Cooling of trapped ions by resonant charge exchange

Abstract

The two most widely used ion cooling methods are laser cooling and sympathetic cooling by elastic collisions (ECs). Here we demonstrate another method of cooling ions that is based on resonant charge exchange (RCE) between the trapped ion and the ultracold parent atom. Specifically, trapped Cs${}^{+}$ ions are cooled by collisions with co-trapped, ultracold Cs atoms and, separately, by collisions with co-trapped, ultracold Rb atoms. We observe that the cooling of Cs${}^{+}$ ions by Cs atoms is more efficient than cooling of Cs${}^{+}$ ions by Rb atoms. This signals the presence of a cooling mechanism apart from the elastic ion-atom collision channel for the Cs-Cs${}^{+}$ case, which is cooling by RCE. The efficiency of cooling by RCE is experimentally determined and the per-collision cooling is found to be two orders of magnitude higher than cooling by EC. The result provides the experimental basis for future studies on charge transport by electron hopping in atom-ion hybrid systems.

7 pages, 5 figures

References in corpus (12)

• A trapped single ion inside a Bose-Einstein condensate
• Power-Law Distributions for a Trapped Ion Interacting with a Classical Buffer Gas
• Controlling chemical reactions of a single particle
• Quantum theory of ultracold atom-ion collisions
• Dynamics of a ground-state cooled ion colliding with ultra-cold atoms
• Energy scaling of cold atom-atom-ion three-body recombination
• Kinetics of a single trapped ion in an ultracold buffer gas
• Buffer-gas cooling of a single ion in a multipole radio frequency trap beyond the critical mass ratio
• Charge-exchange collisions between ultracold fermionic lithium atoms and calcium ions
• Collisional cooling of light ions by co-trapped heavy atoms
• Dynamics of a single trapped ion immersed in a buffer gas
• Non-destructive detection of ions using atom-cavity collective strong coupling

Cited by in corpus (14)

• Cold hybrid ion-atom systems
• Transport of a single cold ion immersed in a Bose-Einstein condensate
• Inelastic collision dynamics of a single cold ion immersed in a Bose-Einstein condensate
• Direct observation of swap cooling in atom-ion collisions
• Charge dynamics of a molecular ion immersed in a Rydberg-dressed atomic lattice gas
• Tayloring Bose-Einstein condensate environments for a Rydberg impurity
• Strong angular-momentum mixing in ultracold atom-ion excitation-exchange
• Ion loss events in a cold Rb-Ca${}^{+}$ hybrid trap: photodissociation, black-body radiation and non-radiative charge exchange
• Interaction potentials and ultracold scattering cross sections for the ${}^7$Li${}^{+}$-${}^7$Li ion-atom system
• Measurement of charge-exchange between Na and \ce{Ca+} in a hybrid trap
• In situ observation of chemistry in Rydberg molecules within a coherent solvent
• Fermi polaron in atom-ion hybrid systems
• Ab initio electronic structure of the Sr${}_2^{+}$ molecular ion
• A versatile apparatus for simultaneous trapping of multiple species of ultracold atoms and ions to enable studies of low energy collisions and cold chemistry