Intra- and Inter-Conduction Band Optical Absorption Processes in\n $\\beta$-Ga$_2$O$_3$
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Bibliographic record
Abstract
$\\beta$-Ga$_2$O$_3$ is an ultra-wide bandgap semiconductor and is thus\nexpected to be optically transparent to light of sub-bandgap wavelengths well\ninto the ultraviolet. Contrary to this expectation, it is found here that free\nelectrons in n-doped $\\beta$-Ga$_2$O$_3$ absorb light from the IR to the UV\nwavelength range via intra- and inter-conduction band optical transitions.\nIntra-conduction band absorption occurs via an indirect optical phonon mediated\nprocess with a $1/\\omega^{3}$ dependence in the visible to near-IR wavelength\nrange. This frequency dependence markedly differs from the $1/\\omega^{2}$\ndependence predicted by the Drude model of free-carrier absorption. The\ninter-conduction band absorption between the lowest conduction band and a\nhigher conduction band occurs via a direct optical process at $\\lambda \\sim\n349$ nm (3.55 eV). Steady state and ultrafast optical spectroscopy measurements\nunambiguously identify both these absorption processes and enable quantitative\nmeasurements of the inter-conduction band energy, and the frequency dependence\nof absorption. Whereas the intra-conduction band absorption does not depend on\nlight polarization, inter-conduction band absorption is found to be strongly\npolarization dependent. The experimental observations, in excellent agreement\nwith recent theoretical predictions for $\\beta$-Ga$_2$O$_3$, provide important\nlimits of sub-bandgap transparency for optoelectronics in the deep-UV to\nvisible wavelength range, and are also of importance for high electric field\ntransport effects in this emerging semiconductor.\n
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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 | 0.001 |
| Research integrity | 0.001 | 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