Influence of strong microwave radiation on static properties of a small Josephson junction

TL;DR

This paper investigates how strong microwave radiation affects the static electrical properties of a small Josephson junction, using experimental methods and theoretical models to analyze its behavior under various conditions.

Contribution

It introduces an experimental approach to measure microwave current amplitude and examines the limitations of the Stewart-McCumber model under external magnetic fields.

Findings

Microwave power influences the junction's static characteristics.

External magnetic fields alter junction dynamics beyond the Stewart-McCumber model.

Experimental methods effectively determine microwave current amplitude.

Abstract

Preliminary results are presented concerning static properties of a small Josephson junction under the influence of strong microwave radiation. We discuss the correspondence between a Brownian particle moving in a periodic potential and superconducting phase difference in a small Josephson junction. Next, we describe an experimental method of determining the amplitude of microwave current flowing across the junction. Typical examples of static characteristics of the junction are presented, including its dynamical resistance as a function of microwave power. We discuss also the influence of an external magnetic field on the junction dynamics and show that in this case the one-dimensional Stewart-McCumber model becomes insufficient.