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arxiv: 2604.12313 · v1 · submitted 2026-04-14 · ❄️ cond-mat.supr-con · cond-mat.mes-hall· physics.app-ph

Nanoscale electrothermal-switch superconducting diode for electrically programmable superconducting circuits

Tianyu Li , Jiong Li , Chong Li , Peiyuan Huang , Nuo-Zhou Yang , Wuyue Xu , Wen-Cheng Yue , Yang-Yang Lyu
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Yihuang Xiong Xuecou Tu Tao Tao Xiaoqing Jia Qing-Hu Chen Huabing Wang Peiheng Wu Yong-Lei Wang
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Pith reviewed 2026-05-10 15:30 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.mes-hallphysics.app-ph
keywords superconducting diodeelectrothermal switchnanowirenonreciprocal transportvortex dynamicsprogrammable circuitsrectificationgate control
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The pith

A gate-controlled nanoscale hotspot in a superconducting nanowire creates an electrically tunable diode enabling programmable rectification circuits.

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

The paper demonstrates a superconducting diode where a small gate current generates a local hotspot that breaks inversion symmetry and produces directional current flow. This creates two regimes of nonreciprocal transport, one tied to the superconducting-to-normal transition and the other to vortex motion, both arising from the same process. The diode reaches efficiencies of 42 percent and 60 percent and can be turned on, off, or reversed in polarity using only electrical signals. If the mechanism holds, it provides a way to build superconducting circuits whose rectification functions can be reconfigured on demand without magnetic fields or other external controls.

Core claim

We demonstrate an electrothermal-switch superconducting diode in which a gate-controlled nanoscale hotspot dynamically breaks inversion symmetry in a superconducting nanowire. This mechanism gives rise to two coexisting nonreciprocal transport regimes—one associated with a nonreciprocal superconducting-to-normal transition and the other with ratchet-like vortex dynamics—both originating from the same electrothermal-switch process. The diode exhibits efficiencies up to 42% and 60% for the two regimes, respectively, and can be electrically switched on, off, or reversed in polarity in situ by applying a small gate current. These capabilities enable programmable superconducting circuits that can

What carries the argument

Gate-controlled nanoscale hotspot that dynamically breaks inversion symmetry through the electrothermal-switch process in the superconducting nanowire, producing nonreciprocal transport in two regimes.

Load-bearing premise

The observed nonreciprocal transport originates specifically from the electrothermal-switch process that dynamically breaks inversion symmetry rather than from fabrication artifacts or other unaccounted mechanisms.

What would settle it

Fabricating control devices that cannot form the gate-controlled hotspot or measuring identical nonreciprocal behavior when the hotspot is deliberately suppressed would show that the electrothermal-switch is not the cause.

read the original abstract

Superconducting diodes enable dissipationless directional transport, yet achieving electrical tunability and scalability remains a major challenge for circuit-level integration. Here, we demonstrate an electrothermal-switch superconducting diode in which a gate-controlled nanoscale hotspot dynamically breaks inversion symmetry in a superconducting nanowire. This mechanism gives rise to two coexisting nonreciprocal transport regimes-one associated with a nonreciprocal superconducting-to-normal transition and the other with ratchet-like vortex dynamics-both originating from the same electrothermal-switch process. The diode exhibits efficiencies up to 42% and 60% for the two regimes, respectively, and can be electrically switched on, off, or reversed in polarity in situ by applying a small gate current. These capabilities enable programmable superconducting circuits that realize electrically reconfigurable full-wave and half-wave rectification. The lithography-compatible design, high performance, and gate-controlled functionality establish a scalable platform for programmable superconducting electronics and hybrid quantum systems.

