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REVIEW 4 major objections 6 minor 85 references

Initial Stages of Rejuvenation of Vapor-Deposited Glasses during Isothermal Annealing: Contrast Between Experiment and Simulation

T0 review · 4 major / 6 minor · reviewed 2026-08-12 · deepseek-v4-flash

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Pith's one-line read Annealing stable glasses raises their dielectric storage without touching loss, a sign the boson peak recovers before the glass transforms.

desk verdict A real experimental observation with a provisional interpretation; the simulation contrast is clean but rests on an unverified boson-peak identification. read the letter →

arxiv 2411.17540 v1 pith:L54PCXWN submitted 2024-11-26 cond-mat.soft cond-mat.dis-nncond-mat.mtrl-sci

Megan E. Tracy , Benjamin J. Kasting , Cecilia Herrero , Ludovic Berthier , Ranko Richert , Anthony Guiseppi-Elie , Mark D. Ediger This is my paper · ORCID
classification cond-mat.softcond-mat.dis-nncond-mat.mtrl-sci PACS 64.70.P77.22.Gm
keywords vapor-depositedglassesrejuvenationbosonpeakdielectricspectroscopyswapMonteCarlokineticstabilityglasstransitionmethyl-m-toluate
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

This paper asks what happens in the earliest stages of a stable glass turning back into a supercooled liquid. By annealing vapor-deposited glasses of methyl-m-toluate just below their glass transition for six hours and measuring the dielectric response, the authors find that the most stable glasses increase their storage susceptibility by about 2% with no change in the loss. They interpret the rise as a partial recovery of the boson peak, a high-frequency vibrational excess common to all glasses, while the alpha relaxation that signals full transformation remains untouched. In contrast, swap Monte Carlo simulations of ultrastable glasses show no change in the vibrational dynamics of the glass until the alpha relaxation begins. The paper thus claims that stable glass properties can evolve before the glass transforms, and that current simulations miss this early softening.

What carries the argument

The central object is the complex dielectric susceptibility and the Kramers-Kronig relation that links a high-frequency absorption (the boson peak) to a flat contribution in the storage component chi' over a lower-frequency window, with negligible change in the loss component chi''. In the simulations, the mean-squared displacement of particles classified as glassy, decomposed from the liquid particles, serves as the probe of vibrational dynamics; the swap Monte Carlo algorithm generates the ultrastable configurations. The boson peak is defined as the excess in the vibrational density of states relative to the Debye crystal, appearing in dielectric spectra around 100 to 1000 GHz.

What would settle it

Directly measure the boson peak, for example by inelastic neutron or Brillouin light scattering, on a 0.80Tg MMT film before and after six hours of annealing at 0.98Tg; if the boson-peak intensity does not increase by roughly 7% while chi' rises 2%, the proposed mechanism fails.

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Extended reading notes

Core claim

For highly stable MMT glasses deposited at 0.85Tg and 0.80Tg, annealing at 0.98Tg for six hours (about 2% of the estimated transformation time) leaves the onset temperature of the alpha relaxation unchanged, but raises the storage component of the dielectric susceptibility by roughly 20% of the way to the equilibrium value, uniformly across the measured spectrum, with no corresponding rise in the loss component. The authors argue from Kramers-Kronig relations that this pattern implies a high-frequency process above the experimental window is recovering, and they speculatively identify it as the boson peak. Using the boson peak spectral shape from glycerol and a 34% suppression from indomethacin, they reconstruct the dielectric response and find that a 7% recovery of the boson peak intensity reproduces the measured 2% increase in chi' at 20 Hz. In swap Monte Carlo simulations of a two-dimensional polydisperse system, the mean-squared displacement of particles that remain in the glass state is identical for waiting times corresponding to liquid fractions up to 5%, indicating no softening of the glass prior to transformation. The paper concludes that the boson peak recovers more quickly than the transformation of stable glass into supercooled liquid, and that the current simulations do not capture this early evolution of stable glass properties.

