The inelastic neutron scattering results and their analysis unequivocally point to a dominant Kitaev interaction in the honeycomb-lattice cobaltate ${\mathrm{BaCo}}_2({\mathrm{AsO}}_4{)}_2$. Our anisotropic-exchange model closely describes all available neutron scattering data in the material’s field-polarized phase. The density-matrix renormalization group results for our model are in close accord with the unusual double-zigzag magnetic order and the low in-plane saturation field of ${\mathrm{BaCo}}_2({\mathrm{AsO}}_4{)}_2$.

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• Antiferromagnetism
• Exchange interaction
• Frustrated magnetism
• Magnetic interactions
• Magnetic order
• Magnetic phase transitions
• Magnetism
• Magnons
• Phase diagrams
• Quantum spin liquid
• Spin liquid
• Spin-orbit coupling
• XY model
• Antiferromagnets
• Insulators
• Magnetic insulators
• Magnetic systems
• Mott insulators
• Noncollinear magnets
• Density matrix methods
• Density matrix renormalization group
• Holstein-Primakoff method
• Inelastic neutron scattering
• Kitaev model
• Kitaev-Heisenberg model
• Linear spin wave theory
• Many-body techniques
• Neutron scattering
• Spin lattice models
• Spin wave theory