Optical response in Weyl semimetal in model with gapped Dirac phase
Bibliographic record
Abstract
, a gap term m and a Zeeman spin-splitting term b with broken time reversal symmetry. Transport is treated within Kubo formalism and particular attention is payed to the modifications that result from a finite m and b. We consider how these modifications change when a finite residual scattering rate [Formula: see text] is included. For [Formula: see text] the A.C. conductivity as a function of photon energy [Formula: see text] continues to display the two quasilinear energy regions of the clean limit for [Formula: see text] below the onset of the second electronic band which is gapped at ([Formula: see text]). For [Formula: see text] of the order m little trace of two distinct linear energy scales remain and the optical response has evolved towards that for [Formula: see text]. Although some quantitative differences remain there are no qualitative differences. The magnitude of the D.C. conductivity [Formula: see text] at zero temperature ([Formula: see text]) and chemical potential ([Formula: see text]) is altered. While it remains proportional to [Formula: see text] it becomes inversely dependent on an effective Fermi velocity out of the Weyl nodes equal to [Formula: see text] which decreases strongly as the phase boundary between Weyl semimetal and gapped Dirac phase (GDSM) is approached at [Formula: see text]. The leading term in the approach to [Formula: see text] for finite [Formula: see text], [Formula: see text] and [Formula: see text] is found to be quadratic. The coefficient of these corrections tracks closely the [Formula: see text] dependence of the [Formula: see text] limit with differences largest near to the WSM-GDSM boundary.
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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) | 0.000 | 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) | 0.000 | 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".