Drag-induced dynamical formation of dark solitons in Bose mixture on a ring

TL;DR

This paper demonstrates that Andreev-Bashkin drag can induce dark soliton formation in Bose mixtures on a ring, revealing a novel effect of current-current coupling beyond traditional density interactions.

Contribution

It introduces the concept that current-current coupling causes drag-induced dark solitons, expanding understanding of soliton dynamics in superfluid mixtures.

Findings

Drag-induced dark solitons can be generated by current-current coupling.

Soliton dynamics serve as a tool to study dissipationless drag effects.

Current-current interactions lead to effects not seen with density-density interactions.

Abstract

Andreev-Bashkin drag plays a very important role in multiple areas like superfluid mixtures, superconductors and dense nuclear matter. Here, we point out that the drag phenomenon can be also important in physics of solitons, ubiquitous objects arising in a wide array of fields ranging from tsunami waves and fiber-optic communication to biological systems. So far, fruitful studies were conducted in ultracold atomic systems where nontrivial soliton dynamics occurred due to inter-component density-density interaction. In this work we show that current-current coupling between components (Andreev-Bashkin drag) can lead to a substantially different kind of effects, unsupported by density-density interactions, such as a drag-induced dark soliton generation. This also points out that soliton dynamics can be used as a tool to experimentally study the dissipationless drag effect.