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REVIEW 3 major objections 5 minor 69 references

Terahertz field-induced metastable magnetization near criticality in FePS3

T0 review · 3 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read A terahertz pulse creates a millisecond-lived magnetization in FePS3 near its critical temperature.

desk verdict Genuinely new millisecond-scale photoinduced magnetization near TN in FePS3 with a plausibly parameterized mechanism, but the long lifetime rests on an indirect optical proxy and the reported critical exponents have internal inconsistencies. read the letter →

arxiv 2507.06371 v1 pith:MTDNPZ5H submitted 2025-07-08 cond-mat.mtrl-sci cond-mat.str-elphysics.optics

Batyr Ilyas , Tianchuang Luo , Alexander von Hoegen , Emil Viñas Boström , Zhuquan Zhang , Jaena Park , Junghyun Kim , Je-Geun Park
show 3 more authors
Keith A. Nelson Angel Rubio Nuh Gedik
This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.str-elphysics.optics
keywords FePS3metastablemagnetizationterahertzexcitationcriticalfluctuationsphonon-inducedmagnetismvanderWaalsantiferromagnetGinzburg-Landautheoryslowingdown
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

Terahertz light, not heat, can create a hidden magnetic state in the layered antiferromagnet FePS3 that survives long after the pulse is gone. The paper shows that an intense terahertz pulse resonantly drives a 3.27 THz phonon mode, and the phonon's displacement changes the distances between magnetic ions in a way that favors a net out-of-plane magnetization. That magnetization is metastable for more than 2.5 milliseconds, and both its amplitude and its relaxation time grow sharply as the temperature approaches the 118 K Néel point. The growth follows a power law with exponents consistent with three-dimensional Ising critical behavior, indicating that the antiferromagnet's own critical fluctuations amplify and stabilize the new state. If this is right, regions near phase transitions are places to look for long-lived light-induced phases.

What carries the argument

The load-bearing object is the 3.27 THz phonon mode $Q_2$ and its coupling $g L M Q_2$ to the antiferromagnetic order parameter $L$ and the magnetization $M$. This trilinear term makes the magnetic free energy develop two shallow degenerate minima at finite $\pm M$ when the phonon is displaced; driving the phonon selects one minimum, and the sign of $M$ is fixed by $Q_2 L$. The same coupling makes $M$ relax adiabatically with $L$, so the metastable magnetization inherits the critical slowing down of the antiferromagnetic order parameter, $\tau \sim |T - T_N|^{-\nu z}$, which is why the lifetime reaches milliseconds near $T_N$.

What would settle it

A decisive check would be time-resolved X-ray magnetic circular dichroism at the iron edge after the terahertz pump at 118 K: if no dichroism with a decay time near 2.5 ms appears, or if its temperature dependence does not diverge with exponent $\gamma/2 \approx 0.56$, then the ellipticity signal is not the paper's magnetization. A second check is time-resolved X-ray diffraction to verify that the 3.27 THz phonon displacement pattern is present and that the induced magnetization scales quadratically with terahertz field.

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Extended reading notes

Core claim

The central claim is that nonlinear resonant driving of a specific phonon mode, not sample heating, produces a metastable magnetization in FePS3. The 3.27 THz phonon displacement modulates nearest-neighbor exchange couplings, and through the Ginzburg-Landau coupling term $g L M Q_2$ it makes a state with finite magnetization $M$ energetically favorable while the zigzag antiferromagnetic order $L$ remains dominant. The induced magnetization is detected as a transient circular dichroism and ellipticity change of an 800 nm probe, and its sign is locked to the product $Q_2 L$, so it is not reversed by an external magnetic field. Near the Néel temperature, the amplitude grows as $M(T) \sim |T - T_N|^{-\gamma/2}$ with $\gamma/2 = 0.56 \pm 0.05$, close to the three-dimensional Ising value, and the lifetime diverges because $M$ follows the critically slowed relaxation of $L$. First-principles spin-phonon couplings, Monte Carlo simulations, spin dynamics, and stochastic Ginzburg-Landau dynamics all support this picture.

Load-bearing premise

The load-bearing assumption is that the measured ellipticity change is a temperature-independent readout of the induced magnetization; if a non-magnetic contribution, such as a phonon-driven lattice distortion, adds to the ellipticity near $T_N$, the extracted critical exponent and the magnetic divergence claim would be compromised.

