Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.44: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Spin currents and triplet exciton condensate in magnetic field — •Dominique Geffroy1,2, Atsushi Hariki2, and Jan Kuneš2,3 — 1Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kolářská 2, 611 37 Brno, Czech Republic — 2Institute of Solid State Physics, TU Wien, Wiedner Hauptstr . 8, 1020 Vienna, Austria — 3Institute of Physics, the Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czech Republic
We investigate spin-triplet exciton condensation in the two-orbital Hubbard model by means of dynamical mean-field theory. Employing an impurity solver that handles complex off-diagonal hybridization functions, we study the behavior of excitonic condensate in stoichiometric and doped systems subject to external magnetic field. We find a general tendency of the triplet order parameter to lay perpendicular to the applied field and identify exceptions from this rule. For solutions exhibiting odd-k spin textures, we discuss the Bloch theorem which, in the absence of spin-orbit coupling, forbids the appearance of spontaneous net spin current. We demonstrate that the Bloch theorem is not obeyed by the dynamical mean-field theory.