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SASemiAgoraSemiconductor knowledge & engineeringOpen run card

DEVICE REPLAY LAB / SA-DEV-2D-NDR-005

A falling point is not yet negative differential resistance.
Device / Quantum Transport / Metrology

Rectification, consecutive negative slope, peak/valley prominence, gate-controlled overlap, broadening, series/contact burden, forward/reverse history, trap-memory contradiction, mechanism ambiguity, and owned replacement evidence must remain separate.

Open simulationStudy lesson ->
packetSA-DEV-2D-NDR-005runSimulation ObjectlearnEvidence SequencemethodMethodslimitsBoundaries

EVIDENCE SEQUENCE

What the learner should inspect first.

This surface connects the daily-scan source signal to an original SemiAgora simulation object without copying source text, code, figures, PDK files, or process recipes.

01

Start with signed normalized bias and equal-magnitude branch comparison. A rectifying curve can remain non-NDR, so keep the two classifications separate.

Open the run card to inspect the saved rows, methods, limits, and export files behind this step.

Inspect run card ->
02

Hold gate, alignment, broadening, background, contact/series burden, sweep direction, and memory state fixed; read the full 16-point curve rather than one local change.

Open the run card to inspect the saved rows, methods, limits, and export files behind this step.

Inspect run card ->
03

Require at least two consecutive positive-branch negative-slope segments plus declared peak/valley prominence before the stable-NDR proxy passes.

Open the run card to inspect the saved rows, methods, limits, and export files behind this step.

Inspect run card ->
04

Compare the matched return sweep and flag classification, peak-location, or curve-shape disagreement before assigning stability or a transport hypothesis.

Open the run card to inspect the saved rows, methods, limits, and export files behind this step.

Inspect run card ->
05

End at owned signed I-V, gate/temperature, contact, repeatability, uncertainty, and independently reproduced transport evidence rather than a mechanism, device, or application claim.

Open the run card to inspect the saved rows, methods, limits, and export files behind this step.

Inspect run card ->

METHODS

Precomputed model contract.

The goal is useful study scaffolding and paper-planning discipline, not calibrated production evidence.

method

Complete deterministic 16 x 4 x 3 x 2 x 2 x 2 x 2 x 2 Cartesian sweep across signed bias, gate, alignment, broadening, background, series/contact, sweep, and trap-memory states.

The simulation object keeps the same statement beside downloadable JSON and CSV evidence.

method

Original dimensionless monotonic-background plus overlap-window equation with finite-difference slope, consecutive-run, peak/valley, rectification, and matched-sweep checks.

The simulation object keeps the same statement beside downloadable JSON and CSV evidence.

method

Five open primary or preprint-lineage anchors are mapped to nine topic-specific Knowledge Atlas nodes without importing any source coefficient, trace, value, equation, or result.

The simulation object keeps the same statement beside downloadable JSON and CSV evidence.

LIMITS

Useful, but deliberately bounded.

No account, upload, payment, comment, newsletter, live solver, facility workflow, or product-release surface is enabled.

non-claim

No source device stack, geometry, material value, contact, process, bias, temperature, curve, ratio, DFT/NEGF result, equation, fit, circuit, or performance claim is copied into the rows.

Keep this boundary attached when reusing the card for lesson writing, figure planning, or research notes.

non-claim

No DOS integration, transfer-Hamiltonian model, spectral calculation, DFT, NEGF, TCAD, compact model, SPICE, trap kinetics, uncertainty propagation, upload parser, or live server execution.

Keep this boundary attached when reusing the card for lesson writing, figure planning, or research notes.

non-claim

No mechanism proof, material/device ranking, neuromorphic or multivalued-logic advantage, oscillator claim, operating recommendation, fabrication recipe, optimization, qualification, or signoff.

Keep this boundary attached when reusing the card for lesson writing, figure planning, or research notes.

SOURCE ANCHOR

Link-only public source spine.

SemiAgora uses the source as a signal and citation anchor, then writes original summaries and original toy data with explicit limitations.

Open primary 2D heterojunction and resonant-tunneling NDR source spine

https://www.nature.com/articles/s41598-026-68365-1

Open source ->