Antiferromagnetic magnons and local anisotropy: Dynamical mean-field study

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Authors	NIYAZI Abuduaini GEFFROY Dominique Alain KUNEŠ Jan
Year of publication	2021
Type	Article in Periodical
Magazine / Source	Physical Review B
MU Faculty or unit	Faculty of Science
Citation
web	https://doi.org/10.1103/PhysRevB.104.075152
Doi	https://doi.org/10.1103/PhysRevB.104.075152
Keywords	Hubbard model; Spin dynamics; Antiferromagnets; Green's function methods; Magnetic order
Description	We present a dynamical mean-field study of antiferromagnetic magnons in a one-, two-, and three-orbital Hubbard model of square and bcc cubic lattice at intermediate coupling strength. We investigate the effect of anisotropy introduced by an external magnetic field or single-ion anisotropy. For the latter we tune continuously between the easy-axis and easy-plane models. We also analyze a model with spin-orbit coupling in cubic site-symmetry setting. The ordered states as well as the magnetic excitations are sensitive to even a small breaking of SU(2) symmetry of the model and follow the expectations of spin-wave theory as well as general symmetry considerations.
Related projects:	Frustrované a nefrustrované spinové systémy s měkkými spiny v relativistických Mottových izolantech