Signatures of Ultrafast Structural Dynamics and Phase Segregation in Photoexcited SnSe
Bibliographic record
Abstract
In this work we use time-resolved multi-terahertz (THz) spectroscopy to observe phonon linewidth and optical conductivity dynamics in the thermoelectric tin selenide (SnSe). At early pump delays (< 0.5 ps), a broadened phonon response is observed near the strongly coupled TO phonon near 3.8 THz in the Peierl’s-distorted Pnma phase. At longer pump delays and scaling with excitation fluence, this phonon narrows, opposite to the typical temperature-induced broadening with additional deposited pump energy and consistent with a restoration of phonon degeneracy expected for a transition towards the more symmetric Immm phase. Additionally, above and below all phonon frequencies, dynamics in the optical conductivity align with our previous work suggesting nucleated domains of metallic surface states, in agreement with recent time-resolved ARPES results.
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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".