Multidimensional Fourier spectroscopy of semiconductors. II. Decoherence effects
Bibliographic record
Abstract
We study decoherence between the states of optically excited excitons embedded in an electron gas and compare it to the decoherence between the excitons and the ground state. The problem is examined within the context of two-dimensional Fourier spectroscopy using the formalism discussed in the first paper of this series [K. S. Virk and J. E. Sipe, Phys. Rev. B 80, 165318 (2009)]. Two-time correlation functions for excitons are constructed and a dynamical equation describing their evolution is derived. The equation is compared to the corresponding equation for the interband polarization. It is argued, and verified by numerical calculation, that the decay of Raman coherence between exciton states is much slower than the decay of interband polarization and that it depends explicitly on how differently the superimposed exciton states interact with modes of the electron gas. The equations are generally non-Markov. Numerical results are obtained for a simple model of low-energy excitations of a GaAs quantum well.
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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 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".