Excitonic magnet in external field: Complex order parameter and spin currents

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Authors	GEFFROY Dominique Alain HARIKI A. KUNES J.
Year of publication	2018
Type	Article in Periodical
Magazine / Source	Physical Review B
MU Faculty or unit	Faculty of Science
Citation
Web	https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.155114
Doi	http://dx.doi.org/10.1103/PhysRevB.97.155114
Keywords	DMFT; excitonic condensation; strongly correlated electrons
Description	We investigate spin-triplet exciton condensation in the two-orbital Hubbard model close to half-filling 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 lie perpendicular with the applied field and identify exceptions from this rule. For solutions exhibiting k-odd 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.
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