SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 30: Highly Charged Ions and their Applications II

A 30.1: Invited Talk

Friday, March 10, 2023, 14:30–15:00, F107

Stability and Melting Dynamics of Mixed Species Coulomb Crystals with Highly Charged Ions — •Luca Rüffert¹, Elwin Dijck², Tanja Mehlstäubler¹, and José Crespo² — ¹Bundesallee 100, 38116 Braunschweig — ²Saupfercheckweg 1, 69117 Heidelberg

Coulomb Crystals of various ionic species confined by a Paul trap are being used in a variety of different applications spanning from high precision spectroscopy to quantum information processing. In particular, multi-ion atomic clocks could offer increased precision and mixed crystals with highly charged ions enable the use of quantum logic operations. Pick up of electric field noise and insufficient cooling can cause those crystals to heat up and affect the systems stability in a negative way to the point of angular or radial melting. Investigating the melting dynamics of mixed species crystals aids in finding robust operating parameters to mitigate heating effects.

In collaboration between PTB Braunschweig and MPIK we are using highly charged ions implanted in Be+ ion crystals of various sizes to analyze the effects of those highly charged ions (HiCIs) on the structural stability of ion coulomb crystals (ICCs). By running Monte Carlo simulations and directly compare them to the experiment, our goal is to show how the inclusion of HiCIs inside an ICC can enhance the stability and therefore increase the melting temperature of those systems. In addition varying the charge state of the highly charged ion allows to investigate the effect of differing charge-to-mass ratios. I will present the current state of our research and discuss the different criterions for the melting of ICCs.