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New experimental system to study coupled vortices in a two-species Bose-Einstein condensate 23Na-41K with tunable interactions

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Author(s):
Patricia Christina Marques Castilho
Total Authors: 1
Document type: Doctoral Thesis
Press: São Carlos.
Institution: Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT)
Defense date:
Examining board members:
Vanderlei Salvador Bagnato; Emanuel Alves de Lima Henn; Paulo Alberto Nussenzveig; Giacomo Roati; Sandra Sampaio Vianna
Advisor: Vanderlei Salvador Bagnato
Abstract

Two-component fluids can be miscible (if they overlap in space) or immiscible (if they remain phase-separated). In the context of trapped two-species Bose-Einstein condensates (BECs), these miscibility regions can only be fully characterize if one considers the interspecies interaction, the mass ratio and the number of atoms in each species. The dynamics of coupled vortices is different for each miscibility region and exotic vortices configurations (such as, square vortex lattices, \"vortex sheets\", skyrmions, etc.) are expected to occur. In this thesis, we present the construction of a new experimental system able to produce a two-species Bose-Einstein condensate of 23Na-41K atoms with tunable interspecies interactions and study the dynamics of coupled vortices in the different miscibility regimes. The BEC of sodium atoms obtained first in a Plug trap and later, in a crossed optical dipole trap, is fully characterized as well as the cold atomic cloud of potassium atoms produced by means of a Gray molasses cooling procedure. In the crossed optical dipole trap, the vortices will be nucleated with the use of a stirring beam. Therefore, in the end of this thesis, we present the stirring beam setup and its characterization prior aligning it into the 23Na BEC. (AU)

FAPESP's process: 14/14198-0 - Quantum turbulence in a two species Bose-Einstein Condensate 23Na-41K with tunable interactions
Grantee:Patrícia Christina Marques Castilho
Support Opportunities: Scholarships in Brazil - Doctorate