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A: Fachverband Atomphysik

A 29: Ultra-cold atoms, ions and BEC (joint session A/Q)

A 29.22: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Multiloop functional renormalization group study of the Fermi polaron problem — •Marcel Gievers — Max Planck Institute for Quantum Optics, Garching, Germany

Imbalanced mixtures of strongly correlated fermions have been investigated both theoretically and experimentally for several decades. A single impurity immersed in a Fermi gas is subject to a transition from a bound molecule of two different fermion species to a so-called Fermi polaron where the impurity forms a quasiparticle with the surrounding fermions. We study the Fermi polaron problem theoretically in three dimensions in an experimentally more realistic setup where there is a finite density of the impurity particles. For this, we apply multi-loop functional renormalization group (mfRG) which is an extension of the conventional functional renormalization group equivalent to the diagrammatic parquet formalism. With this elaborate numerical method, we aim to provide more reliable theoretical predictions such as the lifetime of the polaron.