Yuriy Sizyuk

Importance of anisotropic exchange interactions in honeycomb iridates: Minimal model for zigzag antiferromagnetic order in Na2 IrO3

In this work, we investigate the microscopic nature of the magnetism in honeycomb iridium-based systems by performing a systematic study of how the effective magnetic interactions in these compounds depend on various electronic microscopic parameters. We show that the minimal model describing the magnetism in A

Interplay of many-body and single-particle interactions in iridates and rhodates

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Selection of direction of the ordered moments in Na2IrO3 and α-RuCl3

IrO

Kitaev-Heisenberg model in a magnetic field: Order-by-disorder and commensurate-incommensurate transitions

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Free energy of quantum spin systems: Functional integral representation

includes both isotropic and anisotropic Kitaev-type spin-exchange interactions between nearest and next-nearest neighbor Ir ions, and that the magnitude of the Kitaev interaction between next-nearest neighbor Ir magnetic moments is comparable with nearest neighbor interactions. We also find that, while the Heisenberg and the Kitaev interactions between nearest neighbors are correspondingly antiferro- and ferromagnetic, they both change sign for the next-nearest neighbors. Using classical Monte Carlo simulations we examine the magnetic phase diagram of the derived super-exchange model. Zigzag-type antiferromagnetic order is found to occupy a large part of the phase diagram of the model and, for ferromagnetic next-nearest neighbor Heisenberg interaction relevant for Na

Quantum spin liquid in the semiclassical regime

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Effect of external magnetic field on Kitaev-Heisenberg model

IrO

Erratum: Lifting mean-field degeneracies in anisotropic classical spin systems [Phys. Rev. B 92, 155131 (2015)]

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Order by disorder in Kitaev-Heisenberg models on the honeycomb lattice

, it can be stabilized even in the absence of third nearest neighbor coupling. Our results suggest that a natural physical origin of the zigzag phase experimentally observed in Na

Lifting mean field degeneracies in anisotropic spin systems

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