The Centre of New Technologies, University of Warsaw invites to a seminar by
Prof. Michał Tomza
Title: Quantum control of ultracold chemical reactions
Date: 1st of December 2023, Friday
Time: 12:00 pm (Central European Time)
Host: Silvio Osella, PhD
The seminar will be in the CeNT aula hall (00.142) on the main floor.
Abstract:
I will present our recent results of ab initio electronic structure and multichannel scattering calculations proposing, guiding, and explaining ultracold quantum physics experiments. I will start with our efforts related to hybrid systems of laser-cooled trapped ions and ultracold atoms combined in a single experimental setup. In collaboration with experimental groups in Amsterdam and in Freiburg, we reached and explained the quantum regime of ion-atom collisions manifested via shape resonances and their quantum control with an external magnetic field observed with magnetic Feshbach resonances . Giant second-order spin-orbit coupling is responsible for measured Feshbach resonances. I will conclude with explaining the mechanism of recently observed magnetic Feshbach resonances in ultracold atom-molecule mixtures. In collaboration with groups at MIT and in Nijmegen, we showed that these Feshbach resonances result from spin rotation and spin-spin couplings in combination with the anisotropic atom-molecule interaction. If time allows, I will tease the audience with our ongoing calculations explaining unprecedented state-to-state fully quantum-resolved measurements of ultracold atom-molecule chemical reactions performed at Harvard, where we found that tiny spin-rotation coupling enhanced at a conical intersection is crucial.
