Magnetic phases for strongly correlatedt2g4electrons on the square lattice: Impact of spin-orbit coupling and crystal field,Physical Review B

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Magnetic phases for strongly correlatedt2g4electrons on the square lattice: Impact of spin-orbit coupling and crystal field
Physical Review B ( IF 3.2 ) Pub Date : 2021-09-23 , DOI: 10.1103/physrevb.104.115148
Pascal Strobel ₁ , Friedemann Aust ₁ , Maria Daghofer _{1,

2}

Affiliation

We investigate two holes in the

t_{2 g}

levels of a square-lattice Mott insulator with strong spin-orbit coupling. Exact diagonalization of a spin-orbital model, with arbitrary spin-orbit coupling and crystal field (valid for strong onsite interactions) is complemented by an effective triplon model (valid for strong spin-orbit coupling) and by a semiclassical Monte Carlo variant of the model. We provide the magnetic phase diagram depending on crystal field and spin-orbit coupling, which largely agrees for the semiclassical Monte Carlo and quantum models, as well as excitation spectra characterizing the various phases.

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