Electronic and optical properties of GaAsN/GaAs quantum wells: A tight-binding study
Bibliographic record
Abstract
We present empirical tight-binding (TB) calculations of the electronic structure of GaAs1−xNx/GaAs (001) quantum wells (QWs) with small N concentrations (0<x<0.045). We use a recently developed TB model for the electronic structure of dilute GaAs1−xNx [Shtinkov et al., Phys. Rev. B 67, 081202R (2003)] without introducing any additional parameters apart from the valence band offset (VBO) between GaAs and GaAs1−xNx. The dependences of the bound states energies on the QW width and on the N concentration x are investigated and the nature of the lowest-energy optical transitions is analyzed, showing that the knowledge of the first two optical transitions is sufficient to determine the value of the VBO. Our results are compared with experimental data from the literature, revealing good agreement for x⩽0.02. For larger concentrations, we find that the agreement is greatly improved if the concentrations determined from x-ray diffraction data are corrected for deviations from Vegard’s rule. The comparison with experimental results suggests that the unstrained GaAs/GaAs1−xNx VBO is close to zero, in agreement with other studies.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".