Production of a dual-species Bose-Einstein condensate of Rb and Cs atoms

TL;DR

This paper demonstrates the simultaneous creation of Bose-Einstein condensates of rubidium and cesium atoms in separate traps, enabling future molecular formation experiments while avoiding interspecies losses.

Contribution

It presents a method for producing dual-species BECs of Rb and Cs with controlled separation to prevent recombination losses, advancing dual-species quantum gas research.

Findings

Successful production of Rb and Cs BECs in separate traps

Characterization of the BEC production process and limitations

Potential for creating ground state molecules via future experiments

Abstract

We report the simultaneous production of Bose-Einstein condensates (BECs) of $^{87}$Rb and $^{133}$Cs atoms in separate optical traps. The two samples are mixed during laser cooling and loading but are separated by $400 \mu$m for the final stage of evaporative cooling. This is done to avoid considerable interspecies three-body recombination, which causes heating and evaporative loss. We characterize the BEC production process, discuss limitations, and outline the use of the dual-species BEC in future experiments to produce rovibronic ground state molecules, including a scheme facilitated by the superfluid-to-Mott-insulator (SF-MI) phase transition.