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arxiv: 2604.21336 · v1 · submitted 2026-04-23 · ❄️ cond-mat.str-el

Pressure-Tuned Competing Electronic States in Layered Tellurides

Mahmoud Abdel-Hafiez , Govindaraj Lingannan , D. A. Chareev , A. N. Vasiliev , Anas Abutaha , Kadir Can Dogan , Mehmet Yagmurcukardes , Mehmet Egilmez
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Hasan Sahin Sami El-Khatib
This is my paper

Pith reviewed 2026-05-08 14:14 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords 2H-MoTe2magnetotransporthydrostatic pressurevariable-range hoppingweak localizationweak antilocalizationbandgap collapselayered tellurides
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The pith

Hydrostatic pressure suppresses insulation in 2H-MoTe2 and drives a crossover from variable-range hopping to quantum interference transport.

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

The paper studies how hydrostatic pressure alters electron motion in the layered semiconductor 2H-MoTe2. At zero pressure the material shows metallic conduction at high temperature that crosses over to activated behavior and then to strongly localized variable-range hopping at low temperature, together with large nonsaturating magnetoresistance. Compression to 15.6 GPa eliminates the insulating state and produces a low-resistivity regime in which quantum interference effects appear, including a low-temperature crossover from weak antilocalization to weak localization. A single phenomenological model accounts for the magnetoresistance in both the localized and coherent regimes and returns comparable electronic length scales; first-principles calculations show the gap closes continuously into a semimetallic band structure.

Core claim

The central claim is that hydrostatic pressure continuously collapses the bandgap of bulk 2H-MoTe2, rapidly eliminating the variable-range hopping regime and revealing a metallic-like state governed by quantum interference. In this state a crossover from weak antilocalization to weak localization occurs at low temperature, while a physically motivated phenomenological description reproduces the observed magnetoresistance and yields an electronic length scale that stays roughly constant from the hopping regime through the coherent regime. Density-functional calculations confirm the gap closure and the resulting semimetallic electronic structure.

What carries the argument

The pressure-driven continuous bandgap collapse that switches conduction from activated and variable-range hopping to a quantum-interference regime, together with the phenomenological model that fits the magnetoresistance and extracts a consistent electronic length scale across both regimes.

If this is right

  • The insulating state disappears above a modest pressure threshold, allowing quantum-coherent transport to dominate.
  • Large nonsaturating magnetoresistance at ambient pressure gives way to weak antilocalization and weak localization under compression.
  • The extracted electronic length scale remains comparable, indicating that the underlying disorder or scattering mechanism persists across the regimes.
  • First-principles results link the transport change directly to the closing of the bandgap into a semimetallic structure.

Where Pith is reading between the lines

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

  • The same pressure-tuning approach could be applied to other layered tellurides or transition-metal dichalcogenides to access analogous hopping-to-coherent crossovers.
  • The persistence of a single length scale suggests that disorder effects remain relevant even after the gap closes, which could be tested by combining pressure with controlled disorder.
  • Device applications that exploit pressure as a knob to switch between high-resistance hopping and low-resistance coherent states become conceivable in similar layered materials.

Load-bearing premise

The phenomenological model captures the magnetoresistance data across pressure regimes without needing regime-specific adjustments, and the density-functional calculations accurately predict the continuous collapse of the bandgap under pressure.

What would settle it

A measurement showing that the magnetoresistance in the high-pressure regime cannot be described by the same functional form or length-scale parameters used at ambient pressure, or an observation of an abrupt jump in resistivity rather than continuous suppression, would falsify the unified picture.

Figures

Figures reproduced from arXiv: 2604.21336 by Anas Abutaha, A. N. Vasiliev, D. A. Chareev, Govindaraj Lingannan, Hasan Sahin, Kadir Can Dogan, Mahmoud Abdel-Hafiez, Mehmet Egilmez, Mehmet Yagmurcukardes, Sami El-Khatib.

Figure 1
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Figure 2
Figure 2. Figure 2: FIG. 2 view at source ↗
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Figure 1. Figure 1: FIG. 1 view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 view at source ↗
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Figure 3. Figure 3: FIG. 3 view at source ↗
read the original abstract

Layered transition-metal dichalcogenides (TMDs) host competing electronic states that can be tuned by external perturbations, providing a platform to explore the interplay between disorder, electronic structure, and quantum transport. Here we investigate magnetotransport in bulk semiconducting 2H-MoTe2 under hydrostatic pressure. At ambient pressure, transport evolves from high-temperature metallic behavior into activated conduction and ultimately a strongly localized variable-range hopping regime, accompanied by a pronounced magnetotransport anomaly near 45 K and large, nonsaturating magnetoresistance extending up to an unprecedented field of 60 T in semiconducting 2H-MoTe2. Under compression to 15.6 GPa, the insulating state is rapidly suppressed and a low-resistivity regime emerges in which quantum interference dominates, exhibiting a crossover from weak antilocalization (WAL) to weak localization (WL) at low temperatures. A physically motivated phenomenological description captures the magnetoresistance across these regimes and yields a characteristic electronic length scale that remains comparable across the localized and quantum-interference regimes. First-principles calculations reveal a continuous pressure-driven collapse of the bandgap into a semimetallic electronic structure. These results establish a unified picture of pressure-tuned transport spanning hopping and quantum-coherent regimes.

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 reports magnetotransport measurements on bulk semiconducting 2H-MoTe2 under hydrostatic pressure. At ambient pressure the system evolves from high-temperature metallic behavior to activated conduction and variable-range hopping, accompanied by large nonsaturating magnetoresistance up to 60 T. Under compression to 15.6 GPa the insulating state is suppressed and a low-resistivity regime emerges in which quantum interference dominates, with a crossover from weak antilocalization to weak localization. A physically motivated phenomenological model is shown to capture the magnetoresistance across both the hopping and quantum-coherent regimes, yielding a characteristic electronic length scale that remains comparable. Complementary DFT calculations indicate a continuous pressure-driven collapse of the bandgap into a semimetallic structure. The authors conclude that these results establish a unified picture of pressure-tuned transport spanning hopping and quantum-coherent regimes.

