Topological magnons in ferromagnetic Kitaev-Heisenberg model on CaVO lattice

TL;DR

This paper explores the emergence of topological magnon phases in a ferromagnetic Kitaev-Heisenberg model on the CaVO lattice, analyzing their properties, phase transitions, and thermal Hall effects.

Contribution

It introduces a comprehensive analysis of topological magnon phases considering various interactions and anisotropies in the Kitaev-Heisenberg model on the CaVO lattice, including phase diagrams and topological transitions.

Findings

Multiple topological magnon phases identified with distinct Chern numbers.

Topological phase transitions mapped in the parameter space.

Thermal Hall conductance varies across different phases.

Abstract

A number of topological phases are found to emerge in the ferromagnetic Kitaev-Heisenberg model on CaVO lattice in the presence of Dzyaloshinskii-Moriya interaction. Heisenberg and Kitaev terms have been considered on nearest and next-nearest neighbor bonds in a variety of ways. Both isotropic and anisotropic couplings are taken into account. Topological phases are characterized by Chern numbers for the distinct magnon bands as well as the number of modes for topologically protected gapless magnon edge states. Band structure, dispersion relation along the high-symmetric points of first Brillouin zone, density of states and thermal Hall conductance have been evaluated for every phase. An extensive Phase diagram has been constructed. Topological phase transition in the parameter space is also studied.