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arxiv: 2606.17763 · v1 · pith:T7QDOURT · submitted 2026-06-16 · cond-mat.soft

Electronic access to glass transition in supercooled ionic liquids using ambipolar transistor

Tanima Kundu , Rahul Paramanik , Aishee Saha , Shibnath Mandal , Antarik Sarkar , Bipul Karmakar , Subhadeep Datta This is my paper

Reviewed by Pith T0 review T1 audit T2 compute T3 formal T4 kernel 2026-06-26 22:31 UTCgrok-4.3pith:T7QDOURTrecord.jsonopen to challenge →

classification cond-mat.soft
keywords ionic liquidsglass transitionfield-effect transistorrelaxation dynamicssupercooled liquidsambipolar transistorfragile glass formersmobile ion fraction
0
0 comments X

The pith

An ambipolar PdSe₂ transistor electrically tracks the fraction of mobile ions in supercooled ionic liquids as they approach the glass transition.

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

The paper establishes that transfer-curve hysteresis and current transients in an ambipolar PdSe₂ field-effect transistor can be mapped to p_eq(T), the fraction of mobile ions that relax within the experimental timescale. This quantity reveals a non-Arrhenius fragile slowdown and a sharp collapse as mobile regions fragment into percolating fractal clusters near the glass transition, matching the expected reduction in configurational entropy. The same electrical signals allow semiquantitative extraction of viscosity scaling and the temperatures that mark the ergodic-to-nonergodic crossover. Polymer confinement of the ionic liquid is shown to shift those characteristic temperatures upward. The method operates inside a solid-state device where conventional rheometry cannot be applied.

Core claim

The temperature evolution of hysteresis and time-resolved current transients under ionic-gate pulses maps directly onto p_eq(T), the electrically accessible fraction of mobile ions. Upon cooling, p_eq(T) collapses sharply as dynamically equilibrated liquid regions fragment into percolating fractal clusters, consistent with the entropy reduction predicted for fragile glass formers; this collapse supplies the scaling needed to infer viscosity and the ergodic-to-nonergodic crossover temperatures inside an operating transistor.

What carries the argument

p_eq(T), the fraction of mobile ions able to relax within the experimental timescale, extracted from transfer-curve hysteresis and current transients.

If this is right

  • Viscosity can be scaled with temperature using p_eq(T) data inside the device.
  • Characteristic temperatures for the ergodic-to-nonergodic crossover become extractable from electrical signals.
  • Polymer confinement raises the crossover temperatures, showing the method detects matrix-imposed structural constraints.
  • The approach works in solid-state device geometries where bulk rheometry is impossible.

Where Pith is reading between the lines

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

  • Embedding such transistors in circuits could enable real-time electrical monitoring of local glass transitions in ionic-liquid-based devices.
  • The fractal-cluster description of mobile regions invites direct comparison with percolation models used for other fragile glass formers.
  • The same electrical readout might be adapted to other two-dimensional ambipolar channels to broaden the range of accessible ionic liquids.

Load-bearing premise

Changes in hysteresis and current transients reflect only the physical fraction of mobile ions and are not dominated by interface traps, contact resistance, or non-ionic polarization.

What would settle it

Independent rheological or dielectric measurements on the same ionic liquid that yield a mobile-ion fraction versus temperature differing from the transistor-derived p_eq(T) would falsify the direct mapping.

Figures

Figures reproduced from arXiv: 2606.17763 by Aishee Saha, Antarik Sarkar, Bipul Karmakar, Rahul Paramanik, Shibnath Mandal, Subhadeep Datta, Tanima Kundu.

Figure 1
Figure 1. Figure 1: FIG. 1: (a) Device architecture of an ionic-liquid gated PdSe [PITH_FULL_IMAGE:figures/full_fig_p017_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: Schematic flowchart outlining the combined static and dynamic measurement protocol [PITH_FULL_IMAGE:figures/full_fig_p018_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: (a) Temperature-dependent drain-current transients measured following a negative ionic [PITH_FULL_IMAGE:figures/full_fig_p019_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: (a) Angell plot of viscosity (log [PITH_FULL_IMAGE:figures/full_fig_p020_4.png] view at source ↗
read the original abstract

Relaxation dynamics of supercooled liquids approaching glassy arrest remain a central challenge in integrated electronic architectures, where conventional rheometry becomes incompatible. Here, we demonstrate that an ambipolar PdSe$_2$ field-effect transistor functions as an electrical probe capable of resolving ion-specific relaxation dynamics in fragile ionic glass formers and semiquantitatively inferring rheological parameters within an operating device environment. Temperature evolution of the transfer curve hysteresis and time-resolved current transients under ionic-gate pulse reveal a non-Arrhenius fragile slowdown. We track the continuous reduction of dynamically equilibrated liquid regions approaching the glass transition through an electrically accessible quantity $p_\text{eq}(T)$, quantifying the fraction of the mobile ions able to relax within the experimental timescale. Upon cooling, $p_\text{eq}$ collapses sharply as mobile regions fragment into percolating fractal clusters, consistent with a reduction of configurational entropy predicted for fragile glass formers. This approach enables temperature-dependent scaling of viscosity and extraction of characteristic temperatures marking the ergodic-to-nonergodic crossover, within a solid-state device architecture where conventional rheological characterization is inapplicable. Further, polymer confinement of the ionic liquid shifts these characteristic temperatures upward, demonstrating the sensitivity of this method to structural constraints imposed by the polymer matrix.

