Resonant Brillouin Scattering of Exciton-Polaritons in β-ZnP<sub>2</sub>
Bibliographic record
Abstract
The secondary emission spectra of β-ZnP 2 under the resonant excitation in the 1 s exciton region were investigated in detail. Several scattering lines with the Stokes shifts of less than 6 meV were found. By analyzing the experimental results using a model based on the exciton-polariton picture, we attributed the observed scattering lines to the Brillouin lines. The sound velocities of the LA and TA phonons were derived to be v LA =4.8 (±0.2)×10 5 cm/s and v TA =2.8 (±0.2)×10 5 cm/s, respectively. The resonant enhancement of the Brillouin lines was observed around the transverse exciton energy E T , which reflects high transmissivity and a small group velocity of the exciton-polaritons at E T . We also found that the Rayleigh scattering line was resonantly enhanced between the longitudinal exciton energy E L and E T due to the surface roughness, which explains the drastic reduction of the luminescence from the lower branch polaritons in intensity reported earlier. The excitation energy dependence of the Brillouin line width is also discussed.
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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 | 0.001 |
| 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".