Band Characteristics of a Parity-Time Symmetric Photonic Crystal Made of Multi-Level Atomic Systems
Bibliographic record
Abstract
Partity-time symmetry enables a quantum system or an optical/electromagnetic structure to have real eigenvalue spectra of energy (or wave number). A relatively simple and convenient scenario, which takes advantage of multi-level transition and optical pumping in a four-level atomic system, is suggested in order to achieve parity-time symmetry of such an atomic medium. In the present parity-time symmetric atomic vapor, the real part of the obtained electric permittivity is a constant, and the imaginary part is an odd function (e.g., sine function of spatial coordinate). The optical characteristics of such a parity-time symmetric periodic dielectric have also been studied in this paper. It can be found that the Bloch wave numbers in the present periodic dielectric are purely real or purely imaginary. A threshold in the magnitude of the imaginary part of the parity-time symmetric permittivity for emergence of forbidden band is also indicated in our numerical calculation. The present scenario for realizing parity-time symmetric atomic vapor would find potential applications in some new photonic or quantum optical device design and fabrication.
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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 | 0.000 |
| 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) | 0.001 | 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".