Bibliographic record
Abstract
The collective excitation modes of individual single-walled carbon nanotubes are studied theoretically in the nearest-neighbour tight-binding approximation. Umklapp terms are taken into account and local-field effects are studied. Plasmon mode dispersion relations for carbon nanotubes with radius R ∼7 Å are obtained. We report a strong dependence of the plasmon dispersion on the chirality of the carbon nanotubes. In particular, armchair and zigzag tubes have dispersive plasmons, but some of the chiral tubes have essentially dispersionless plasmons. Our results offer an alternative explanation to the origin of the experimentally observed low-energy dispersionless modes found in momentum-dependent EELS experiments. Important differences between a tight-binding model and free electron gas model are discussed and it is shown that some important qualitative features cannot be captured by a free electron gas model. An acoustic plasmon mode is found in all metallic carbon nanotubes, giving support to the experimental findings in Raman scattering.
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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 | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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".