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

## TL;DR

This paper introduces a compact, versatile experimental system for creating and studying tunable Bose-Bose superfluid mixtures of sodium and potassium, enabling advanced investigations into vortex nucleation and quantum turbulence.

## Contribution

The paper presents a novel, compact experimental setup that efficiently produces sodium-potassium Bose-Bose mixtures and demonstrates vortex lattice formation in sodium Bose-Einstein condensates.

## Key findings

- Successful production of a sodium BEC with ~1 million atoms.
- Observation of vortex lattice with up to 14 vortices.
- The system's large optical access facilitates high-resolution imaging and manipulation.

## 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 $^{23}$Na with $\sim 1 \times 10^{6}~$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 $^{23}$Na BEC, attesting the efficiency of the experimental apparatus in studying the dynamics of vortices.