Editorial extensions

If this is right

  • The same resonantly driven phonon should be able to imprint a long-lived magnetization in other spin-phonon-coupled magnets, not only FePS3.
  • Materials tuned close to a magnetic critical point become natural targets for metastable light-induced phases, since critical fluctuations amplify small couplings and slow down relaxation.
  • The sign of the induced magnetization is fixed by the phonon displacement and the antiferromagnetic domain, so an external magnetic field cannot flip it.
  • The state is addressable on millisecond timescales, which makes it usable with slow probes such as transport, Hall effect, and X-ray magnetic circular dichroism.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Beyond the paper: if the critical-fluctuation amplifier is generic, then other van der Waals antiferromagnets with strong spin-phonon coupling, or strained versions of FePS3 with a shifted $T_N$, should show similar terahertz-induced metastable magnetization; this is a direct experimental test.
  • Beyond the paper: the predicted $M \sim \sqrt{\chi_{zz}}$ scaling means that tuning $T_N$ by pressure, strain, or thickness should shift the divergence in a predictable way, allowing controlled adjustment of both amplitude and lifetime.
  • Beyond the paper: combining the millisecond lifetime with optical writing and reading suggests a route toward non-volatile spintronic memory elements, if the state can be erased by a second pulse or by heating through $T_N$.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The paper reports that intense broadband terahertz pulses resonantly driving low-energy magnon and phonon modes in the zigzag antiferromagnet FePS3 produce a long-lived state with a net out-of-plane magnetization near the Néel temperature (TN≈118 K). The evidence includes temperature-dependent polarization rotation, ellipticity, and circular dichroism transients, with a pre-time-zero ellipticity accumulation modeled as pump-pulse accumulation and fitted to yield a decay time of about 2.5 ms at 118 K. The authors attribute the state to nonlinear excitation of the 3.27 THz phonon mode, which modulates exchange couplings and, through a Ginzburg-Landau coupling g L M Q2, stabilizes finite M. First-principles DFT, Monte Carlo, and spin-dynamics simulations are used to support the microscopic mechanism, and critical exponents extracted from the temperature dependence are compared with the 3D Ising universality class.

Significance. If correct, the result would be a rare example of a THz-induced metastable magnetic state with millisecond lifetime, and the proposed mechanism—critical fluctuations of the dominant AFM order stabilizing a sub-dominant magnetization—is conceptually novel and could guide searches for hidden states near critical points. The paper is strong in its combination of direct time-resolved probes, a first-principles parameterization of exchange and spin-phonon couplings, and multiscale dynamical modeling; the model parameters are not fitted to the THz-induced signals, and the off-resonant control and direct CD measurements strengthen the amplitude assignment. However, the headline lifetime and its divergence are extracted from the ellipticity channel under an acknowledged overestimation, and the mapping between ellipticity and magnetization is not established on the millisecond timescale. These issues are load-bearing for the central claim and require additional evidence.

