Phase Dynamics in Intrinsic Josephson Junctions and its Electrodynamics

TL;DR

This paper provides a theoretical framework for understanding phase dynamics in intrinsic Josephson junctions, revealing how different states affect plasma coupling and electromagnetic radiation, with implications for terahertz device applications.

Contribution

It introduces a classification of dynamic states in Josephson junctions based on phase structure and demonstrates how these states influence plasma oscillations and radiation.

Findings

State with kink enhances plasma coupling and radiation.

State without kink exhibits weak plasma oscillations.

Numerical simulations confirm theoretical predictions.

Abstract

We present a theoretical description of the phase dynamics and its corresponding electrodynamics in a stack of inductively coupled intrinsic Josephson junctions of layered high-$T_c$ superconductors in the absence of an external magnetic field. Depending on the spatial structure of the gauge invariant phase difference, the dynamic state is classified into: state with kink, state without kink, and state with solitons. It is revealed that in the state with phase kink, the plasma is coupled to the cavity and the plasma oscillation is enhanced. In contrast, in the state without kink, the plasma oscillation is weak. It points a way to enhance the radiation of electromagnetic from high-$T_c$ superconductors. We also perform numerical simulations to check the theory and a good agreement is achieved. The radiation pattern of the state with and without kink is calculated, which may serve as a fingerprint of the dynamic state realized by the system. At last, the power radiation of the state with solitons is calculated by simulations. The possible state realized in the recent experiments is discussed in the viewpoint of the theoretical description. The state with kink is important for applications including terahertz generators and amplifiers.