| Texto completo | |
| Autor(es): |
Daniel Garcia-Orozco, Arnol
[1]
;
Madeira, Lucas
[1]
;
Galantucci, Luca
[2]
;
Barenghi, Carlo F.
[2]
;
Bagnato, Vanderlei S.
[3, 1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, Sao Paulo - Brazil
[2] Newcastle Univ, Joint Quantum Ctr Durham Newcastle, Sch Math Stat & Phys, Newcastle Upon Tyne NE1 7RU, Tyne & Wear - England
[3] Texas A&M Univ, Dept Biomed Engn, College Stn, TX 77843 - USA
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | EPL; v. 130, n. 4 MAY 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
In turbulence phenomena, including the quantum turbulence in superfluids, an energy flux flows from large to small length scales, composing a cascade of energy. A universal characteristic of turbulent flows is the existence of a range of scales where the energy flux is scale-invariant: this interval of scales is often referred to as inertial region. This property is fundamental as, for instance, in turbulence of classical fluids it characterizes the behavior of statistical features such as spectra and structure functions. Here we show that also in decaying quantum turbulence generated in trapped Bose-Einstein condensates (BECs), intervals of momentum space where the energy flux is constant can be identified. Indeed, we present a procedure to measure the energy flux using both the energy spectrum and the continuity equation. A range of scales where the flux is constant is then determined employing two distinct protocols and in the same range, the momentum distribution measured is consistent with previous work. The successful identification of a region with constant flux in turbulent BECs is a manifestation of the universal character of turbulence in these quantum systems. These measurements pave the way for studies of energy conservation and dissipation in trapped atomic superfluids, and also analogies with the related processes that take place in ordinary fluids. (AU) | |
| 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 |
| 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: | 14/50857-8 - INCT 2014 - de Óptica Básica e Aplicada às Ciências da Vida |
| Beneficiário: | Vanderlei Salvador Bagnato |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |