Abstracts

Towards a new class of trapped ion experiments with ion rings

Presenting Author: Erik Urban, Häffner group, (UC Berkeley)
Contributing Author(s): Hao-Kun Li, Crystal Noel, Boerge Hemmerling, Hartmut Haeffner

We present the design and implementation of a novel surface ion trap allowing for trapping of ions in a ring configuration. A ring topology introduces a number of new features that are not present in conventional, linear ion traps, such as extremely low trap frequencies, periodic boundary conditions, and the ability to rotate. These new features open the possibility to conduct a new class of experiments previously inaccessible to ion traps. Towards this goal, we trap up to 25 ions 400 μm above the plane of a trap surface in a ring geometry with a diameter of 90 μm. The large trapping height relative to the ion-ion spacing gives us the the ability to control electric fields at the trapping point with only a few compensation electrodes. This control allows us to pin the ions either into a localized crystal on one side of the ring or to fully delocalize them over the full extent of the ring, demonstrating any symmetry breaking in our ring is on energy scales below the Doppler limit of 0.5 mK. We present studies of the trap frequencies in a pinned configuration and its transition to a depinned, rotating state.

(Session 8 : Friday from 2:45 pm - 3:15 pm)

 

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