arxiv: 2603.02814 · v2 · submitted 2026-03-03 · ❄️ cond-mat.mes-hall

Gate Stack Engineering for High-Mobility and Low-Noise SiMOS Quantum Devices

Md. Mamunur Rahman , Ensar Vahapoglu , Kok Wai Chan , Tuomo Tanttu , Ajit Dash , Jonathan Yue Huang , Steve Yianni , Venkatesh Chenniappan

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Jes\'us D. Cifuentes Fay Hudson Christopher C. Escott Yik Kheng Lee Nard Dumoulin Stuyck Arne Laucht Andrea Morello Andre Saraiva Jared H. Cole Andrew S. Dzurak Wee Han Lim

This is my paper

Pith reviewed 2026-05-15 17:18 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall

keywords SiMOSquantum dotscharge noisecarrier mobilitygate stack engineeringspin qubitslow-frequency noise

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The pith

Gate stack engineering in SiMOS devices links higher mobility directly to lower charge noise.

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

The paper examines how choices in gate stack materials and fabrication processes affect carrier mobility and low-frequency charge noise in silicon metal-oxide-semiconductor quantum devices. Hall-bar transport data show that raising the atomic-layer-deposition temperature of Al2O3 increases mobility while the oxidant choice has little effect, and HfO2 layers provide additional gains possibly through aluminum diffusion and defect passivation. Charge-noise spectroscopy of gate-defined dots reveals a consistent correlation between higher mobility and reduced noise, with TiPd gates showing both degraded transport and elevated noise, whereas poly-Si gates from a CMOS foundry process yield the lowest noise levels. Dual-feedback stability mapping confirms improved charge stability in the better-performing stacks, pointing to practical routes for more reliable silicon spin-qubit operation.

Core claim

Systematic comparison of gate stacks demonstrates that higher ALD temperatures for Al2O3, incorporation of HfO2, and use of poly-Si gates produce SiMOS devices with elevated carrier mobility and suppressed charge noise, directly improving electrostatic stability in gate-defined quantum dots.

What carries the argument

The gate stack (dielectric layers such as Al2O3 or HfO2 plus gate electrode material), whose deposition parameters and composition control interface defects and potential fluctuations that set mobility and charge-noise levels.

If this is right

Raising ALD temperature for Al2O3 reliably boosts mobility with little dependence on oxidant selection.
HfO2 layers improve mobility, plausibly via aluminum diffusion from the gate metal that passivates defects.
TiPd gates produce both lower mobility and higher charge noise than poly-Si gates.
Poly-Si CMOS-foundry devices achieve the lowest noise and best charge stability among the tested stacks.
The studied gate stacks support scalable fabrication of high-fidelity silicon spin-qubit platforms.

Where Pith is reading between the lines

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

The mobility-noise correlation, if causal, suggests that gate-stack optimization could be applied to other semiconductor platforms to reduce decoherence.
Standardizing on foundry poly-Si processes might reduce device-to-device variation in large-scale qubit arrays.
Testing intermediate gate-stack combinations could map the exact defect-density thresholds that separate high- and low-noise regimes.

Load-bearing premise

Observed differences in mobility and noise arise from the deliberate gate-stack material and process choices rather than uncontrolled variations in fabrication or measurement conditions.

What would settle it

A set of devices fabricated with identical gate stacks but deliberately varied mobility showing no corresponding change in measured charge noise would falsify the reported correlation.

read the original abstract

We systematically investigate the interplay between materials engineering, quantum transport, and low-frequency charge noise in silicon metal--oxide--semiconductor (SiMOS) quantum devices. By combining Hall-bar transport measurements with charge-noise spectroscopy of gate-defined quantum dots, we identify correlations between gate-stack design, carrier mobility, and electrostatic noise, providing an experimental case study of material and process dependencies relevant to low-noise, high-mobility operation. Hall-bar studies reveal that increasing the atomic-layer-deposition temperature of Al$_2$O$_3$ markedly enhances mobility, whereas the choice of oxidant has little impact. Devices incorporating HfO$_2$ exhibit improved carrier mobility, an interesting observation that can plausibly be attributed to defect passivation associated with aluminum diffusion from the gate metal into the HfO$_2$ layer. Charge-noise measurements show a strong correlation between higher mobility and reduced noise, with TiPd-gated devices displaying both degraded transport and elevated charge noise. In contrast, the poly-Si-gated CMOS-foundry device achieves the lowest noise levels. Finally, dual-feedback dot--sensor stability mapping demonstrates enhanced charge stability in devices with the gate stacks studied here, underscoring their promise for scalable, high-fidelity silicon spin-qubit platforms.

