Binary Dipolar Condensates of Dysprosium Isotopes with Tunable Spatial Order

Abstract

Dipolar quantum mixtures provide a unique route to interaction-driven many-body phases, where long-range anisotropic interactions intertwine the density, spin and spatial order. Here we realize binary Bose--Einstein condensates of the highly magnetic isotopes $^{162}$Dy and $^{164}$Dy in a technically minimal, single-species-like apparatus. Their nearly identical single-particle properties yield naturally matched trapping potentials, while dense intra- and inter-species Feshbach spectra provide strong interaction tunability. We use this platform to drive an interaction-controlled miscibility transition of a dipolar binary condensate, accompanied by a reconfiguration of the condensate interface from core--shell-like to side-by-side and exchanged core--shell-like geometries. At fixed interactions, population imbalance provides a second control knob by reshaping the effective mean-field pressures and continuously tuning the phase-separated order. These results establish dysprosium isotope mixtures as a compact platform for engineering miscibility, interfaces, and spatial order in dipolar quantum matter, with direct connections to coupled density--spin physics and binary supersolidity.