Spin-orbital liquids in non-Kramers magnet on Kagome lattice

Abstract

Localized magnetic moments with crystal-field doublet or pseudo-spin 1/2 may arise in correlated insulators with even number of electrons and strong spin-orbit coupling. Such a non-Kramers pseudo-spin 1/2 is the consequence of crystalline symmetries as opposed to the Kramers doublet arising from time-reversal invariance, and is necessarily a composite of spin and orbital degrees of freedom. We investigate possible spin-orbital liquids with fermionic spinons for such non-Kramers pseudo-spin 1/2 systems on the Kagome lattice. Using the projective symmetry group analysis, we find {\it ten} new phases that are not allowed in the corresponding Kramers systems. These new phases are allowed due to unusual action of the time reversal operation on non-Kramers pseudo-spins. We compute the spin-spin dynamic structure factor that shows characteristic features of these non-Kramers spin-orbital liquids arising from their unusual coupling to neutrons, which is therefore relevant for neutron scattering experiments. We also point out possible anomalous broadening of Raman scattering intensity that may serve as a signature experimental feature for gapless non-Kramers spin-orbital liquids.

11 pages, 4 figures

References in corpus (5)

• Generic quantum spin ice
• Hastatic Order in URu2Si2
• Quantum Phase Transition in Heisenberg-Kitaev Model
• A Proposal to Use Neutron Scattering to Measure Scalar Spin Chirality Fluctuations in Kagome Lattices
• Chiral RKKY interaction in Pr2Ir2O7

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• Structural and magnetic properties of two branches of the Tripod Kagome Lattice family A${}_2$RE${}_3$Sb${}_3$O${}_{14}$ (A = Mg, Zn; RE = Pr, Nd, Gd, Tb, Dy, Ho, Er, Yb)
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• Classification of spin liquids on the square lattice with strong spin-orbit coupling
• Non-Kitaev spin liquids in Kitaev materials
• Phases and Quantum Phase Transitions in an Anisotropic Ferromagnetic Kitaev-Heisenberg-$\Gamma$ Magnet
• Incommensurate magnetic order in Sm${}_3$BWO${}_9$ with the distorted kagome lattice
• New quantum number for the many-electron Dirac-Coulomb Hamiltonian
• Topological spinon bands and vison excitations in spin-orbit coupled quantum spin liquids
• Quantum Spin Liquids in Pyrochlore Magnets With Non-Kramers Local Moments
• Field-induced phases in a heavy-fermion U(Ru${}_{0.92}$Rh${}_{0.08}$)${}_2$Si${}_2$ single crystal