Load-bearing premise

The observed rise in the storage component without a corresponding rise in loss is caused by a partial recovery of the boson peak, with the boson peak's intensity and spectral shape estimated from other glass-formers (indomethacin and glycerol) rather than measured in methyl-m-toluate.

Editorial extensions

If this is right

  • The alpha-relaxation onset temperature is not a complete measure of a stable glass's state; other properties can evolve while the onset stays fixed.
  • The boson peak can serve as a sensitive early indicator of rejuvenation in vapor-deposited glasses, detectable through changes in dielectric storage.
  • Swap Monte Carlo simulations of polydisperse disk glasses do not reproduce this early softening, suggesting that current coarse-grained models miss physics relevant to molecular glasses.
  • The KWW and Tool-Narayanaswamy-Moynihan analysis provides a way to estimate extremely long structural relaxation times (up to 10^10 s) from short sub-Tg annealing experiments.

Reading between the lines

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

  • If the boson peak interpretation holds, the early softening should be observable with direct high-frequency probes such as neutron or Brillouin light scattering on the same MMT films, before any shift in the onset temperature appears.
  • The discrepancy between experiment and simulation may stem from the much larger temperature up-jump used in simulations (about threefold versus ten percent); simulations with smaller up-jumps, if computationally feasible, might reveal a slow softening that currently falls outside the numerical time window.
  • The constant-background subtraction method assumes the substrate response does not drift over six hours; a control experiment with an uncoated electrode pair would confirm that the 2% rise is not an instrumental artifact.
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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

4 major / 6 minor

Summary. The manuscript describes isothermal annealing experiments on vapor-deposited glasses of methyl-m-toluate (MMT) at 0.98Tg for up to six hours, monitored by dielectric spectroscopy. Films deposited at 0.95Tg fully rejuvenate, while 0.90Tg films partially rejuvenate, as judged by changes in the dielectric susceptibility and in the onset temperature of the alpha relaxation measured on subsequent heating. For the most stable films (deposited at 0.80Tg and 0.85Tg), the onset temperature is essentially unchanged, but the storage component χ' increases by roughly 2% at 20 Hz (about 20% of the way to the equilibrium value) with no measurable change in the loss component χ''. The authors interpret this as a partial recovery of the boson peak, conclude that the boson peak recovers faster than the stable-glass-to-liquid transformation, and compare with swap Monte Carlo simulations of ultrastable two-dimensional glasses, which show no evolution of the vibrational dynamics of the glass particles before transformation. The paper also reports KWW fits to the onset-temperature evolution and a Tool-Narayanaswamy-Moynihan analysis to estimate the extremely long relaxation times of the stable glasses at their deposition temperatures.

Significance. If the experimental observation is robust and the assignment to the boson peak is correct, the result is significant: it would demonstrate that the vibrational properties of an ultrastable glass evolve on timescales orders of magnitude shorter than the alpha-rejuvenation time, with direct implications for models of stable-glass softening and for the physical picture of rejuvenation. The simulation part is a strength: the MSD and van Hove analyses are clearly presented and constitute a clean, reproducible null result that is a valuable point of comparison. The authors are also commendably explicit about the speculative nature of the boson-peak identification. However, the significance of the central claim is currently limited because the key experimental effect is small and lacks reported uncertainty and drift controls, and because the boson-peak recovery is reconstructed by fitting rather than measured independently; as a result, the claimed contrast between experiment and simulation is not yet on the same footing as the simulation evidence.