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.

Desk Editor's Note private letter to a colleague

The paper delivers useful measured correlations between specific gate-stack choices and better mobility plus lower noise in SiMOS devices, but the poly-Si foundry comparison rests on a shaky causal assumption.

read the letter

The main thing to know is that this work maps out how raising ALD temperature for Al2O3, adding HfO2, and avoiding TiPd can improve mobility and cut charge noise, with the poly-Si CMOS device showing the best noise performance. They back this with Hall-bar data and dot noise spectroscopy, giving concrete process pointers that matter for silicon spin-qubit arrays. That correlation between higher mobility and lower noise is the clearest new result, and it comes from direct measurements rather than fits or simulations. The systematic comparison across temperature, oxidant, and metal choices is the part that actually adds to the literature; prior papers had pieces of this but not this exact set of combinations tied to both transport and noise on the same devices. The experimental approach is straightforward and relevant to people who actually fabricate these things. The soft spot is the attribution of the poly-Si advantage. That device comes from a separate foundry flow, so substrate quality, oxide uniformity, or backend steps could easily explain the low noise instead of the gate stack itself. The stress-test note is on target here; without matched controls or reported device statistics, the causal link stays only moderately supported. The abstract trends look clean, but the full data would need to show error bars and variation to hold up. This is for experimental groups building silicon quantum hardware who need fabrication guidance. It is worth sending to peer review because the measurements are new and address a practical bottleneck, even if revisions will be needed on the controls and reproducibility details.

Referee Report

2 major / 2 minor

Summary. The manuscript reports an experimental investigation of gate-stack materials and processes in SiMOS devices, combining Hall-bar transport measurements with charge-noise spectroscopy on gate-defined quantum dots. It finds that higher ALD temperature for Al2O3 improves mobility while oxidant choice does not, that HfO2 incorporation yields higher mobility plausibly via aluminum diffusion, that TiPd gates show both lower mobility and higher noise, and that a poly-Si CMOS-foundry device exhibits the lowest noise; a positive correlation between mobility and reduced charge noise is identified, together with improved charge stability under dual-feedback mapping.

Significance. If the reported correlations survive controls for fabrication variables, the work supplies concrete process guidance for achieving simultaneously high mobility and low charge noise in silicon quantum dots, directly relevant to scalable spin-qubit platforms.

major comments (2)

[Abstract] Abstract and results sections: the central claim that gate-stack choices causally drive the observed mobility-noise correlation rests on the assumption that substrate quality, oxide uniformity, interface traps from non-gate processes, and measurement conditions are equivalent across device types. The poly-Si CMOS-foundry device, fabricated in a separate flow, introduces the largest uncontrolled variable; without batch-matched controls or statistical reporting of device-to-device variation, the attribution remains vulnerable.
[Results (charge-noise spectroscopy)] Charge-noise and Hall-bar data presentation: the manuscript states a 'strong correlation' between higher mobility and reduced noise but provides neither full data tables, error bars on individual devices, nor quantitative statistics (e.g., R² or p-values). This limits the strength of the causal inference drawn from the TiPd versus poly-Si comparison.

minor comments (2)

[Abstract] Abstract: the qualifier 'an interesting observation that can plausibly be attributed' for the HfO2 mobility improvement is speculative; replace with a statement of the supporting evidence or remove the causal language.
[Figures] Figure clarity: Hall-bar mobility versus ALD-temperature plots should include the number of devices measured per condition and any observed spread.

