Engineering photon cascades from multiexciton complexes in a self-assembled quantum dot by a lateral electric field
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Bibliographic record
Abstract
We demonstrate theoretically that by applying an in-plane electric field it is possible to engineer and tune photon cascades originating from recombination of multiexciton complexes confined in self-assembled quantum dots. We find the multiexciton energies and states as functions of the field using the effective-mass configuration-interaction approach with the effects of electron-hole exchange treated perturbatively, and use Fermi's golden rule to compute the emission spectra. We show that the field-induced Stark shift of the energies of photons emitted by the biexciton and two linearly polarized excitons is strongly renormalized by the electron-hole interactions, which are governed by the separation of electrons and holes induced by the field. As a result, the effective Stark shifts of exciton and biexciton emission lines have opposite signs, leading to a removal of the biexciton binding energy at a finite field. This enables the cascade of a pair of polarization entangled photons in the presence of a finite exciton anisotropic exchange splitting. We compare these emission spectra to those of the charged exciton, the triplet biexciton, and the three-exciton complex. We find that the electric field and Coulomb interactions differentiate the biexciton-exciton cascade from other cascades, facilitating identification of its spectra and practical implementation.
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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) | 0.001 | 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