Optical rectification and current injection in unbiased semiconductors
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Bibliographic record
Abstract
We present a full band-structure calculation of the electronic contribution to the second-order susceptibility in the limit of a sum frequency that vanishes. We give a sum-over-states expression for the optical rectification coefficient ${\ensuremath{\chi}}_{\text{rect}}(\ensuremath{\omega})\ensuremath{\equiv}{\ensuremath{\chi}}_{\text{rect}}(0;\ensuremath{\omega},\ensuremath{-}\ensuremath{\omega})$, which includes intraband contributions. Intraband transitions additionally lead to shift and injection currents, which we identify in the total response and separate from the optical rectification. The approach applies to all crystal classes and over a wide range of applied optical frequencies. We apply our results to a full band-structure calculation of the optical rectification, shift current, and injection current susceptibilities for wurtzite CdS and CdSe.
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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 it