed by qubit spectroscopy
• Determination of the current-phase relation of an InAs 2DEG Josephson junction with a microwave resonator