Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 2

TT 37.10: Talk

Thursday, March 29, 2012, 12:00–12:15, H 3005

Polaron to molecule transition in strongly interacting Fermi gases — •Tilman Enss and Richard Schmidt — TU München, Germany

A light impurity in a Fermi sea undergoes a transition from a polaron to a molecular bound state for increasing interaction. We develop a new method to compute the spectral functions of the polaron and molecule in a unified framework based on the functional renormalization group with full self-energy feedback. We discuss the energy spectra and decay widths of the attractive and repulsive polaron branches as well as the molecular bound state. The decay follows a characteristic power-law scaling near the transition, showing that the transition is of first order.