Tunneling vortex dynamics in linearly coupled Bose-Hubbard rings
Abstract
The quantum dynamics of population-balanced fractional vortices and population-imbalanced vortices in an effective two-state bosonic system, made of two coupled discrete circuits with few sites, is addressed within the Bose-Hubbard model. % We show that for low on-site interaction, the tunneling of quantized vortices between the rings performs a coherent, oscillating dynamics connecting current states with chiral symmetry. The vortex-flux transfer dually follows the usual sinusoidal particle current of the Josephson effect, in good agreement with a mean-field approximation. Within such regime, the switch of persistent currents in the rings resembles flux-qubit features, and is feasible to experimental realization. On the contrary, strong interatomic interactions suppress the chiral current and lead the system into fragmented condensation.
Keywords
Cite
@article{arxiv.1908.01353,
title = {Tunneling vortex dynamics in linearly coupled Bose-Hubbard rings},
author = {Albert Escrivà and Antonio Muñoz Mateo and Montserrat Guilleumas and Bruno Juliá-Díaz},
journal= {arXiv preprint arXiv:1908.01353},
year = {2020}
}
Comments
10 pages, 6 figures. Matches the published version