Microwave response of a metallic superconductor subject to a high-voltage gate electrode

Abstract

Processes that lead to the critical-current suppression and change of impedance of a superconductor under the application of an external voltage is an active area of research, especially due to various possible technological applications. In particular, field-effect transistors and radiation detectors have been developed in the recent years, showing the potential for precision and sensitivity exceeding their normal-metal counterparts. In order to describe the phenomenon that leads to the critical-current suppression in metallic superconducting structures, a field-effect hypothesis has been formulated, stating that an electric field can penetrate the metallic superconductor and affect its characteristics. The existence of such an effect would imply the incompleteness of the underlying theory, and hence indicate an important gap in the general comprehension of superconductors. In addition to its theoretical value, a complete understanding of the phenomenon underneath the electric-field response of the superconductor is important in the light of the related technological applications. In this paper, we study the change of the characteristics of a superconductor implementing a coplanar-waveguide resonator as a tank circuit, by relating our measurements to the reactance and resistance of the material. Namely, we track the state of the superconductor at different voltages and resulting leakage currents of a nearby gate electrode which is not galvanically connected to the resonator. By comparing the effects of the leakage current and of a change in the temperature of the system, we conclude that the observed behaviour in the superconductor is [...]

10 pages, 4 figures

References in corpus (9)

• Coplanar Waveguide Resonators for Circuit Quantum Electrodynamics
• Efficient and robust analysis of complex scattering data under noise in microwave resonators
• Number fluctuations of sparse quasiparticles in a superconductor
• Bolometer operating at the threshold for circuit quantum electrodynamics
• Large-format platinum silicide microwave kinetic inductance detectors for optical to near-IR astronomy
• On the origin of the controversial electrostatic field effect in superconductors
• Niobium Dayem nano-bridge Josephson field-effect transistors
• Calculation of Coupling Capacitance in Planar Electrodes
• Interplay between phonon downconversion efficiency, density of states at Fermi energy, and intrinsic energy resolution for microwave kinectic inductance detectors

Cited by in corpus (11)

• On the Role of Out-of-Equilibrium Phonons in Gated Superconducting Switches
• Electrostatic field-driven supercurrent suppression in ionic-gated metallic Josephson nanotransistors
• Gate control of superconducting current: Mechanisms, parameters and technological potential
• Effects of fabrication routes and material parameters on the control of superconducting currents by gate voltage
• Microscopic theory of supercurrent suppression by gate-controlled surface depairing
• Gate-controlled supercurrent effect in dry-etched Dayem bridges of non-centrosymmetric niobium rhenium
• Dynamics of Gate-Controlled Superconducting Dayem Bridges
• Dynamical Hall responses of disordered superconductors
• Multimode operation of a superconducting nanowire switch in the nanosecond regime
• Microwave dynamics of gated Al/InAs superconducting nanowires
• Microscopic mechanism of electric field-induced superconductivity suppression in metallic thin films