Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 54: Fe-based Superconductors

TT 54.2: Talk

Thursday, March 19, 2020, 09:45–10:00, HSZ 201

DMFT study of Hund’s metals: the charge response of Fe-based superconductors — •Alexander Kowalski — Institut für Theoretische Physik und Astrophysik, Universität Würzburg

We investigate various multi-orbital Hubbard models for iron-based superconductors, from a five-orbital Wannier-based Hamiltonian of BaFe2As2 down to simpler three- and two-orbital descriptions. These systems have previously been analyzed using techniques such as slave-spin mean field [1], which have shown the existence of a Hund-driven strongly-correlated phase close in doping to the half-filled Mott transition. Our DMFT calculations using a continuous-time quantum Monte Carlo solver for one- and two-particle quantities [2] reveal the presence of regions of phase separation with diverging charge compressibility.

[1] L. de’ Medici, Phys. Rev. Lett 118, 167003 (2017)

[2] M. Wallerberger, A. Hausoel, P. Gunacker, A. Kowalski, N. Parragh, F. Goth, K. Held, G. Sangiovanni, Comput. Phys. Commun. 235, 388 (2019)