Brillouin scattering studies of quantum van der Waals solids
Bibliographic record
Abstract
Phonons are the most important fundamental collective excitations in condensed matter systems. Understanding the dynamics and interaction of these excitations and their connection to system properties is therefore key to solving some of the most important puzzles in condensed matter physics. Data on long-wavelength acoustic phonons is, however, lacking for most quantum materials, including the countless two-dimensional layered systems displaying new and unexplained phenomena and properties. This is because the energy range in which these excitations reside is inaccessible to the usual experimental probes. In this presentation, we provide an overview of the technique of Brillouin spectroscopy as a versatile and noncontact probe of this class of phonons and present the results of our recent Brillouin scattering experiments on quantum van der Waals solids. These studies will aid in establishing relationships between the elastic, structural, and electronic properties of these systems. [Work partially supported by the Natural Sciences and Engineering Research Council of Canada through a Discovery Grant to Andrews (RGPIN-2024-06345).]
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".