major comments (4)
  1. [IV.A and Figure 6] The central interpretation rests on a speculative identification of the high-frequency process as the boson peak. The text states that the process is 'speculatively identified' and that the authors have an 'inability to directly observe the boson peak in this work.' The quantitative reconstruction in Figure 6 imports the boson-peak line shape from glycerol (Ref. 59) and the 34% suppression in stable PVD indomethacin (Ref. 49), and then chooses a 7% recovery of the boson-peak intensity so that the Kramers-Kronig calculation reproduces the measured 2% rise in χ'. This is a fit, not a prediction; the agreement of Figure 6 with the data is built in by construction. The paper itself concedes that 'any process (not necessarily the boson peak) occurring at a frequency greater than 10^5 Hz would be a possible candidate.' Consequently, the abstract and conclusion claim that 'the boson peak recovers more quickly than the transformation of stable glass into supercooled liquid' is not established by the reported measurements.
  2. [II.A and Section III.A] The constant-background subtraction used in the isothermal annealing experiments assumes that the substrate contribution to the dielectric response is time-independent over the full six-hour anneal. The background is taken as the average of a ten-minute baseline measured at the annealing temperature before film deposition, and this constant value is subtracted from all data collected during the anneal. No live reference channel is used during isothermal measurements; the two-channel subtraction is applied only during temperature ramps. A slow drift of the substrate or instrument response over 10^4-10^5 s could produce a monotonic change in χ' of a few percent with negligible change in χ'', comparable to the reported effect. A control experiment without a film, or simultaneous monitoring of the covered electrode pair during the anneal, is needed to exclude this artifact.
  3. [Section III.A, Figure 2] The key experimental result—a roughly 2% increase in the normalized storage susceptibility at 20 Hz for the 0.80Tg and 0.85Tg glasses with no change in loss—is presented without error bars, replicate runs, or a statistical test. Figure 2 and Supplemental Figure 8 show single traces for each deposition temperature, and the text does not quantify the run-to-run scatter. Given the small magnitude of the effect, the reader cannot assess whether the reported 'significant' increases exceed experimental uncertainty. The same lack of uncertainty reporting applies to the null changes in χ'' and in the onset temperature, which are central to the interpretation.
  4. [IV.B and Figure 8] The simulation null result is not demonstrated to be sensitive to the small boson-peak recovery inferred in the experiment. The authors state that 'any modification of the glass would affect the peak near t ~ 0.5 or the height of the plateau' in the mean-squared displacement, but the MSD is an integral over the vibrational density of states, and a 7% recovery of the boson-peak intensity (the value used in the experimental reconstruction) would change the MSD plateau by an amount that may be far smaller than the scatter among the curves in Figure 8. Without a quantitative sensitivity estimate (for example, the expected change in the MSD plateau or the Debye-Waller factor for the experimental 7% boson-peak recovery, compared with the numerical noise), the simulation's 'no softening' conclusion does not directly contradict the experimental observation, and the paper's central 'contrast between experiment and simulation' is not established on the simulation side either.
minor comments (6)
  1. [Throughout] Equation numbering is duplicated: the TNM equation in Section IV.C is labeled Eq. (1), but Eq. (1) is already used for the mean-squared displacement in Section II.B. The later equation should be renumbered.
  2. [II.A] The spectral range '105 Hz to 100 Hz' should be written as 10^5 Hz to 10^2 Hz (or, if intended literally, '100 Hz to 10^5 Hz' with superscript notation); the current notation is ambiguous.
  3. [III.B and Supplemental Figure 9] The estimated transformation time of the 0.80Tg glass at 0.98Tg is quoted as roughly 10^6 s in the main text, while Supplemental Figure 9 states 'almost 250 ks'; these differ by a factor of four and should be reconciled.
  4. [IV.A and III.B] The supplemental-figure cross-references are inconsistent: Section IV.A cites Supplemental Figure 8 for the ~10^6 s rejuvenation time, but this estimate is presented with Supplemental Figure 9 in Section III.B; Supplemental Figure 8 contains the second-frequency annealing data.
  5. [IV.B] The experimental temperature upjump is described as 'roughly 10%', but the ratio 0.98Tg/0.80Tg corresponds to an increase of about 22%; the basis for the 10% figure should be stated.
  6. [SI, van Hove figure] The caption for the supplemental van Hove function is labeled 'Figure 1' instead of 'Supplemental Figure 10'.

