Manifestation of relative phase in dynamics of two interacting Bose-Bose droplets

TL;DR

This paper investigates the complex dynamics of two interacting Bose-Bose droplets, revealing how their relative phases influence collision scenarios and phase-dependent interactions through an extended Gross-Pitaevskii framework.

Contribution

It introduces a phase-dependent interaction potential and double Josephson-junction equations to explain droplet collision dynamics and phase evolution.

Findings

Demonstrates phase coupling affects collision outcomes

Identifies spontaneous symmetry breaking in droplet dynamics

Mentions nondissipative drag (Andreev-Bashkin effect)

Abstract

We study coherent dynamics of two interacting Bose-Bose droplets by means of the extended Gross-Pitaevskii equation. The relative motion of the droplets couples to the phases of their components. The dynamics can be understood in terms of the evolution of zero-energy modes recovering symmetries spontaneously broken by the mean-field solution. These are translational symmetry and two U(1) symmetries, associated with the phases of the droplets' two components. A phase-dependent interaction potential and double Josephson-junction equations are introduced to explain the observed variety of different scenarios of collision. We show that the evolution of the droplets is a macroscopic manifestation of the hidden dynamics of their phases. The occurrence of nondissipative drag between the two supercurrents (Andreev-Bashkin effect) is mentioned.