Vortex Dynamics in Binary Superfluids

Quantum mixtures formed of ultracold atoms provide an extremely clean and well-controlled system for studies of the cooperative behavior inherent in superfluidity and subsequent superfluid dynamics, with exquisite control over interactions, geometry, and rotation (vorticity). In particular, experimental control of interspecies interactions has enabled recent demonstrations of beyond-mean-field phenomena such as quantum droplets and Lee-Huang-Yang gases. Quantised vortices, topologically-protected defects, are ideal probes of the cooperative behaviour inherent in superfluid systems, as their nucleation, internal structure, and dynamics depend directly on the microscopic physics at play. Furthermore, vortices play an integral role in the dissipation of energy in these systems. I will discuss how vortices may be used to probe binary superfluids and quantum-fluctuation-enhanced regimes, and how this might be implemented experimentally. I will present an overview of the experimental capabilities under development at the University of Strathclyde to enable studies of vortex dynamics in binary superfluids.