Topological phases of higher Chern numbers in Kitaev–Heisenberg ferromagnet with further-neighbor interactions. (10th June 2019)

• Record Type: Journal Article
• Authors: Deb, Moumita; Kumar Ghosh, Asim
• Is Part Of: Journal of physics. Volume 31:Number 34(2019)
• Publication Date: 2019-06-10
• Subjects: Kitaev–Heisenberg ferromagnet -- Chern number -- topological properties -- thermal Hall conductance -- edge states -- Kitaev spin liquids -- topological phase transition; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ab22ef
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Emergence of multiple topological phases with a series of Chern numbers, 1, 1, 2, 2, 3 and 4, is found in a ferromagnetic Kitaev–Heisenberg-spin-anisotropic model on honeycomb lattice with next-next-nearest-neighbor interactions in the presence of an external magnetic field. Magnon Chern insulating dispersions of this two-band model are studied by using linear spin-wave theory formulated on the exact ferromagnetic ground state. Magnon edge states are obtained for the respective topological phases along with density of states. A topological phase diagram of this model is presented. Behavior of thermal Hall conductivity for those phases is studied. Sharp jumps of thermal hall conductivity is noted near the vicinity of phase transition points. Topological phases of the Kitaev spin-liquid compounds, -RuCl3, X2 IrO3, X = (Na, Li) and CrY3, Y = (Cl, Br, I) are characterized based on this theoretical findings.