major comments (3)
  1. [Methods: Extraction of relaxation time; Fig. 3] The 2.5 ms lifetime is extracted exclusively from the ellipticity channel via the pump-accumulation model of Eq. (4), while the direct magnetization probe (ΔCD) is reported only on sub-nanosecond traces (Fig. 2g,h). This is load-bearing because the manuscript states (Fig. 2f) that Δη contains a non-thermal contribution beyond the static thermal response; a slow lattice or thermal relaxation in the ellipticity channel could produce the same pre-time-zero accumulation without a magnetic origin. In addition, the Methods acknowledge that τdecay obtained from Eq. (5) is an overestimate because the post-zero maximum is not reached within the 30 ps window. Since the rise time itself slows near TN (Fig. 2i), the temperature-dependent overestimation can produce an apparent divergence in Fig. 3b even for a temperature-independent true lifetime. The authors should either measure ΔCD (or another direct magnetization probe) on millisecond time delays, or quantitatively rule out non-magnetic contributions to the slow ellipticity decay; without this, the central claim of a ms-lived metastable magnetization is not fully supported.
  2. [Ginzburg-Landau theory, Eq. (2)-(3)] The derivation of M ∼ √χ_zz is not established in the main text. Minimizing Eq. (2) over M and Q2 for a fixed L gives M² = (g²L²/Ω² − a_M)/b_M, so M is proportional to sqrt(L² − L_c²), not to sqrt(⟨L²⟩) in general. Below TN, where L has a nonzero condensed value with L² ∼ |T−T_N|^{2β}, this would give an exponent β (or a shifted square-root onset), not γ/2; above TN the relation requires treating L as a fluctuating variable with ⟨L²⟩ ∼ χ_zz. The text should define the averaging and state explicitly why the condensed part can be neglected (or why the fluctuation part dominates in the measured temperature range). Since Eq. (3) and the comparison with the 3D Ising exponent in Fig. 2e rest on this relation, the theoretical support for the critical amplitude divergence is currently incomplete.
  3. [Results: 'we assume that Δη0(T) acts as a probe of the magnetization'; Fig. 2e] The power-law fit of Δη0(T) to Eq. (6) assumes a temperature-independent proportionality between the measured ellipticity change and the induced magnetization M(T). The paper supports this by the similarity of Δη0(T) and ΔCD0(T), but both quantities are measured at the same short delay (~170 ps) and therefore cannot validate the long-lived component, and Fig. 2f shows that Δη contains an additional non-thermal contribution whose temperature dependence is not characterized. A temperature-dependent non-magnetic contribution to Δη near TN would change the fitted exponent and the inferred divergence. The authors should either isolate the magnetic component of Δη0(T) (e.g., through the CD channel with comparable statistics) or provide an explicit calibration of the ellipticity-to-magnetization conversion as a function of temperature.
minor comments (5)
  1. [Methods: Fitting and extracting critical constants] The fitted low-temperature decay exponent νz=0.72 (and 0.56 above) is described as 'close' to the 3D Ising value 1.27; with no error bars given for these values, this agreement claim should be softened or quantified.
  2. [Fig. 3b] The vertical axis label should specify units of τdecay (ms) and indicate that the plotted values are overestimates, as stated in the text; currently the reader could mistake them for quantitative lifetimes.
  3. [Throughout] The text alternates between Ω and Q for phonon labels (Ω1, Ωm, Ω3 vs. Q1, Q2); unify the notation to avoid confusion.
  4. [Data Availability] Data availability is limited to 'on reasonable request'; for a study with strong computational and experimental components, a public data/code repository would improve reproducibility.
  5. [Methods: Fitting and extracting critical constants] The paragraph introducing Eq. (8) uses 'critical constants' where 'critical exponents' is meant; correct the terminology.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity: the theory parameters are computed from first principles and benchmarked against external data, while the lifetime and critical exponents are data extractions with explicitly stated assumptions.

full rationale

The central derivation chain is self-contained. The Ginzburg-Landau parameters and spin-phonon couplings are obtained from DFT calculations and validated against equilibrium neutron data and Monte Carlo simulations, not fitted to the THz-induced signals. The relation M ~ sqrt(chi_zz) is derived from the free energy, and the comparison of the extracted exponent (gamma/2 = 0.56 +/- 0.05) to the 3D Ising value (0.62) is an external benchmark. The identification of Delta-eta-0(T) as a probe of magnetization is explicitly stated and corroborated by the similar temperature dependence of Delta-CD-0(T), so the power-law fit is an extraction rather than a re-statement of an input. The 2.5 ms lifetime is a fit parameter obtained from the stated pump-accumulation model, not a first-principles prediction, and the paper openly notes that the tau_decay values are overestimated because the post-time-zero maximum is not reached within the measurement window; this is a systematic-uncertainty caveat, not a circular reduction. The only mild self-citation is the use of Refs. [40,49] for the spin Hamiltonian and equilibrium magnetic properties, but the parameters are recomputed here and independently validated against neutron data, so the self-citation is not load-bearing.

Assumptions & free parameters 5 free parameters · 6 assumptions · 0 invented entities

The central theoretical claim relies on: (1) the validity of the spin Hamiltonian (Eq. 1) with parameters computed from first principles and validated against neutron scattering; (2) the linear spin-phonon expansion; (3) the coarse-grained Ginzburg-Landau free energy (Eq. 2) as an effective description near T_N; (4) the assumption of 3D Ising universality; (5) the adiabatic separation of time scales between M and L; and (6) standard dynamical critical scaling. None of these are unique to this paper or fitted to the THz data.

