Dual-species Bose-Einstein condensate of 41K and 87Rb in a hybrid trap

TL;DR

This paper demonstrates the creation of a dual-species Bose-Einstein condensate of 41K and 87Rb using a hybrid trap, highlighting sympathetic cooling and immiscibility in the quantum mixture.

Contribution

It reports the first production of a 41K-87Rb dual-species BEC in a hybrid trap with tunable populations and observed immiscibility.

Findings

Produced over 10^5 atoms in the condensate

Achieved sympathetic cooling of 41K by 87Rb

Observed immiscibility through density profiles

Abstract

We report on the production of a 41K-87Rb dual-species Bose-Einstein condensate in a hybrid trap, consisting of a magnetic quadrupole and an optical dipole potential. After loading both atomic species in the trap, we cool down 87Rb first by magnetic and then by optical evaporation, while 41K is sympathetically cooled by elastic collisions with 87Rb. We eventually produce two-component condensates with more than 10^5 atoms and tunable species population imbalance. We observe the immiscibility of the quantum mixture by measuring the density profile of each species after releasing them from the trap.