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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Other Theoretical Topics

TT 71.8: Vortrag

Freitag, 20. März 2020, 11:30–11:45, HSZ 304

Dynamical DMFT susceptibility at second orderphase transitions — •Abuduaini Niyazi, Dominique Geffroy, and Jan Kuneš — Institute for Solid State Physics, TU Wien, 1040 Vienna, Austria

We present a dynamical mean-field study (DMFT) of dynamical sus-ceptibility in two-band Hubbard model. By varying model parameters(band asymmetry, crystal field, temperature) we realize transitions between various phases such as triplet excitonic condensate, spin-state order(solid), supersolid or antiferromagnetic solid. We analyze the behavior of relevant dynamical susceptibilities across these transitions, which break either continuous or discrete symmetries. Besides revealing the rich physics of the studied model, our results show how DMFT susceptibilities can be used to identify approximate (weakly broken) symmetries and incipient instabilities.