Circularity Check

1 steps flagged · score 6.0 of 10

The boson-peak recovery amplitude is fitted to reproduce the measured χ′ rise, so the experimental interpretation is circular in its quantitative reconstruction.

  1. fitted input called prediction [Section IV.A, Figure 6 reconstruction paragraph]
    "Using these values, we can recreate the 2% increase in the magnitude of χ’ observed at 20 Hz for the longest annealing time for the most stable glass (seen in Figure 2) as shown by the red-dashed “annealed” spectra in Figure 6. The annealed glass spectra has a boson peak intensity that has increased by 7% relative to the stable glass value."

    The 7% boson-peak recovery is not independently measured or predicted; it is chosen so that the reconstructed Figure 6 spectra match the measured 2% increase in χ′. The agreement between the “annealed” reconstruction and experiment is therefore guaranteed by construction and cannot serve as evidence that a boson-peak recovery actually occurred. The paper itself concedes that “any process … occurring at a frequency greater than 105 Hz would be a possible candidate,” and that the boson peak is “speculatively identified.” The imported line shape from glycerol and the 34% suppression from indomethacin are external estimates, but the recovery amplitude—the key quantity—is tuned to the target data.

full rationale

The experimental measurement itself—an increase in χ′ with no corresponding increase in χ″ during annealing of the most stable MMT films—is an honest, self-contained observation, and the Kramers-Kronig inference that some high-frequency process strengthens is mathematically valid. The circular element arises when the paper goes further and identifies the process as boson-peak recovery: the boson-peak line shape is taken from glycerol, the 34% stable-glass suppression from indomethacin, and the 7% recovery is then selected so that the reconstructed spectra reproduce the measured 2% χ′ increase. The agreement is built in rather than predicted. The paper is unusually candid about this—it says it “can recreate” the increase, calls the identification speculative, and notes that any process above 10^5 Hz would produce the same signature—but candor does not remove the issue: the central experimental claim that the boson peak recovers before α rejuvenation rests on a fitted amplitude and imported spectral shapes, not on direct high-frequency data. The swap-Monte-Carlo simulation comparison is independent and non-circular: the MSD and van Hove analyses show no softening of glass-particle dynamics prior to transformation, and that result does not depend on the boson-peak reconstruction. Self-citations to the authors’ earlier simulation work are methodological rather than load-bearing for the new claim. Overall, the quantitative experimental interpretation is partially circular, so a score of 6 is appropriate.

Assumptions & free parameters 7 free parameters · 6 assumptions · 0 invented entities

The central experimental claim rests on the constant-background subtraction assumption, the Kramers-Kronig inference, and a quantitative reconstruction that imports the boson peak suppression from indomethacin and the boson peak spectral shape from glycerol. The recovery fraction (7%) is fitted to the data rather than measured. The simulation comparison adds the assumption that a 2D polydisperse model captures the relevant physics of molecular stable glasses.