Significance. If the phenomenological model is shown to be applied with fixed functional form and without regime-specific adjustments, and if the extracted length scale is robustly comparable, the work would be significant for demonstrating continuous tuning between strongly localized and quantum-coherent transport in a single layered telluride. The combination of high-field (60 T) data at ambient pressure with high-pressure quantum-interference measurements is experimentally valuable, and the DFT results provide a consistent electronic-structure anchor for the observed suppression of insulation.

major comments (2)
  1. [Results section describing the phenomenological MR model] The unification claim rests on the phenomenological magnetoresistance model yielding a comparable characteristic electronic length scale across the VRH regime (ambient pressure) and the WAL/WL regimes (high pressure). The manuscript must explicitly state the model equation, demonstrate that the same functional form and parameter constraints are used in all regimes, and show that no additional free parameters are introduced post-hoc for individual datasets; otherwise the reported comparability may be an artifact of fitting choices rather than evidence of a unified physical picture.
  2. [Data analysis and fitting subsection] No uncertainty estimates, error bars, or goodness-of-fit metrics are provided for the extracted characteristic length scale. Without these, it is impossible to assess whether the lengths reported as 'comparable' across regimes are statistically consistent or whether differences fall within fitting uncertainties.
minor comments (2)
  1. [Abstract] The abstract states 'unprecedented field of 60 T in semiconducting 2H-MoTe2'; this should be qualified to clarify the precise sense in which the field range is unprecedented.
  2. [DFT calculations] The DFT section would benefit from a supplementary figure showing the pressure evolution of the calculated band structure or density of states to visually support the continuous bandgap collapse.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for the constructive comments. We appreciate the positive assessment of the experimental approach combining high-field ambient-pressure data with high-pressure quantum-interference measurements. We address the two major comments below and have revised the manuscript to strengthen the presentation of the phenomenological model and the fitting analysis.

read point-by-point responses

  1. Referee: [Results section describing the phenomenological MR model] The unification claim rests on the phenomenological magnetoresistance model yielding a comparable characteristic electronic length scale across the VRH regime (ambient pressure) and the WAL/WL regimes (high pressure). The manuscript must explicitly state the model equation, demonstrate that the same functional form and parameter constraints are used in all regimes, and show that no additional free parameters are introduced post-hoc for individual datasets; otherwise the reported comparability may be an artifact of fitting choices rather than evidence of a unified physical picture.

    Authors: We agree that the unification claim requires explicit documentation of the model to avoid any ambiguity. In the revised manuscript we will insert the full functional form of the phenomenological magnetoresistance expression in the Results section. We will demonstrate that this identical functional form, together with the same set of parameter constraints, is applied uniformly to the ambient-pressure VRH data and to the high-pressure WAL/WL data. The fitting protocol will be described in sufficient detail to confirm that no regime-specific adjustments or additional free parameters were introduced after the initial model selection. With these clarifications the reported comparability of the characteristic length scale will rest on a single, consistently applied description rather than on post-hoc fitting choices. revision: yes

  2. Referee: [Data analysis and fitting subsection] No uncertainty estimates, error bars, or goodness-of-fit metrics are provided for the extracted characteristic length scale. Without these, it is impossible to assess whether the lengths reported as 'comparable' across regimes are statistically consistent or whether differences fall within fitting uncertainties.

    Authors: We acknowledge the omission of quantitative uncertainty information in the current version. In the revised manuscript we will report error bars on all extracted characteristic length scales, obtained from the covariance matrix of the nonlinear least-squares fits. We will also include goodness-of-fit metrics (reduced chi-squared and R-squared) for each dataset. These additions will allow readers to evaluate directly whether the length scales remain statistically consistent across the VRH and WAL/WL regimes within the reported uncertainties. revision: yes

Circularity Check

1 steps flagged

Phenomenological MR model unifies regimes only if length-scale extraction is independent of fitting choices

specific steps
  1. fitted input called prediction [Abstract]
    "A physically motivated phenomenological description captures the magnetoresistance across these regimes and yields a characteristic electronic length scale that remains comparable across the localized and quantum-interference regimes."

    The length scale is a fitted parameter extracted from the same magnetoresistance datasets in each regime. Stating that it 'remains comparable' is therefore an output of the fitting procedure applied to the input curves rather than a prediction or derivation independent of those fits.

full rationale

The paper's unification claim rests on a single phenomenological model applied to magnetoresistance data from ambient pressure (VRH) through high-pressure (WAL/WL) regimes. The characteristic electronic length scale is obtained directly from fits to that data and reported as remaining comparable. This introduces moderate dependence on model form and parameter choices, but the raw resistivity curves, temperature dependence, and separate DFT bandgap calculations supply independent anchors. No self-citation chain or self-definitional loop is present; the central result retains external content from experiment and computation.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

Abstract-only review limits visibility; the phenomenological model and DFT interpretation rest on standard assumptions whose details are not shown.

free parameters (1)
  • characteristic electronic length scale
    Derived from phenomenological fit to magnetoresistance data and stated to remain comparable across regimes.
axioms (1)
  • domain assumption First-principles calculations correctly capture pressure-induced bandgap closure.
    Invoked to interpret the transition to semimetallic structure.

pith-pipeline@v0.9.0 · 5576 in / 1243 out tokens · 73999 ms · 2026-05-08T14:14:30.342262+00:00 · methodology

discussion (0)

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Reference graph

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