Nonadiabatic dynamics in Rydberg gases with random atom positions

Assemblies of highly excited Rydberg atoms in an ultracold gas can be set into motion by a combination van der Waals and resonant dipole-dipole interactions. Thereby, the collective electronic state might change due to nonadiabatic transitions, particular if configuration encounters conical intersection. For experimentally most accessible scenario, which are initially randomly three-dimensional bulk under blockade conditions, we numerically show that transitions common when starting from energetic repulsive Born-Oppenheimer surface. We outline how this selectively using microwave resonance, demonstrate regime where almost all collisional ionization traced back prior transition. Since is relatively straightforward detect, excitation measurement scheme considered here renders effects easier than scenarios previously.