Frustrated magnetism in Ising-Kitaev-Gamma model on the triangular lattice

Motivated by the discovery of quantum spin liquid candidate Na₂BaCo(PO₄)₂ and recent field-dependent inelastic neutron scattering study on this material, we theoretically investigate the phase diagram of a frustrated spin-1/2 model on the triangular lattice. Competing antiferromagnetic Ising, bond-dependent exchange (Kitaev) and anisotropic symmetric exchange (Gamma) interactions give rise to a rich phase diagram. Remarkably, aside from various magnetic orders, a gapless quantum spin liquid phase emerges. We present a comprehensive study of the phase diagram, by combining semiclassical method and numerical methods including exact diagonalization and density matrix renormalization group.