Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Ultra-cold atoms, ions and BEC I (joint session A/Q)

Q 16.3: Talk

Monday, March 10, 2025, 17:45–18:00, KlHS Mathe

Polaron spectroscopy of many-body systems — •Ivan Amelio — Université Libre de Bruxelles, Brussels, Belgium

When an impurity is immersed in a many-body background, it is dressed by the excitations of the bath, and forms "a polaron".

As a result, the injection spectrum of the impurity carries the hallmarks of the correlations present in the bath. This physics is relevant for excitons optically injected in a few layer heterostructure, or for cold atomic mixtures.

In this talk, we will first review the basic theoretical framework and recent experimental progress.

Then, we will theoretically analyze a few cases of correlated many-body states: the impurity injection spectra are predicted to display peculiar features, that allow to distinguish whether the bath features BCS pairing, charge density waves, topological phases, the BKT transition, etc.

Keywords: Polarons; Fermi superfluids; BKT transition; Correlated systems