Inverse a-c Josephson effect at terahertz frequencies
The inverse a-c Josephson effect occurs when a Josephson junction driven by a microwave source of frequency f produces constant-voltage steps at integer multiples of hf/2e. For low leakage current, hysteretic junctions driven at microwave frequencies below about 100 GHz, some of these steps can cross the zero dc bias current axis. These zero-crossing steps allow modern-series array-voltage standards to operate without individually biasing the junctions in the array. The authors r-eexamine the theory behind these steps and show that they can exist at frequencies much higher than thought previously; the Riedel singularity in the supercurrent response allows this effect to exist even up to terahertz frequencies. They describe a set of analytical calculations that provide limits on the amount of rounding of the Riedel Peak that can be permitted while still allowing these zero-crossing steps to occur. They also discuss practical considerations such as microwave power levels required and parameters for device fabrication. This analysis is supported by numerical frequency-domain computations and time-domain simulations for a number of realistic I-V curves with rounded Riedel singularities and with quasi-particle subgap leakage currents.
- Research Organization:
- California Univ., Berkeley, CA (USA)
- OSTI ID:
- 5486805
- Report Number(s):
- AD-A-210860/3/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALTERNATING CURRENT
CURRENTS
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
FREQUENCY RANGE
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
JUNCTIONS
MATHEMATICS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
MICROWAVE RADIATION
NUMERICAL ANALYSIS
RADIATIONS
SIMULATION
SQUID DEVICES
STANDARDS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS