Superfluid excitations in rotating two-dimensional ring traps

Autor(es)

Tomishiyo, Guilherme ; Madeira, Lucas ; Caracanhas, Monica A.

• Tipo de documento: Artigo Científico
• Fonte: Physics of Fluids; v. 36, n. 6, p. 18-pg., 2024-06-01.

Resumo

We studied a rotating Bose-Einstein condensate confined in ring trap configurations that can be produced starting with a bubble trap confinement, approximated by a Mexican hat and shift harmonic oscillator potentials. Using a variational technique and perturbation theory, we determined the vortex configurations in this system by varying the interparticle interaction and the angular velocity of the atomic cloud. We found that the phase diagram of the system has macrovortex structures for small positive values of the interaction parameter, and the charge of the central vortex increases with rotation. Strengthening the atomic interaction makes the macrovortex unstable, and it decays into multiple singly charged vortices that arrange themselves in a lattice configuration. We also look for experimentally realizable methods to determine the vortex configuration without relying upon absorption imaging since the structures are not always visible in the latter. More specifically, we study how the vortex distribution affects the collective modes of the condensate by solving the Gross-Pitaevskii equation numerically and by analytical predictions using the sum-rule approach for the frequencies of the modes. These results reveal important signatures to characterize the macrovortices and vortex lattice transitions in the experiments. (AU)

• Processo FAPESP: 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 23/04451-9 - Computação de alto desempenho aplicada em fluidos quânticos
• Beneficiário: Lucas Madeira
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 18/09191-7 - Vórtices e turbulência em fluidos quânticos fortemente interagentes e suas misturas
• Beneficiário: Lucas Madeira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado