Triplon thermal Hall response in a honeycomb-lattice $J_1$-$J_2$ Heisenberg antiferromagnet with Dzyaloshinskii--Moriya interactions
We investigate triplon topology and the thermal Hall transport in a columnar valence-bond solid of a spin-$1/2$ honeycomb-lattice $J_1$-$J_2$ Heisenberg antiferromagnet. Inequivalent triangular sublattices, modeled by $J_2^A\neq J_2^B$, remove inversion symmetry at nearest-neighbor bond centers and allow in-plane Dzyal...