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PreprintCC BY 4.0arXiv

Chiral Valence-Bond Solid and Chiral Triplons

  • Shinnosuke Koyama
  • Kazumasa Hattori
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Abstract

We propose a chiral valence-bond solid (VBS) in which spin-singlet bond order itself spontaneously acquires handedness without magnetic order. Using a spin-lattice model on the diamond lattice, we demonstrate two enantiomorphic VBS states. In the presence of anisotropic spin interactions, this emergent handedness is inherited by chiral triplons with spin-split bands and spin textures that reverse between the two enantiomers. These textures generate a temperature-gradient-induced net spin response whose sign is set by the VBS handedness. The imaginary off-diagonal components of the dynamical spin structure factor encode the triplon polarization and change sign between the two enantiomers, enabling direct detection of chiral triplons and the selected handedness by polarized inelastic neutron scattering. Our results establish a direct connection between spontaneous chirality and magnetic excitations, opening avenues for exploring the interplay between quantum magnetism and chiral physics.

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Cite

BibTeXRIS
BibTeX
@misc{koyama2026chiral,
  title = {{Chiral Valence-Bond Solid and Chiral Triplons}},
  author = {Shinnosuke Koyama and Kazumasa Hattori},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2609.12856},
  eprint = {2609.12856},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.12856},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Chiral Valence-Bond Solid and Chiral Triplons
AU  - Shinnosuke Koyama
AU  - Kazumasa Hattori
PY  - 2026
DA  - 2026/10/16
PB  - arXiv
DO  - 10.48550/arxiv.2609.12856
UR  - https://arxiv.org/abs/2609.12856
AB  - We propose a chiral valence-bond solid (VBS) in which spin-singlet bond order itself spontaneously acquires handedness without magnetic order. Using a spin-lattice model on the diamond lattice, we demonstrate two enantiomorphic VBS states. In the presence of anisotropic spin interactions, this emergent handedness is inherited by chiral triplons with spin-split bands and spin textures that reverse between the two enantiomers. These textures generate a temperature-gradient-induced net spin response whose sign is set by the VBS handedness. The imaginary off-diagonal components of the dynamical spin structure factor encode the triplon polarization and change sign between the two enantiomers, enabling direct detection of chiral triplons and the selected handedness by polarized inelastic neutron scattering. Our results establish a direct connection between spontaneous chirality and magnetic excitations, opening avenues for exploring the interplay between quantum magnetism and chiral physics.
ER  -