Seminarium Optyczne

An impurity immersed in a quantum environment can be viewed as a fundamental building blockfor many-body problems and give insight into the transport properties of different materials.Ultracold atoms provide here an excellent playground, allowing for precise control of experimentalconditions and reaching a wide regime of system parameters. An intriguing possibility is to makeuse of charged impurities such as atomic ions, which interact more strongly with the backgroundgas. In a recent experiment, a single low energy ion has been created inside a Bose-Einsteincondensate. Using a precisely tuned electric field pulse, its subsequent collisional dynamics subjectto an external force has been studied. Comparison of the measurements with stochastic trajectorysimulations based on sequential Langevin collisions indicates diffusive transport properties of theimpurity and allows to extract its mobility. In a fraction of events, molecular ion formation viathree-body recombination can occur. The experimental setup allows to study the subsequentchemical dynamics of the produced molecule, which undergoes vibrationally inelastic collisionswith the host gas.

seminarium z użyciem połączenia internetowegohttps://zoom.us/j/97696726563(meeting ID: ID 97696726563, password: 314297)