free parameters (7)
  • tau_KWW_onset = 1e3 s (0.95Tg), 1e5 s (0.90Tg), 2e7 s (0.85Tg), 2e10 s (0.80Tg)
    Fitted to the onset-temperature aging curves in Figure 5; used to estimate relaxation times at 0.98Tg.
  • tau_KWW_annealing_loss = 3.47e3 s, beta=1.1
    Fitted to the 0.95Tg film loss during annealing (Supplemental Figure 7).
  • boson_peak_suppression = 34% for the stable glass
    Borrowed from indomethacin data (Ref 49) and applied to MMT without direct validation.
  • boson_peak_recovery_fraction = 7% increase relative to stable glass (20% of the way to rejuvenated value)
    Adjusted to reproduce the observed 2% chi' increase in Figure 6.
  • boson_peak_spectral_shape = from glycerol (Ref 59)
    Position and height of the boson peak in the reconstruction are taken from glycerol and assumed unchanged for MMT.
  • TNM_parameters = x=0.32 (literature), tau0 fitted, deltaH_eff from VFT
    Used in Section IV.C to extrapolate relaxation times to deposition temperatures.
  • KWW_beta_onset_fixed = 0.5
    Fixed stretching exponent used for KWW fits of onset temperature aging data.
assumptions (6)
  • standard math Kramers-Kronig relations connect the real and imaginary parts of the dielectric susceptibility; a change in a process above the measurement window can increase chi' without affecting chi'' in the window.
    Used in Section IV.A to interpret the chi' increase as due to a high-frequency process.
  • domain assumption The boson peak is suppressed in stable glasses relative to liquid-cooled glasses, and the degree of suppression in MMT is similar to indomethacin.
    Assumed in Section IV.A based on Refs 49 and 58; no direct measurement of MMT boson peak.
  • domain assumption The 2D polydisperse swap Monte Carlo model is a valid proxy for experimental stable glasses.
    Used throughout Section IV.B; the simulations are on 2D disks, not molecules, which the authors acknowledge may be a limitation.
  • domain assumption The substrate contribution to the dielectric susceptibility is constant during the 6-hour annealing.
    Required for the constant-background subtraction method in Section II.A; no control for drift is reported.
  • domain assumption VFT extrapolation of alpha relaxation time to 0.98Tg is valid for estimating tau_alpha ~1000 s.
    Used in Section III.A to interpret the 0.95Tg film equilibration time.
  • domain assumption TNM model validity for extrapolating relaxation times down to deposition temperatures.
    Used in Section IV.C to estimate relaxation times at deposition temperatures for stable glasses.

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Cite this review

Pith. "Pith review of Initial Stages of Rejuvenation of Vapor-Deposited Glasses during Isothermal Annealing: Contrast Between Experiment and Simulation." pith.science (2026). https://pith.science/paper/L54PCXWN

@misc{pith2026241117540,
  author       = {Pith},
  title        = {Pith review of: Initial Stages of Rejuvenation of Vapor-Deposited Glasses during Isothermal Annealing: Contrast Between Experiment and Simulation},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/L54PCXWN}},
  note         = {Machine review of arXiv:2411.17540}
}
read the original abstract

Physical vapor deposition can prepare organic glasses with high kinetic stability. When heated, these glassy solids slowly transform into the supercooled liquid in a process known as rejuvenation. In this study, we anneal vapor-deposited glasses of methyl-m-toluate (MMT) for six hours at 0.98Tg to observe rejuvenation using dielectric spectroscopy. Glasses of moderate stability exhibited partial or full rejuvenation in six hours. For highly stable glasses, prepared at substrate temperatures of 0.85Tg and 0.80Tg, the six-hour annealing time is ~2% of the estimated transformation time, and no change in the onset temperature for the {\alpha} relaxation process was observed, as expected. Surprisingly, for these highly stable glasses, annealing resulted in significant increases in the storage component of the dielectric susceptibility, without corresponding increases in the loss component. These changes are interpreted to indicate that short-term annealing rejuvenates a high frequency relaxation (e.g., the boson peak) within the stable glass. We compare these results to computer simulations of the rejuvenation of highly stable glasses generated by the swap Monte Carlo algorithm. The in silico glasses, in contrast to the experiment, show no evidence of rejuvenation within the stable glass at times shorter than the alpha relaxation process.

Figures

Figures reproduced from arXiv: 2411.17540 by the authors.

Figure 6
Figure 6. This is a reasonable extent of suppression, as lowering the cooling rate for organic [PITH_FULL_IMAGE:figures/full_fig_p013_6.png] view at source ↗
Figure 2
Figure 2. Supplemental [PITH_FULL_IMAGE:figures/full_fig_p029_2.png] view at source ↗

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Pith tools

Reviewed August 12, 2026 · model on record in the stance chip above.