Dipolar and quadrupolar spin supersolid states in a spin-1 triangular antiferromagnet
Abstract
We present a systematic numerical study of the spin-1 antiferromagnetic Heisenberg model on the triangular lattice in an out-of-plane magnetic field, using Density Matrix Renormalization Group (DMRG) methods. By mapping out the quantum phase diagram as a function of the single-ion anisotropy Dz and magnetic field, we identify distinct dipolar and quadrupolar spin supersolid states, characterized by spontaneous U(1) symmetry breaking with finite spin superfluid stiffness coexisting with longitudinal translational symmetry breaking. At zero field, the dipolar spin supersolid with a 'Y'-type spin configuration persists down to Dz = 0, whereas the quadrupolar spin supersolid prevails at large Dz. At intermediate fields, the phase diagram is dominated by an up-up-down phase. At high fields below saturation, a quadrupolar spin superfluid emerges in the large-Dz regime, whereas a dipolar spin supersolid with a 'V'-type spin configuration dominates at small Dz. These phases are characterized through their order parameters and spin superfluid stiffness using calculations on various system sizes. Furthermore, the dynamical spin structure factor is obtained across the phase diagram, where characteristic spectral signatures of different phases are observed, including the gapless Goldstone mode and the roton-like minima. These features are directly accessible to inelastic neutron scattering experiments. Our results provide a theoretical understanding of the interplay between frustrations, anisotropy, and Zeeman interactions in driving distinct spin supersolid phases in the spin-1 system, which are relevant to various triangular-lattice antiferromagnets such as Na2BaNi(PO4)2 and K2Ni(SeO3)2.
Related
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BibTeX
@misc{huang2026dipolar,
title = {{Dipolar and quadrupolar spin supersolid states in a spin-1 triangular antiferromagnet}},
author = {Yixuan Huang and Yuan Gao and Wei Li and Seiji Yunoki and Sadamichi Maekawa},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.05181},
eprint = {2609.05181},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.05181},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Dipolar and quadrupolar spin supersolid states in a spin-1 triangular antiferromagnet
AU - Yixuan Huang
AU - Yuan Gao
AU - Wei Li
AU - Seiji Yunoki
AU - Sadamichi Maekawa
PY - 2026
DA - 2026/09/04
PB - arXiv
DO - 10.48550/arxiv.2609.05181
UR - https://arxiv.org/abs/2609.05181
AB - We present a systematic numerical study of the spin-1 antiferromagnetic Heisenberg model on the triangular lattice in an out-of-plane magnetic field, using Density Matrix Renormalization Group (DMRG) methods. By mapping out the quantum phase diagram as a function of the single-ion anisotropy D_z and magnetic field, we identify distinct dipolar and quadrupolar spin supersolid states, characterized by spontaneous U(1) symmetry breaking with finite spin superfluid stiffness coexisting with longitudinal translational symmetry breaking. At zero field, the dipolar spin supersolid with a 'Y'-type spin configuration persists down to D_z = 0, whereas the quadrupolar spin supersolid prevails at large D_z. At intermediate fields, the phase diagram is dominated by an up-up-down phase. At high fields below saturation, a quadrupolar spin superfluid emerges in the large-D_z regime, whereas a dipolar spin supersolid with a 'V'-type spin configuration dominates at small D_z. These phases are characterized through their order parameters and spin superfluid stiffness using calculations on various system sizes. Furthermore, the dynamical spin structure factor is obtained across the phase diagram, where characteristic spectral signatures of different phases are observed, including the gapless Goldstone mode and the roton-like minima. These features are directly accessible to inelastic neutron scattering experiments. Our results provide a theoretical understanding of the interplay between frustrations, anisotropy, and Zeeman interactions in driving distinct spin supersolid phases in the spin-1 system, which are relevant to various triangular-lattice antiferromagnets such as Na_2BaNi(PO_4)_2 and K_2Ni(SeO_3)_2.
ER -