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 demonstrates an ambipolar PdSe₂ field-effect transistor as an in-device electrical probe for ion relaxation dynamics in fragile supercooled ionic liquids. By tracking temperature-dependent transfer-curve hysteresis and current transients under ionic-gate pulsing, the authors extract an electrically accessible quantity p_eq(T) that quantifies the fraction of mobile ions able to relax on experimental timescales. They report non-Arrhenius fragile slowdown, a sharp collapse of p_eq(T) near the glass transition consistent with percolation of mobile regions, and extraction of viscosity scaling plus ergodic-to-nonergodic crossover temperatures; polymer confinement is shown to shift these temperatures upward.

Significance. If the direct mapping from electrical transients to p_eq(T) and rheological parameters holds with sub-dominant device artifacts, the approach would enable rheological characterization inside solid-state device architectures where conventional rheometry is incompatible. The method's reported sensitivity to polymer confinement adds practical value for confined ionic-liquid systems in electronics.

major comments (2)
  1. [Abstract and § on p_eq(T) extraction] The central claim that hysteresis width and transient amplitudes map directly to the physical mobile-ion fraction p_eq(T) (and thence to viscosity scaling) is load-bearing, yet the manuscript supplies no quantitative controls or bounds on temperature-dependent device artifacts such as interface traps, contact resistance, or non-ionic polarization. No channel-length scaling, gate-dielectric swap, or equivalent-circuit analysis is described to demonstrate that these contributions remain sub-dominant across the full T-range.
  2. [Results on temperature evolution and viscosity scaling] No error bars, reproducibility metrics, or comparison to independent rheological data are provided for the extracted p_eq(T) curves or the inferred characteristic temperatures (ergodic-to-nonergodic crossover, etc.). This leaves the semiquantitative inference of rheological parameters without a clear uncertainty estimate or external validation.
minor comments (2)
  1. [Abstract] Notation for p_eq(T) should be defined explicitly at first use with the precise experimental timescale on which 'mobile' is defined.
  2. [Figures] Figure captions for transfer curves and transients should state the exact pulse durations, voltage amplitudes, and channel dimensions used.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the positive assessment of the method's potential significance and for the constructive major comments. We address each point below and will revise the manuscript to strengthen the claims where the concerns are valid.

read point-by-point responses

  1. Referee: [Abstract and § on p_eq(T) extraction] The central claim that hysteresis width and transient amplitudes map directly to the physical mobile-ion fraction p_eq(T) (and thence to viscosity scaling) is load-bearing, yet the manuscript supplies no quantitative controls or bounds on temperature-dependent device artifacts such as interface traps, contact resistance, or non-ionic polarization. No channel-length scaling, gate-dielectric swap, or equivalent-circuit analysis is described to demonstrate that these contributions remain sub-dominant across the full T-range.

    Authors: The referee correctly identifies that the manuscript does not present channel-length scaling, gate-dielectric swaps, or a full equivalent-circuit analysis to bound possible artifacts. While the ambipolar PdSe2 channel and the distinct temperature evolution of p-type versus n-type branches provide some internal consistency checks against purely electronic artifacts, these are not quantitative. We will add an equivalent-circuit model, bounds on contact-resistance and trap contributions, and channel-length dependence data in the revised manuscript to demonstrate that ionic polarization remains the dominant contribution. revision: yes

  2. Referee: [Results on temperature evolution and viscosity scaling] No error bars, reproducibility metrics, or comparison to independent rheological data are provided for the extracted p_eq(T) curves or the inferred characteristic temperatures (ergodic-to-nonergodic crossover, etc.). This leaves the semiquantitative inference of rheological parameters without a clear uncertainty estimate or external validation.

    Authors: We agree that the absence of error bars, device-to-device reproducibility statistics, and direct comparison to independent rheological measurements weakens the quantitative claims. The p_eq(T) data were collected on multiple devices, but these statistics were not reported. In the revision we will include error bars (standard deviation across devices and repeated temperature sweeps), reproducibility metrics, and a comparison of the extracted crossover temperatures and viscosity scaling to published rheological data on the same ionic liquids. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental observations map directly to p_eq(T) without self-referential derivation

full rationale

The manuscript is an experimental study that reports measured transfer-curve hysteresis and current transients in a PdSe2 ambipolar FET, from which the authors extract an electrically accessible quantity p_eq(T) defined as the fraction of mobile ions able to relax on the experimental timescale. No equations, fits, or derivations are presented that reduce the target rheological parameters or glass-transition markers back to the same fitted inputs by construction. The central claims rest on direct device measurements rather than any self-definitional loop, fitted-input prediction, or self-citation load-bearing step. The mapping from raw electrical signals to p_eq(T) is presented as an empirical correspondence, not a mathematical identity.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 1 invented entities

The central claim rests on the interpretation that electrical signals map cleanly to p_eq(T) and that its collapse reflects configurational-entropy reduction; these mappings are introduced without independent external benchmarks in the abstract.

invented entities (1)
  • p_eq(T) no independent evidence
    purpose: Electrically accessible quantity quantifying the fraction of mobile ions able to relax within the experimental timescale
    Defined from hysteresis and transient data; no independent evidence outside the electrical measurements is mentioned.

pith-pipeline@v0.9.1-grok · 5774 in / 1315 out tokens · 51929 ms · 2026-06-26T22:31:47.007262+00:00 · methodology

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