free parameters (5)
  • A (amplitude of M(T) power law) = not reported
    Fitted amplitude in Eq. (6) for Δη0(T) vs T.
  • γ/2 (critical exponent of M(T)) = 0.56 ± 0.05 (T<T_N), 0.53 ± 0.05 (T>T_N)
    Extracted from power-law fits to Δη0(T); compared to 3D Ising 0.62.
  • const (offset in M(T) fit) = not reported
    Free offset in Eq. (6), rounds the divergence.
  • τ0 and νz for rise time = νz = 1.07 ± 0.27 (T<T_N), 0.44 ± 0.07 (T>T_N); τ0 not reported
    Fit to Eq. (8) for rise time.
  • τ0 and νz for decay time = νz = 0.72 and 0.56 (Methods) or 0.89 and 0.56 (Fig 3b); τ0 not reported
    Fit to Eq. (8) for decay time; inconsistent between text and figure.
assumptions (6)
  • domain assumption Spin Hamiltonian (Eq. 1) with Heisenberg exchange and single-ion anisotropy is valid for FePS3.
    Assumed spin model; parameters from DFT/tb2j and validated against neutron scattering (Refs [35,40]).
  • standard math Linear spin-phonon expansion J(Q) ≈ J − αQ for small displacements.
    Taylor expansion for small displacements; α values from frozen phonon DFT.
  • domain assumption Coarse-grained Ginzburg-Landau free energy (Eq. 2) captures the interplay of L, M, and Q2 near T_N.
    Effective theory with symmetry-allowed couplings; used for both equilibrium and dynamic analysis.
  • domain assumption FePS3 belongs to the 3D Ising universality class for the AFM transition.
    Used to compare exponents; relies on strong Ising anisotropy. The actual exponents could differ if the transition is not truly 3D Ising.
  • domain assumption Adiabatic following of M to the free energy minimum set by L.
    Assumes M relaxes fast and L slow (Eq. 9); needed to transfer critical slowing down to M.
  • standard math Critical slowing down with τ ~ |T−T_N|^{−νz} for the dominant order parameter.
    Standard theory of dynamical critical phenomena (Hohenberg-Halperin), applied to the dominant order parameter L.

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Cite this review

Pith. "Pith review of Terahertz field-induced metastable magnetization near criticality in FePS3." pith.science (2026). https://pith.science/paper/MTDNPZ5H

@misc{pith2026250706371,
  author       = {Pith},
  title        = {Pith review of: Terahertz field-induced metastable magnetization near criticality in FePS3},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/MTDNPZ5H}},
  note         = {Machine review of arXiv:2507.06371}
}
read the original abstract

Controlling the functional properties of quantum materials with light has emerged as a frontier of condensed-matter physics, leading to the discovery of various light-induced phases of matter, such as superconductivity, ferroelectricity, magnetism and charge density waves. However, in most cases, the photoinduced phases return to equilibrium on ultrafast timescales after the light is turned off, limiting their practical applications. Here we use intense terahertz pulses to induce a metastable magnetization with a remarkably long lifetime of more than 2.5 milliseconds in the van der Waals antiferromagnet FePS3. The metastable state becomes increasingly robust as the temperature approaches the antiferromagnetic transition point, suggesting that critical order parameter fluctuations play an important part in facilitating the extended lifetime. By combining first-principles calculations with classical Monte Carlo and spin dynamics simulations, we find that the displacement of a specific phonon mode modulates the exchange couplings in a manner that favours a ground state with finite magnetization near the N\'eel temperature. This analysis also clarifies how the critical fluctuations of the dominant antiferromagnetic order can amplify both the magnitude and the lifetime of the new magnetic state. Our discovery demonstrates the efficient manipulation of the magnetic ground state in layered magnets through non-thermal pathways using terahertz light and establishes regions near critical points with enhanced order parameter fluctuations as promising areas to search for metastable hidden quantum states.

Figures

Figures reproduced from arXiv: 2507.06371 by the authors.

Figure 1
Figure 1. Experimental schematics and THz field-driven low energy modes. a. [PITH_FULL_IMAGE:figures/full_fig_p021_1.png] view at source ↗
Figure 2
Figure 2. THz field-induced nonequilibrium state with a net magnetization. [PITH_FULL_IMAGE:figures/full_fig_p022_2.png] view at source ↗
Figure 3
Figure 3. Decay time of the photoinduced state exceeds [PITH_FULL_IMAGE:figures/full_fig_p023_3.png] view at source ↗
Figures from the paper (1 more)
Figure 4
Figure 4. Figure 4: Nonlinear excitation of Q2 phonon triggers a net magnetization and the critical fluctua￾tions facilitate its metastability. Field strength dependence of the 3.27 THz (a) phonon mode amplitude. The 3.27 THz phonon has both linear and quadratic components, that interfere…

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