Polar Radical Sources for Quantum Simulation: Moving Trap Zeeman Deceleration and Photostop

Dr. David Carty (Durham University)
Event Date and Time: 
Fri, 2012-09-14 16:00 - 17:30
Chem D-215
Local Contact: 
Taka Momose
Intended Audience: 

In a remarkable paper from 2006, Peter Zoller (Micheli et al., Nat. Phys, 2, 341) showed that polar radicals arranged in optical lattices can be used to systematically engineer many-body Hamiltonians of spin lattice models that can used to understand the properties of exotic materials. In this talk, which will consist of two main parts, I will present the current status of two experiments situated in Durham designed to produce trapped cold polar radicals that can be further cooled to microKelvin temperatures by sympathetic cooling with laser cooled atoms in a microwave trap.


In the first part of the talk, I will present the latest results of an experiment that we call "photostop" (Mol. Phys. 109, 725 (2011) & PCCP, 13, 8441 (2011)) showing that we can bring to rest SH radicals in a permanent magnet trap by photodissociating H2S molecules in a molecular beam. I will also compare the data to the results of Monte Carlo simulations, which we subsequently use to predict the densities of molecules that can be trapped.


In the second part of the talk, I will present the results of Monte Carlo simulations of a new type of Zeeman decelerator (currently under construction) that is designed to be highly efficient (ca. 35%). The design (based on that of Trimeche et al., Eur. Phys. J., 65, 263 (2011)) uses current-carrying coils wound to produce a 2 m array of overlapping magnetic traps that can be decelerated very smoothly from the initial velocity of a molecular beam to rest.

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