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Ziv Meir

Weizmann Institute of Science (Israele)

Wednesday, September 7th, 2016 at 12:00:00 PM

LENS

Published on-line at 08:22:19 AM on Monday, September 5th, 2016

Dynamics of a single, ground-state cooled and trapped ion colliding with ultracold atoms: A micromotion tale

Understanding atom-ion collision dynamics is at the heart of the growing field of ultracold atom-ion physics.

Understanding atom-ion collision dynamics is at the heart of the growing field of ultracold atom-ion physics. In our system, we overlap a ground-state cooled 88Sr+ ion with ultracold 87Rb atoms. We measure the ion’s energy distribution using narrow optical clock spectroscopy after few collisions and using Doppler re-cooling thermometry in steady-state. Despite the fact that both species start at μK temperatures, we observe the heating of the ion to mK temperatures after few collisions. We also observe a deviation in the energy distribution from Maxwell-Boltzmann characterized by an exponential tail to one with power-law tail described by Tsallis function. These phenomena are explained by the intrinsic nature of the ion Paul trap which consist of oscillating electric fields. Despite the fact that our system is eventually driven out of the ultracold regime, we are capable of studying ultra-cold physics by limiting the interaction to the first collision. 

In this talk I will review this work (https://arxiv.org/abs/1603.01810v2) and also new experiments involving in-elastic process such as spin-exchange, charge-exchange and quenching.

For further informations, please contact Prof. Carlo Sias.