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Title: Tunneling vortex dynamics in linearly coupled Bose-Hybbard rings
Author: Escrivà, Albert
Muñoz Mateo, Antonio
Guilleumas, Montserrat
Juliá-Díaz, Bruno
Keywords: Vòrtexs
Condensació de Bose-Einstein
Bose-Einstein condensation
Issue Date: 9-Dec-2019
Publisher: American Physical Society
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 a regime, the switch of persistent currents in the rings resembles flux-qubit features and is feasible for experimental realization. On the contrary, strong interatomic interactions suppress the chiral current and lead the system into fragmented condensation.
Note: Reproducció del document publicat a:
It is part of: Physical Review A, 2019, vol. 100, p. 063621
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ISSN: 2469-9926
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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