Analogues of Josephson junctions and black hole event horizons in atomic Bose-Einstein condensates

TL;DR

This paper explores analogies between Josephson junctions and black hole event horizons in atomic Bose-Einstein condensates, revealing conditions for their observation and potential for studying quantum Hawking radiation analogues.

Contribution

It introduces theoretical analysis of Josephson effects and acoustic horizons in BECs, highlighting new conditions for observing these phenomena and their implications for quantum gravity analogues.

Findings

Robust multicharged persistent currents in toroidal BECs.

Numerical evidence of acoustic event horizons in superflows.

Potential to study Hawking radiation analogues experimentally.

Abstract

We study dynamical processes in coherently coupled atomic Bose-Einstein condensates. Josephson effects in ring-shaped and dumbbell geometries are theoretically investigated. Conditions for observation of the Josephson effect are revealed. We found that multicharged persistent current in toroidal condensate can be robust even for supersonic atomic flow. In numerical simulations the acoustic analogues of event horizon in quantized superflow was observed. These theoretical finding open perspectives for investigation of Bose Josephson junctions and quantum aspects of acoustic analogue of Hawking radiation in existing experimental setups.