(SEMINAR) Prof. Michał Tomza, Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Poland

event date: 1 December 2023

The Centre of New Technologies, University of Warsaw invites to a seminar by

Prof. Michał Tomza

Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Poland

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.


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.