Ultracold neutral plasmas formed by photoionizing laser-cooled atoms near the ionization
threshold have electron temperatures in the 1–1000K range and ion temperatures from tens …

We review experimental and theoretical tools to excite, study and understand strongly
interacting Rydberg gases. The focus lies on the excitation of dense ultracold atomic …

We review here the studies performed about interactions in an assembly of cold Rydberg
atoms. We focus especially on the review of the dipole–dipole interactions and on the effect …

By photoionizing samples of laser-cooled atoms with laser light tuned just above the
ionization limit, plasmas can be created with electron and ion temperatures below 10 K …

We show that the probability distributions for the number of Rydberg excitations in small
ensembles of cold atoms, excited using short (100 ns) laser pulses, can be highly sub …

We use perturbation theory to directly calculate the van der Waals and dipole-dipole energy
shifts of pairs of interacting Rb Rydberg atoms for different quantum numbers n, ℓ, j, and mj …

Laser cooling of a neutral plasma is a challenging task because of the high temperatures
typically associated with the plasma state. By using an ultracold neutral plasma created by …

We propose a scheme to directly laser cool Rydberg atoms by laser cooling the residual ion
core within the Rydberg-electron orbit. The scheme is detailed for alkaline-earth-metal …

We have observed resonant energy transfer between cold Rydberg atoms in spatially
separated cylinders. Resonant dipole-dipole coupling excites the 49 s atoms in one cylinder …

We present time-resolved spectroscopic measurements of Rydberg-Rydberg interactions
between two Rydberg atoms in an ultracold gas, revealing the pair dynamics induced by …