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arXiv · 2104.06895

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

Maciej Pylak·Filip Gampel·Marcin Płodzień·Mariusz Gajda
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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.

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Maciej Pylak, Filip Gampel, Marcin Płodzień, Mariusz Gajda. 2021-04-14. Manifestation of relative phase in dynamics of two interacting Bose-Bose droplets. https://doi.org/10.1103/physrevresearch.4.013168

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