Rotational Fluxons of Bose-Einstein Condensates in Coplanar Double-Ring Traps

TL;DR

This paper predicts and analyzes rotational fluxons in rotating double-ring Bose-Einstein condensates, highlighting their potential for quantum manipulation and their distinct advantages over solid-state systems.

Contribution

It introduces the concept of rotational fluxons in BECs, detailing conditions for their observation and demonstrating their controllability via external potentials.

Findings

Rotational fluxons can be created and manipulated in double-ring BECs.

Conditions for macroscopic quantum tunneling of fluxons are identified.

Rotational fluxons offer new opportunities for quantum control in cold atom systems.

Abstract

Rotational analogs to magnetic fluxons in conventional Josephson junctions are predicted to emerge in the ground state of rotating tunnel-coupled annular Bose-Einstein condensates (BECs). Such topological condensate-phase structures can be manipulated by external potentials. We determine conditions for observing macroscopic quantum tunneling of a fluxon. Rotational fluxons in double-ring BECs can be created, manipulated, and controlled by external potential in different ways than possible in the solid state system, thus rendering them a promising new candidate system for studying and utilizing quantum properties of collective many-particle degrees of freedom.