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.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".