Optical phonons via oblique-incidence infrared spectroscopy and their deformation potentials in In1−xGaxAs
Bibliographic record
Abstract
The concentration dependence of optical phonons in In1−xGaxAs epilayers grown by chemical beam epitaxy and lattice matched to InP(100), where the epilayer strain is zero for x=0.46809, has been characterized for 0.25<x<0.8 with polarized far infrared reflectivity measurements at an oblique angle of incidence. In this method, the reflectance spectra contain sharp Berreman peaks exactly at the optic phonon frequencies. For radiation polarized in the plane of incidence (p polarized), Berreman peaks for both transverse optic (TO) and longitudinal optic (LO) modes are observed, whereas for s polarization only TO modes are seen. The derivatives of the measured spectra were fitted to Lorentzian line shapes to evaluate the various phonon modes, which included GaAs-like TO and LO phonons, disorder induced TO and LO modes, and InAs-like TO and LO phonons. The concentration dependences of the phonon frequencies were used to estimate the phonon deformation potentials of the bulk alloy. Indirect evidence is obtained for LO mode repulsion at low x values from the concentration dependences of the GaAs-like modes in both strained and bulk In1−xGaxAs and from an unphysical variation with x of the GaAs-like LO phonon deformation potential.
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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 | 0.000 | 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) | 0.000 | 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".