Hydrodynamic studies of atomic fluids in quantum regime

• Ano de defesa: 2021
• Autor(a) principal: Gutierrez, Emmanuel David Mercado
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Perda de três corpos; Rede de Vortices; Three-body losses; Vortex lattice; Vortices
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/76/76134/tde-22122021-090702/

In this thesis, we produce a Bose-Einstein condensate of sodium atoms in a magnetic plugged trap and in an optical dipole trap. First, we investigate the critical velocity by moving an obstacle through the condensate, comparing the result obtained with the the sound velocity. We make use of the critical velocity value to determine the rigth parameters to stir the condensate and nucleate quantized vortices, by introducing angular with the rotation of the srirring beam the number of vortices increases linearly until the rigid-body limit. In the second part we introduce potassium atom in the science chamber where from the begining of the MOT stage are observed ligth induced losses. In a single-specie operation we are able to cool down the potassium atoms by implementing the gray molasses technique, increasing its phase-space density in order have a good tranference efficienty to the magnetic trap. We also present the the sympathetic cooling of the K atoms due by elastic collision between the atomic species.