Two-dimensional electrons at mirror and twistronic twin boundaries in van der Waals ferroelectrics
| Autor: | James G. McHugh, Xue Li, Isaac Soltero, Vladimir I. Fal’ko |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Nature Communications, Vol 15, Iss 1, Pp 1-7 (2024) |
| Druh dokumentu: | article |
| ISSN: | 2041-1723 73731498 |
| DOI: | 10.1038/s41467-024-51176-1 |
| Popis: | Abstract Semiconducting transition metal dichalcogenides (MX2) occur in 2H and rhombohedral (3R) polytypes, respectively distinguished by anti-parallel and parallel orientation of consecutive monolayer lattices. In its bulk form, 3R-MX2 is ferroelectric, hosting an out-of-plane electric polarisation, the direction of which is dictated by stacking. Here, we predict that twin boundaries, separating adjacent polarisation domains with reversed built-in electric fields, are able to host two-dimensional electrons and holes with an areal density reaching ~ 1013cm−2. Our modelling suggests that n-doped twin boundaries have a more promising binding energy than p-doped ones, whereas hole accumulation is stable at external surfaces of a twinned film. We also propose that assembling pairs of mono-twin films with a ‘magic’ twist angle θ * that provides commensurability between the moiré pattern at the interface and the accumulated carrier density, should promote a regime of strongly correlated states of electrons, such as Wigner crystals, and we specify the values of θ * for homo- and heterostructures of various TMDs. |
| Databáze: | Directory of Open Access Journals |
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