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

1 major / 1 minor

Summary. The manuscript reports the experimental demonstration of an electrothermal-switch superconducting diode in a superconducting nanowire. A gate-controlled nanoscale hotspot is used to dynamically break inversion symmetry, producing two coexisting nonreciprocal transport regimes (one tied to a nonreciprocal superconducting-to-normal transition and the other to ratchet-like vortex dynamics) with efficiencies up to 42% and 60%, respectively. The device can be electrically switched on, off, or polarity-reversed in situ by a small gate current, enabling programmable superconducting circuits that realize reconfigurable full-wave and half-wave rectification.

Significance. If the central attribution to the dynamic electrothermal mechanism holds and the reported efficiencies and switching are robust, this provides a lithography-compatible, scalable platform for electrically programmable superconducting electronics. The dual-regime operation and in-situ gate control would be valuable for circuit-level integration and hybrid quantum systems.

major comments (1)
  1. [Abstract] The headline claim that the observed nonreciprocity (including the 42% and 60% efficiencies and in-situ polarity reversal) originates specifically from the gate-induced nanoscale hotspot dynamically breaking inversion symmetry is load-bearing but insufficiently secured. The manuscript provides no quantitative metrology (e.g., SEM uniformity data) or symmetric control-device measurements to bound static fabrication asymmetries, vortex pinning gradients, or residual flux as alternative sources; without these, the mechanism attribution cannot be isolated from fabrication artifacts.
minor comments (1)
  1. Device dimensions, material (e.g., NbN), gate-current values, and full error-bar/statistical details of the efficiency measurements should be stated explicitly in the main text rather than deferred entirely to supplementary material.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their thorough review and valuable feedback on our manuscript. We address the major comment point by point below and outline the revisions we will make to strengthen the claims regarding the mechanism.

read point-by-point responses

  1. Referee: [Abstract] The headline claim that the observed nonreciprocity (including the 42% and 60% efficiencies and in-situ polarity reversal) originates specifically from the gate-induced nanoscale hotspot dynamically breaking inversion symmetry is load-bearing but insufficiently secured. The manuscript provides no quantitative metrology (e.g., SEM uniformity data) or symmetric control-device measurements to bound static fabrication asymmetries, vortex pinning gradients, or residual flux as alternative sources; without these, the mechanism attribution cannot be isolated from fabrication artifacts.

    Authors: We acknowledge the importance of rigorously excluding static fabrication artifacts to confirm the dynamic electrothermal mechanism. The key evidence supporting the dynamic origin is the in-situ electrical programmability: the diode can be turned on, off, or have its polarity reversed by applying a small gate current. This tunability would not be possible if the nonreciprocity arose from fixed static asymmetries due to fabrication imperfections, vortex pinning gradients, or residual flux, as those are not gate-dependent. The gate current specifically induces the nanoscale hotspot that dynamically breaks the inversion symmetry. To further secure this attribution, we will add quantitative SEM uniformity data in the revised manuscript to characterize the nanowire uniformity and bound potential fabrication asymmetries. While we do not have dedicated symmetric control devices in the current dataset, the gate-controlled switching acts as a built-in control demonstrating the dynamic control. We will also discuss the exclusion of residual flux effects more explicitly in the text. These additions will strengthen the manuscript without altering the core conclusions. revision: partial

Circularity Check

0 steps flagged

No circularity: experimental measurements with no derivational reduction

full rationale

The paper is an experimental report on a fabricated superconducting nanowire device. Reported efficiencies (42% and 60%) are direct measurements of nonreciprocal transport under gate bias; no equations, ansatzes, or fitted parameters are presented that redefine or predict these values from themselves. No self-citation chains are invoked to justify uniqueness theorems or load-bearing premises. The central claim (electrothermal symmetry breaking) is an interpretive attribution of observed data rather than a closed mathematical derivation. This is the expected outcome for a measurement-focused manuscript.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No explicit free parameters, axioms, or invented entities are identifiable from the abstract; the central claims rest on experimental observation of the electrothermal mechanism.

pith-pipeline@v0.9.0 · 5524 in / 1031 out tokens · 53761 ms · 2026-05-10T15:30:56.051833+00:00 · methodology

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Reference graph

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