Stacking-driven gap formation in layered 1<i>T</i>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>TaS</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>
Why this work is in the frame
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Bibliographic record
Abstract
The layered transition metal dichalcogenides which show an inherent tendency towards charge density wave order are traditionally considered to realize rather two-dimensional electronic systems. However, recent theoretical and experimental results suggest that the stacking of the charge density wave and related orbital order in the direction perpendicular to the layers plays a key role for the in-plane electronic structure. Here we present a state-of-the-art density functional theory (DFT) study which models crucial features of the partially disordered orbital order stacking in the prototypical layered transition metal dichalcogenide 1T-${\mathrm{TaS}}_{2}$. We show that a DFT model with realistic assumptions about the orbital order perpendicular to the layers yields band structures which agree remarkably well with experiments and also correctly predicts the formation of an excitation gap at the Fermi energy. Our results not only imply that the widely accepted paradigm of local Mott physics as the driving mechanism behind the gap formation in 1T-${\mathrm{TaS}}_{2}$ needs to be reconsidered but they also highlight the crucial role of interlayer interactions in layered transition metal dichalcogenides in general.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.045 | 0.011 |
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 it