Autoionization of Ultracold Cesium Rydberg Atom in 37D5/2 State

Abstract

We present the observation of an autoionization of cesium 37D5/2 Rydberg atoms in ultracold gases and analyze the autoionization mechanism. The autoionization process is investigated by varying the delay time tD and Rydberg atomic density. The dependence of ionization signals on Rydberg density shows that the Rydberg density has an effect on not only the initial ion signals but also the evolution of the Rydberg atoms. The results reveal that the initial ionization of 37D5/2 Rydberg atoms is mostly attributed to the blackbody radiation (BBR)-induced photoionization, and the BBR-induced transitions to the nearby Rydberg states that lead to further ionization. Our work plays a significant role in investigating the collision between Rydberg atoms and many-body physics.

One-Step Implementation of Collective Anti-Blockade in a Rydberg Ring

“…So far, two methods of Rydberg anti-blockade have been proposed: one is the simultaneous driving [18,19] where a coherent field is suitably detuned to compensate for the (average) Rydberg shift so as to realize collective excitations of all atoms from the ground state to the Rydberg state; another is the sequential driving [20] where a first coherent field resonantly excites one atom to a Rydberg state while a second coherent field excites other atoms to the same state by compensating for the (average) Rydberg shift with a suitable detuning. There have been extensive studies on the realization and application of the Rydberg anti-blockade for atomic pairs or ensembles [21][22][23][24][25][26][27][28][29][30][31], while little attention has been paid to regularly arranged finite atoms, e.g., in a ring or a square optical lattice.…”