Shapiro Step on the rc-Branch in the IV-characteristic of a Josephson Junction with an LC-shunting

TL;DR

This paper investigates how external radiation influences Josephson junctions with LC shunting, revealing new resonant features and altered Shapiro step behaviors that could enhance technological applications.

Contribution

It demonstrates the emergence of rc-branches in the IV-characteristics and how Shapiro step widths depend on amplitude when on these branches, a novel insight into junction dynamics.

Findings

Resonant rc-branches appear at Josephson frequency.

Shapiro step width behavior changes on rc-branches.

Potential for improved Josephson junction technologies.

Abstract

The effect of external radiation on the phase dynamics of Josephson junctions shunted by an LC circuit is examined. It is shown that additional resonant circuit (rc) branches appear in the current voltage characteristics of the junctions when the Josephson frequency is equal to the frequency of the formed resonance circuit. We show that the amplitude dependence of the Shapiro step width crucially changes when the Shapiro step is on the rc-branch in comparison to the case of Josephson junction without shunt. The experimental implementation of these effects might give very important advantages for existing methods and technologies.