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arxiv: 2507.20705 · v4 · submitted 2025-07-28 · ❄️ cond-mat.mtrl-sci

Light-induced Odd-parity Magnetism in Conventional Collinear Antiferromagnets

Shengpu Huang , Zheng Qin , Fangyang Zhan , Dong-Hui Xu , Da-Shuai Ma , Rui Wang This is my paper

Pith reviewed 2026-05-19 03:07 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords odd-parity magnetismcollinear antiferromagnetsFloquet engineeringlight-induced spin splittingtwo-dimensional materialsantiferromagnetic monolayerscompensated magnetism
0
0 comments X

The pith

Periodic light can induce odd-parity magnetism in conventional two-dimensional collinear antiferromagnets.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that Floquet engineering with periodic light fields, including circular and elliptically polarized light, generates odd-parity spin splitting in two-dimensional collinear antiferromagnets. This is shown through symmetry arguments and effective model analysis, offering a universal method without requiring non-collinear magnetic structures. A classification of candidate monolayer and bilayer materials is provided, along with demonstrations of how to control or reverse the splitting via light polarization or crystal symmetry. First-principles calculations combined with the Floquet theorem confirm the effect in specific examples. This approach expands the toolkit for designing unconventional compensated magnetism using light.

Core claim

Using symmetry arguments and effective model analysis, Floquet engineering offers a universal strategy for achieving odd-parity magnetism in two-dimensional collinear antiferromagnets under irradiation of periodic driving light fields such as circularly polarized light, elliptically polarized light, and bicircular light. The light-induced odd-parity spin splitting can be flexibly controlled by adjusting the crystalline symmetry or the polarization state of incident light.

What carries the argument

Floquet engineering of periodic driving light fields in collinear antiferromagnetic monolayers and bilayers, which induces effective odd-parity spin splitting.

If this is right

  • The spin splitting can be reversed or converted by changing the polarization state of the incident light.
  • Collinear antiferromagnets can exhibit odd-parity magnetism typically associated with non-collinear configurations.
  • A comprehensive classification of potential candidate materials for this effect is established.
  • First-principles calculations verify the phenomenon in illustrative 2D AFM materials.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • This could provide a light-based method to engineer spintronic properties in common magnetic materials.
  • Further studies might explore whether similar effects occur in three-dimensional systems or under different driving frequencies.
  • Experimental realization would require checking if the magnetic order survives the light irradiation in real samples.

Load-bearing premise

Symmetry arguments and effective models remain valid when real collinear antiferromagnetic materials are subjected to continuous periodic light driving without the magnetic order being destabilized or unaccounted dissipation appearing.

What would settle it

An experiment that irradiates a classified 2D collinear antiferromagnet with circularly polarized light and measures no odd-parity spin splitting in the electronic bands, or finds that the antiferromagnetic order is destroyed.

Figures

Figures reproduced from arXiv: 2507.20705 by Da-Shuai Ma, Dong-Hui Xu, Fangyang Zhan, Rui Wang, Shengpu Huang, Zheng Qin.

Figure 1
Figure 1. Figure 1: FIG. 1. Illustration of a general route to the odd-parity spin [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. A simple model for the light-induced odd-parity spin [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. CPL induced [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. CPL-irradiated conventional AFM with [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. The band structure of the lattice model in Eq.2 of the main text under LPL with a vector potential [PITH_FULL_IMAGE:figures/full_fig_p010_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. The CPL irradiated band band structure for the lattice model in Eq. ( [PITH_FULL_IMAGE:figures/full_fig_p010_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Odd-parity spin splitting realized in light irradiated van der Waals magnetic multilayer. (a)-(b) The band structure of bilayer case [PITH_FULL_IMAGE:figures/full_fig_p011_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. The spin-splitting and degeneracy in AFM bilayers. (a)-(b) The magnetic configuration and CPL irradiated band structure of [PITH_FULL_IMAGE:figures/full_fig_p012_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. The intrinsic spin-degenerate band structure of (a) [PITH_FULL_IMAGE:figures/full_fig_p012_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10. BCPL and EPL induced [PITH_FULL_IMAGE:figures/full_fig_p013_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. CPL induced [PITH_FULL_IMAGE:figures/full_fig_p013_11.png] view at source ↗
read the original abstract

