Josephson Effect in Coherent Roton Aggregates

TL;DR

This paper predicts a Josephson effect between multiple coherent roton aggregates in superfluid helium, drawing parallels with superconducting Josephson junctions, supported by comparisons with experimental data.

Contribution

It introduces the concept of Josephson effects between coherent roton aggregates in superfluid helium, a novel theoretical prediction.

Findings

Multiple coherent roton aggregates can be excited simultaneously.

A Josephson effect is predicted between these aggregates.

Comparison with experimental data supports the theoretical model.

Abstract

A microwave electromagnetic field can excite a coherent roton aggregate in liquid helium around a dielectric resonator. We show that multiple coherent aggregates are excited simultaneously and predict a Josephson effect between them. The superfluid velocity acts as a "voltage across the weak link" in superconducting Josephson junctions. A comparison with existing experimental data is made.