A compact experimental machine for studying tunable Bose-Bose superfluid mixtures

Year: 2019

Authors: Castilho PCM., Pedrozo-Penafiel E., Gutierrez EM., Mazo PL., Roati G., Farias KM., Bagnato VS.

Autors Affiliation: Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP, Brazil; Univ Florence, INO CNR, Via N Carrara 1, I-50019 Sesto Fiorentino, Italy; Univ Florence, LENS, Via N Carrara 1, I-50019 Sesto Fiorentino, Italy; CNRS, Lab Kastler Brossel, Coll France, 11 Pl Marcelin Berthelot, F-75005 Paris, France; MIT, Dept Phys, Harvard Ctr Ultracold Atoms, Cambridge, MA 02139 USA; MIT, Res Lab Elect, Cambridge, MA 02139 USA

Abstract: We present a compact and versatile experimental system for producing Bose-Bose superfluid mixtures composed of sodium and potassium atoms. The compact design combines the necessary ultra-high vacuum enviroment for ultracold atom experiments with efficient atomic fluxes by using two-dimensional magneto-optical traps as independent source of atoms. We demonstrate the performance of this new machine by producing a Bose-Einstein condensate of Na-23 with similar to 1 x 10(6) atoms. The tunability of Na-K bosonic mixtures is particularly interesting for studies regarding the nucleation of vortices and quantum turbulence. In this direction, the large optical access of the science chamber along the vertical direction provides the conditions to implement high resolution optical setups for imaging and rotating the condensate with a stirring beam. We show the nucleation of a vortex lattice with up to 14 vortices in the Na-23 BEC, attesting the efficiency of the experimental apparatus in studying the dynamics of vortices.


Volume: 16 (3)      Pages from: 035501-1  to: 035501-11

More Information: The authors thank RF Shiozaki for developing the experimental control program and V Monteiro and DV Magalhaes for providing experimental support. This work was supported by the financial agencies CNPQ, CAPES and by the Sao Paulo Research Foundation (FAPESP) with the grants #2014/14198-0 and #2013/07276-1 (CEPOF-CEPID Program).
KeyWords: Bose-Einstein condensate; Boson-Boson mixture; superfluid mixture; vortices; vortex lattice; stirring
DOI: 10.1088/1612-202X/ab00fb

Citations: 11
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