Transport properties of proton-irradiated gallium nitride-based two-dimensional electron-gas system
Bibliographic record
Abstract
A two-dimensional electron gas system (2DEG) is formed at the interface when a ternary alloy of aluminum gallium nitride is grown on gallium nitride. Very high carrier density can be achieved in these systems due to the strong piezoelectric and pyroelectric properties of the nitrides. The device was grown by molecular beam epitaxy and magnetron sputtering epitaxy. Through resistivity and Hall effect measurements in the temperature range 2 K to 300 K, its 2DEG conductive character, high mobility, and carrier density properties were confirmed. The effects of 2-MeV proton radiation on these properties are reported for the fluence range 1 /spl times/ 10/sup 13/ to 7 /spl times/ 10/sup 15/ cm/sup -2/. As a result of irradiation, the carrier density decreases by a factor of two whereas the mobility degrades by about a factor of a thousand. A fluence between 3 /spl times/ 10/sup 14/ cm/sup -2/ and 3 /spl times/ 10/sup 15/ cm/sup -2/ is necessary to drive a conductor to insulator transition for this 2-D gas and the change of phase is attributed mainly to changes in the mobility. This change of phase is determined by quantum conditions and could be used to establish an absolute standard for radiation damage.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".