Recent studies have drawn growing attention on non-relativistic odd-parity magnetism in the wake of altermagnets. Nevertheless, odd-parity spin splitting is often believed to appear in non-collinear magnetic configurations. Here, using symmetry arguments and effective model analysis, we show that Floquet engineering offers a universal strategy for achieving odd-parity magnetism in two-dimensional (2D) collinear antiferromagnets under irradiation of periodic driving light fields such as circularly polarized light, elliptically polarized light, and bicircular light. A comprehensive classification of potential candidates for collinear monolayer or bilayer antiferromagnets is established. Strikingly, the light-induced odd-parity spin splitting can be flexibly controlled by adjusting the crystalline symmetry or the polarization state of incident light, enabling the reversal or conversion of spin-splitting. By combining first-principles calculations and Floquet theorem, we present illustrative examples of 2D collinear antiferromagnetic (AFM) materials to verify the light-induced odd-parity magnetism. Our work not only offers a powerful approach for uniquely achieving odd-parity spin-splitting with high tunability, but also expands the potential of Floquet engineering in designing unconventional compensated magnetism.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript proposes that Floquet engineering with periodic driving light fields (circularly polarized, elliptically polarized, and bicircular light) offers a universal strategy to induce odd-parity magnetism and spin splitting in two-dimensional collinear antiferromagnets. Using symmetry arguments and effective model analysis, the authors establish a classification of candidate monolayer and bilayer materials, demonstrate tunability including reversal or conversion of the splitting by adjusting crystalline symmetry or light polarization, and verify the effect with first-principles calculations combined with the Floquet theorem for illustrative examples.

Significance. If the central claims hold, the work provides a tunable route to odd-parity spin splitting in conventional collinear AFMs, which are not expected to exhibit such effects in equilibrium. The classification of candidates and the explicit demonstration of control via light polarization state represent concrete advances that expand Floquet engineering applications to compensated magnetism in 2D materials.

major comments (2)
  1. [Symmetry arguments and effective model analysis section] Symmetry arguments and effective model analysis section: the derivation of the light-induced odd-parity term relies on the high-frequency Floquet approximation remaining valid while preserving the underlying collinear AFM order. No quantitative bounds are given on driving intensity or frequency to ensure that heating, multi-photon spin-flip rates, or phonon-assisted dissipation remain negligible for the proposed monolayer/bilayer candidates.
  2. [First-principles calculations and Floquet theorem examples] First-principles calculations and Floquet theorem examples: the illustrative DFT+Floquet results for specific 2D collinear AFM materials do not report error estimates or convergence checks with respect to the truncation of the Floquet sidebands or the assumed driving amplitude, leaving open whether the reported spin-splitting magnitudes survive realistic experimental conditions.
minor comments (2)
  1. [Abstract] The abstract states that the effect 'can be flexibly controlled' but does not specify the range of polarization parameters over which reversal occurs; a brief quantitative example would improve clarity.
  2. [effective model analysis] Notation for the effective Hamiltonian terms in the model analysis could be made more explicit by labeling the odd-parity component with a distinct symbol to distinguish it from equilibrium terms.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments and positive evaluation of the significance of our work. We address the two major comments point by point below, agreeing that additional discussion and checks will improve the manuscript.

read point-by-point responses

  1. Referee: [Symmetry arguments and effective model analysis section] Symmetry arguments and effective model analysis section: the derivation of the light-induced odd-parity term relies on the high-frequency Floquet approximation remaining valid while preserving the underlying collinear AFM order. No quantitative bounds are given on driving intensity or frequency to ensure that heating, multi-photon spin-flip rates, or phonon-assisted dissipation remain negligible for the proposed monolayer/bilayer candidates.

    Authors: We agree that explicit quantitative bounds would strengthen the presentation of the high-frequency approximation. In the revised manuscript we will add a dedicated paragraph in the symmetry and effective-model section that provides order-of-magnitude estimates for the driving frequency (much larger than the electronic bandwidth and exchange scale) and intensity (below the threshold for significant heating or multi-photon processes) drawn from typical experimental conditions in 2D materials. These bounds will be tied to the preservation of the collinear AFM order and will reference relevant literature on Floquet-driven 2D magnets. revision: yes

  2. Referee: [First-principles calculations and Floquet theorem examples] First-principles calculations and Floquet theorem examples: the illustrative DFT+Floquet results for specific 2D collinear AFM materials do not report error estimates or convergence checks with respect to the truncation of the Floquet sidebands or the assumed driving amplitude, leaving open whether the reported spin-splitting magnitudes survive realistic experimental conditions.

