Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 67: Cold Atomic Gases and Superfluids

TT 67.2: Talk

Thursday, March 19, 2020, 16:45–17:00, HSZ 204

Damping of the Anderson-Bogolyubov mode in Fermi mixtures by spin and mass imbalance — •Piotr Zdybel — Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland

During the speech, we will present the results of a study about the temporally nonlocal contributions to the gradient expansion of the pair fluctuation propagator for spin- and mass-imbalanced Fermi mixtures. These terms are related to damping processes of sound-like (Anderson-Bogolyubov) collective modes and are relevant for the structure of the complex pole of the pair fluctuation propagator. We derive conditions under which damping occurs even at zero temperature for large enough mismatch of the Fermi surfaces. We compare our analytical results with numerically computed damping rates of the Anderson-Bogolyubov mode.

[1] P. Zdybel and P. Jakubczyk, Phys. Rev. A 100, 053622 (2019)