THz emission from coherently controlled currents in GaAs
Bibliographic record
Abstract
Summary form only given. Coherence control (CC) makes use of the phase of optical beams to alter the properties of matter via interference of quantum mechanical pathways. Earlier it was shown that CC electrical currents can be generated in GaAs and LT-GaAs at 295 K by interfering single and two photon transition amplitudes coupling the same valence and conduction band states. The current temporal profile is expected to follow the optical pulse envelope before decaying to zero on a subpicosecond time scale due to relaxation effects. However. previously time-integrated photocurrents were measured using a train of femtosecond pulses and a metal-semiconductor-metal charge collector. We report observation of THz radiation from the transient currents. CC currents permit tailoring of THz radiation through the bandwidth of optical pulses, e.g., producing single cycle high frequency radiation and overcoming limitations of biased antenna emitters. The radiation is also a diagnostic of intraband coherence dynamics of nonequilibrium carriers.
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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".