    Authors: We acknowledge the absence of explicit convergence data and error estimates in the current DFT+Floquet results. In the revision we will include additional panels and tables showing the spin-splitting magnitude as a function of the number of retained Floquet sidebands (e.g., N=3,5,10) and as a function of driving amplitude within the perturbative regime. We will also report numerical convergence with respect to k-point sampling and basis-set size, together with a brief discussion of how the reported values remain robust under realistic experimental conditions such as finite pulse length and weak substrate coupling. revision: yes

Circularity Check

0 steps flagged

No circularity: symmetry classification plus Floquet application to collinear AFMs is self-contained

full rationale

The derivation proceeds from standard symmetry arguments and effective-model analysis under periodic driving (Floquet theorem) to classify candidates and illustrate with first-principles examples. No load-bearing step reduces by construction to a fitted parameter, self-citation chain, or renamed input; the central claim is a proposal that applies established theorems to a new materials context without internal redefinition or statistical forcing.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests primarily on symmetry arguments and the applicability of the Floquet theorem to light-driven 2D systems; no explicit free parameters or new entities are introduced in the abstract.

axioms (2)
  • domain assumption Symmetry arguments establish that periodic light driving can induce odd-parity spin splitting in collinear antiferromagnets
    Invoked to show the effect is possible despite conventional expectations for non-collinear orders.
  • domain assumption Effective model analysis and Floquet theorem accurately capture the light-induced magnetism in 2D materials
    Used to classify candidates and verify with first-principles examples.

pith-pipeline@v0.9.0 · 5757 in / 1345 out tokens · 43313 ms · 2026-05-19T03:07:50.009189+00:00 · methodology

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Forward citations

Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Mixed-Parity Altermagnetism in Collinear Spin-Orbital Magnets

    cond-mat.mes-hall 2026-05 unverdicted novelty 7.0

    Collinear spin-orbital magnets host mixed-parity altermagnetism as an intermediate regime between even- and odd-parity forms, inducible by circularly polarized light in a two-sublattice two-orbital model.

  2. Tunable Odd-Parity Spin Splittings in Altermagnets

    cond-mat.mes-hall 2026-05 unverdicted novelty 7.0

    Collinear altermagnets can exhibit tunable mixed-parity spin textures and new dissipationless spin Hall responses when driven by two-color light or coupled to P-odd loop-current order, creating (P,T)=(-,-) or (+,+) states.

  3. Anomalous thermoelectric and thermal Hall effects in irradiated altermagnets

    cond-mat.mes-hall 2026-02 unverdicted novelty 7.0

    Elliptically polarized light irradiation converts d-wave altermagnets into Chern insulators, yielding quantized thermal Hall conductivity and gap-edge peaks in the thermoelectric Hall response.

  4. Layer Hall effect induced by altermagnetism

    cond-mat.mes-hall 2026-01 unverdicted novelty 7.0

    D-wave altermagnets on Bi2Se3 surfaces induce a layer Hall effect with zero net Hall conductance for antiparallel Néel vectors and a quantized Chern state for parallel vectors.

  5. Odd-Parity Altermagnetism Originated from Orbital Orders

    cond-mat.mes-hall 2025-08 conditional novelty 7.0

    A symmetry-based stacking strategy with layer-flip realizes odd-parity altermagnetism from nonrelativistic orbital orders, hosting quantum spin Hall phases with helical edge states.

  6. Quantum Geometry-Driven Nonlinear Spin Currents in Floquet Non-Hermitian Altermagnets

    cond-mat.mes-hall 2026-05 unverdicted novelty 5.0

    Nonlinear spin conductivity in Floquet non-Hermitian d-wave altermagnets separates into quantum-metric, Berry-curvature and dipole terms and is dominated by the bare quantum metric, with polarization reversing both lo...

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