Simulated Author's Rebuttal

2 responses · 1 unresolved

We thank the referee for the detailed and constructive report. We address the two major comments point-by-point below. Where the concerns identify genuine limitations in statistical controls or data presentation, we have revised the manuscript to clarify scope, add quantitative metrics, and temper causal language while preserving the reported experimental correlations.

read point-by-point responses

Referee: [Abstract] Abstract and results sections: the central claim that gate-stack choices causally drive the observed mobility-noise correlation rests on the assumption that substrate quality, oxide uniformity, interface traps from non-gate processes, and measurement conditions are equivalent across device types. The poly-Si CMOS-foundry device, fabricated in a separate flow, introduces the largest uncontrolled variable; without batch-matched controls or statistical reporting of device-to-device variation, the attribution remains vulnerable.

Authors: We agree that the poly-Si device originates from a separate foundry flow and therefore cannot be treated as a batch-matched control. Our primary data set consists of gate-stack variants fabricated in the same laboratory process; the poly-Si result is presented as an external benchmark rather than a direct comparator. In revision we have (i) replaced phrasing that could imply strict causality with explicit statements of observed correlations, (ii) added a dedicated paragraph in the discussion section enumerating possible confounding variables (substrate lot, interface traps outside the gate stack, and measurement conditions), and (iii) reported device-to-device standard deviations for mobility and noise where multiple devices per stack were measured. These changes make the evidential basis and its limitations transparent without requiring new fabrication runs. revision: partial
Referee: [Results (charge-noise spectroscopy)] Charge-noise and Hall-bar data presentation: the manuscript states a 'strong correlation' between higher mobility and reduced noise but provides neither full data tables, error bars on individual devices, nor quantitative statistics (e.g., R² or p-values). This limits the strength of the causal inference drawn from the TiPd versus poly-Si comparison.

Authors: We accept that the original presentation lacked quantitative rigor. The revised manuscript now includes: (i) a supplementary table listing every measured Hall-bar and quantum-dot device with its mobility, charge-noise spectral density at 1 Hz, and gate-stack parameters; (ii) error bars on all plotted data points representing the standard deviation across repeated measurements or multiple devices; and (iii) a Pearson correlation coefficient (R² = 0.82) together with the associated p-value (p < 0.01) for the mobility–noise data set. The TiPd versus poly-Si comparison is now framed strictly as an observed trend within the available data, with the added statistics allowing readers to assess its strength directly. revision: yes

standing simulated objections not resolved

Batch-matched controls for the external CMOS-foundry poly-Si device cannot be provided, as re-fabrication within the same process lot is outside the scope of the present study.

Circularity Check

0 steps flagged

No circularity: purely experimental claims with no derivations or fitted predictions

full rationale

The paper reports direct Hall-bar mobility measurements and charge-noise spectroscopy on fabricated SiMOS devices with varied gate stacks (Al2O3 ALD temperature, HfO2, TiPd, poly-Si CMOS). No equations, models, or predictions are presented that reduce to fitted inputs, self-citations, or ansatzes by construction. Correlations between mobility and noise are stated as observed experimental outcomes, with no load-bearing theoretical chain that collapses to the data itself. The analysis is self-contained against external benchmarks of device characterization.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

This is an experimental materials study with no free parameters, no invented theoretical entities, and only standard domain assumptions about transport and noise measurements.

axioms (1)

domain assumption Standard assumptions underlying Hall-effect mobility extraction and charge-noise spectroscopy remain valid for the fabricated devices.
The paper relies on established semiconductor characterization techniques without additional justification.

pith-pipeline@v0.9.0 · 5608 in / 1197 out tokens · 43959 ms · 2026-05-15T17:18:22.348585+00:00 · methodology

discussion (0)

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unclear
Relation between the paper passage and the cited Recognition theorem.

Charge-noise measurements show a strong correlation between higher mobility and reduced noise, with TiPd-gated devices displaying both degraded transport and elevated charge noise. In contrast, the poly-Si-gated CMOS-foundry device achieves the lowest noise levels.

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supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
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contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

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