Parametric Excitation of a Bose-Einstein Condensate: From Faraday Waves to Granulation

Autor(es)

Nguyen, V, J. H. ; Tsatsos, M. C. ^[1] ; Luo, D. ^[2] ; Lode, A. U. J. ^{[3, 4, 5]} ; Telles, G. D. ^[1] ; Bagnato, V. S. ^[1] ; Hulet, R. G. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Phys Sao Carlos, POB 369, BR-13560970 Sao Carlos, SP - Brazil

^[2] Nguyen, J. H., V, Rice Univ, Dept Phys & Astron, Houston, TX 77005 - USA

^[3] Univ Vienna, Fac Math, Wolfgang Pauli Inst, Oskar Morgenstern Pl 1, A-1090 Vienna - Austria

^[4] TU Wien, Vienna Ctr Quantum Sci & Technol, Atominst, Stadionallee 2, A-1020 Vienna - Austria

^[5] Univ Basel, Dept Phys, Klingelbergstr 82, CH-4056 Basel - Switzerland

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW X; v. 9, n. 1 MAR 25 2019.
• Citações Web of Science: 11

Resumo

We explore, both experimentally and theoretically, the response of an elongated Bose-Einstein condensate to modulated interactions. We identify two distinct regimes differing in modulation frequency and modulation strength. Longitudinal surface waves are generated either resonantly or parametrically for modulation frequencies near the radial trap frequency or twice the trap frequency, respectively. The dispersion of these waves, the latter being a Faraday wave, is well reproduced by a mean-field theory that accounts for the 3D nature of the elongated condensate. In contrast, in the regime of lower modulation frequencies, we find that no clear resonances occur, but with an increased modulation strength, the condensate forms an irregular granulated distribution that is outside the scope of a mean-field approach. We find that the granulated condensate is characterized by large quantum fluctuations and correlations, which are well described with single-shot simulations obtained from wave functions computed by a beyondmean-field theory at zero temperature, the multiconfigurational time-dependent Hartree for bosons method. (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