Effects of Bi incorporation on the electronic properties of GaAs: Carrier masses, hole mobility, and Bi‐induced acceptor states
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Bibliographic record
Abstract
Abstract The puzzling electronic and transport properties of the Ga(AsBi) alloy are investigated for a wide range of Bi‐concentrations ( x = 0–10.6%) by means of various experimental techniques in high magnetic fields ( B up to 30 T): magneto‐photoluminescence spectroscopy, magneto‐far‐infrared (FIR) absorption spectroscopy, and Hall effect measurements. Our experimental findings suggest that the strength of hybridization of the continuum states of the valence and conduction bands with the Bi‐related electronic levels depends on the Bi‐concentration, thus leading to band edges with a localized (for x < 6%) or band‐like character (for x > 8%). We report an unusual compositional‐dependence of the exciton reduced mass ( µ exc ), whose value can be larger (for x < 6%) or smaller (for x > 8%) than in GaAs depending on the Bi‐concentration. Correspondingly, the free‐hole mobility ( µ h ) decreases with increasing Bi‐concentration and eventually tends to increase for x > ∼8%. The incorporation of Bi in GaAs also induces the formation of acceptor levels, which we reveal by FIR absorption spectroscopy and Hall effect measurements. The Bi‐induced acceptors are characterized by an exceedingly high value of the effective ground‐state g ‐factor ( g eff ∼ 15) and are responsible for the increasing p ‐type conductivity observed in nominally undoped Ga(AsBi) alloys with increasing Bi‐concentration.
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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)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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