(Invited) Van Der Waals Growth and in Situ Studies of Two-Dimensional Pnictogens
Bibliographic record
Abstract
With their ns 2 np 3 electron configuration and sp 3 hybridization, pnictogens (N, P, As, Sb, Bi) form a unique class of elemental van der Waals (vdW) and two-dimensional (2D) materials. The layered allotropes and the wide range of atomic masses span by pnictogens endows them with a broad spectrum of electronic, optical, and topological properties. For instance, few-layer black phosphorus and arsenic have thickness-dependent direct bands spanning the visible and near infrared, as well anisotropic transport properties. On the other hand, 2D-Sb and 2D-Bi are predicted to exhibit several topological phase transitions near atomic thicknesses, as well as a high-mobility single layer semiconducting phase. Despite the important technological potential of 2D pnictogens, stability and synthesis challenges impede their integration in emerging technologies. This talk presents theoretical and real-time electron microscopy studies of the vdW growth and stability of 2D pnictogens [1-6]. The insights obtained from these studies lay the groundwork for the integration of this new class of 2D materials in emerging electronic, optoelectronic, and quantum technologies. References Fortin-Deschênes, H. Zschiesche, T. O. Menteş, A. Locatelli, R. Jacobberger, F. Genuzio, M. J. Lagos, D. Biswas, C. Jozwiak, J. A. Miwa, S. Ulstrup, A. Bostwick, E. Rotenberg, M. S. Arnold, G. A. Botton, O. Moutanabbir. Pnictogens Allotropy and Phase Transformation during van der Waals Growth . Nano Letters. 2020; 20 (11), 8258-8266. Fortin-Deschênes, O. Waller, Q. An, M. J. Lagos, G. Botton, H. Guo, O. Moutanabbir. 2D Antimony-Arsenic Alloys. Small. 2020; 16, 1906540. Fortin-Deschênes, R. M. Jacobberger, C. A. Deslauriers, O. Waller, É. Bouthillier, M. S. Arnold, O. Moutanabbir. D ynamics of Antimonene–Graphene Van Der Waals Growth. Advanced Materials. 2019; 1900569. Fortin-Deschênes, O. Moutanabbir. Recovering the Semiconductor Properties of the Epitaxial Group V 2D Materials Antimonene and Arsenene . The Journal of Physical Chemistry C. 2018; 122 (16), 9162–9168. Fortin-Deschênes, O. Waller, T. O. Mentes, A. Locatelli, S. Mukherjee, F. Genuzio, P. Levesque, A. Hebert, R. Martel, O. Moutanabbir. Synthesis of Antimonene on Germanium . Nano Letters. 2017; 17 (8), 4970–4975. Fortin-Deschênes, P. Levesque, R. Martel, O. Moutanabbir. Dynamics and mechanisms of exfoliated black phosphorus sublimation . The Journal of Physical Chemistry Letters. 2016; 7 (9), 1667-1674.
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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 | 0.001 | 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".