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PreprintCC BY 4.0arXiv

Triplon thermal Hall response in a honeycomb-lattice J1-J2 Heisenberg antiferromagnet with Dzyaloshinskii--Moriya interactions

  • Guilherme F. Figueiredo
  • E. Miranda
  • R. L. Doretto
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Abstract

We investigate triplon topology and the thermal Hall transport in a columnar valence-bond solid of a spin-1/2 honeycomb-lattice J1-J2 Heisenberg antiferromagnet. Inequivalent triangular sublattices, modeled by J2A≠ J2B, remove inversion symmetry at nearest-neighbor bond centers and allow in-plane Dzyaloshinskii--Moriya (DM) interactions. We identify the two symmetry-allowed in-plane DM vector patterns and present detailed results for the pattern parallel to the bonds including an out-of-plane magnetic field. Within a harmonic bond-operator treatment, we determine the triplon bands, their Berry curvatures and Chern numbers, and the triplon thermal Hall conductivity. The DM interaction and magnetic field generate nonzero Berry curvatures, but the numerically integrated Chern number of every isolated triplon band vanishes. Nevertheless, the energy-dependent Bose weighting of positive and negative Berry-curvature regions produces a finite thermal Hall response at nonzero low temperatures. We delimit the dilute-triplon regime in which the harmonic transport calculation is expected to be reliable. These results show that a vanishing Chern number band does not directly constrain the triplon response of a valence-bond solid. We also comment on the effects on the columnar valence-bond solid phase of a DM interaction between next-nearest-neighbor spins characterized by an out-of-plane vector pattern.

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Cite

BibTeXRIS
BibTeX
@misc{figueiredo2026triplon,
  title = {{Triplon thermal Hall response in a honeycomb-lattice $J_1$-$J_2$ Heisenberg antiferromagnet with Dzyaloshinskii--Moriya interactions}},
  author = {Guilherme F. Figueiredo and E. Miranda and R. L. Doretto},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.40910},
  eprint = {2610.40910},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.40910},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Triplon thermal Hall response in a honeycomb-lattice J_1-J_2 Heisenberg antiferromagnet with Dzyaloshinskii--Moriya interactions
AU  - Guilherme F. Figueiredo
AU  - E. Miranda
AU  - R. L. Doretto
PY  - 2026
DA  - 2026/10/29
PB  - arXiv
DO  - 10.48550/arxiv.2610.40910
UR  - https://arxiv.org/abs/2610.40910
AB  - 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≠ J_2^B, remove inversion symmetry at nearest-neighbor bond centers and allow in-plane Dzyaloshinskii--Moriya (DM) interactions. We identify the two symmetry-allowed in-plane DM vector patterns and present detailed results for the pattern parallel to the bonds including an out-of-plane magnetic field. Within a harmonic bond-operator treatment, we determine the triplon bands, their Berry curvatures and Chern numbers, and the triplon thermal Hall conductivity. The DM interaction and magnetic field generate nonzero Berry curvatures, but the numerically integrated Chern number of every isolated triplon band vanishes. Nevertheless, the energy-dependent Bose weighting of positive and negative Berry-curvature regions produces a finite thermal Hall response at nonzero low temperatures. We delimit the dilute-triplon regime in which the harmonic transport calculation is expected to be reliable. These results show that a vanishing Chern number band does not directly constrain the triplon response of a valence-bond solid. We also comment on the effects on the columnar valence-bond solid phase of a DM interaction between next-nearest-neighbor spins characterized by an out-of-plane vector pattern.
ER  -