Two dynamic exponents in the resistive transition of fully frustrated Josephson-junction arrays

TL;DR

This study investigates the resistive transition in fully frustrated Josephson-junction arrays, revealing that phase and chiral variables exhibit different dynamic exponents despite sharing the same critical temperature, indicating complex critical dynamics.

Contribution

It demonstrates the presence of two distinct dynamic exponents in the resistive transition, challenging the single transition scenario in fully frustrated Josephson-junction arrays.

Findings

Phase and chiral variables share the same critical temperature.

Different dynamic exponents are observed for phase coherence and chiral order.

Results support complex critical dynamics in the system.

Abstract

We study the resistive transition in Josephson-junction arrays at $f=1/2$ flux quantum per plaquette by dynamical simulations of the resistively-shunted-junction model. The current-voltage scaling and critical dynamics of the phases are found to be well described by the same critical temperature and static exponents as for the chiral (vortex-lattice) transition. Although this behavior is consistent with a single transition scenario, where phase and chiral variables order simultaneously, two different dynamic exponents result for phase coherence and chiral order.