Time-connected phase slips in current-driven two-band superconducting wires

TL;DR

This paper investigates how time-connected phase slips occur in current-driven two-band superconducting wires, revealing their topological structure and conditions for observation, which impacts understanding dissipation in such systems.

Contribution

It introduces the concept of time-connected phase slips with a detailed topological structure in two-band superconductors under current drive.

Findings

Time-connected phase slips involve two phase slips separated in time.

Voltage vs. time exhibits a two-peak structure during t-PS.

Observation depends on interband coupling and relaxation times.

Abstract

We study quasi-one dimensional wires of two-band superconductors driven by an electrical current. We find that the onset of dissipation can occur with the nucleation of time-connected phase slips (t-PS). The topological structure of the t-PS consists of two phase slips (one in each order parameter) separated in time and connected via an interband vortex string along the time direction. This shows as a two-peak structure in voltage vs. time. We discuss the conditions for observing t-PS, depending on the interband coupling strength and the relaxation time scales for each order parameter.