Optical pump-terahertz probe investigation of carrier relaxation in radiation-damaged silicon-on-sapphire
Bibliographic record
Abstract
We use an optical pump - terahertz probe technique to study relaxation dynamics of photoexcited carriers in semiconductors. The optical pump pulse (400/800 nm, 100 fs) from an amplified Ti:sapphire laser generates free carriers within the optical penetration depth of the semiconductor surface, and the transmission of the terahertz (THz) probe pulse is monitored as a function of delay time between pump and probe. In particular, we investigate carrier relaxation dynamics in radiation-damaged silicon-on-sapphire (RD-SOS). We measure pump-induced changes in the transmission of the amplitude of the THz pulse, which proves to be a valid technique for these low-mobility samples due to negligible phase shifts in the transmitted THz pulse. Using a simple thin-film Drude model, single-exponential relaxation times of 4 to 6 ps are observed and transient mobilities of about 420 cm<SUP>2</SUP>/Vs are obtained for moderately damaged RD-SOS> Picosecond carrier relaxation dynamics in high-implant-dose RD-SOS and sub-picosecond transients in amorphous silicon thin films are also observed.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".