Melting noncoplanar order on the square-kagome lattice: Chiral, flat-band, and staggered spin liquids from projective symmetry
Abstract
Noncoplanar magnetic orders carry a scalar spin chirality, and their melting by quantum fluctuations has been proposed as a route to chiral spin liquids. We ask what this route can produce on the square-kagome lattice, where couplings across the octagons stabilize noncoplanar cuboc and conical orders. We classify the fermionic spin liquids of this lattice by their projective symmetry groups, identify the symmetry class into which each noncoplanar order would melt, and compare candidate states with Gutzwiller-projected wave functions. A magnetic selection rule constrains the route: the chirality of every cuboc and conical order alternates in space, so a liquid that keeps the symmetry of its parent order has zero Chern number and no spontaneous thermal Hall response. A Chern state can descend only from uniformly chiral orders, and the regular ones we find need ferromagnetic bow-tie couplings. The energetics do not favor a chiral liquid either: among the projected wave functions we compare, a cuboc1-ordered state is lowest for strong cross-octagon couplings, and nonchiral states, a valence-bond crystal or a time-reversal-symmetric liquid, for weaker ones. The two inequivalent site orbits shape the spinons: a relative time-reversal sign between them pins flat bands to the Fermi level, and because the translations of p4mm are not commutators, staggered chiral liquids exist, which are absent on sixfold-symmetric lattices.
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BibTeX
@misc{raj2026melting,
title = {{Melting noncoplanar order on the square-kagome lattice: Chiral, flat-band, and staggered spin liquids from projective symmetry}},
author = {Harsh Raj and Atanu Maity and Yasir Iqbal},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00987},
eprint = {2611.00987},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00987},
}
RIS
TY - UNPB
TI - Melting noncoplanar order on the square-kagome lattice: Chiral, flat-band, and staggered spin liquids from projective symmetry
AU - Harsh Raj
AU - Atanu Maity
AU - Yasir Iqbal
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00987
UR - https://arxiv.org/abs/2611.00987
AB - Noncoplanar magnetic orders carry a scalar spin chirality, and their melting by quantum fluctuations has been proposed as a route to chiral spin liquids. We ask what this route can produce on the square-kagome lattice, where couplings across the octagons stabilize noncoplanar cuboc and conical orders. We classify the fermionic spin liquids of this lattice by their projective symmetry groups, identify the symmetry class into which each noncoplanar order would melt, and compare candidate states with Gutzwiller-projected wave functions. A magnetic selection rule constrains the route: the chirality of every cuboc and conical order alternates in space, so a liquid that keeps the symmetry of its parent order has zero Chern number and no spontaneous thermal Hall response. A Chern state can descend only from uniformly chiral orders, and the regular ones we find need ferromagnetic bow-tie couplings. The energetics do not favor a chiral liquid either: among the projected wave functions we compare, a cuboc1-ordered state is lowest for strong cross-octagon couplings, and nonchiral states, a valence-bond crystal or a time-reversal-symmetric liquid, for weaker ones. The two inequivalent site orbits shape the spinons: a relative time-reversal sign between them pins flat bands to the Fermi level, and because the translations of p4mm are not commutators, staggered chiral liquids exist, which are absent on sixfold-symmetric lattices.
ER -