Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS(2) bilayers

We predict that twisted bilayers of 1T-ZrS(2) realize a novel and tunable platform to engineer two-dimensional topological quantum phases dominated by strong spin-orbit interactions. At small twist angles, ZrS(2) heterostructures give rise to an emergent and twist-controlled moiré Kagome lattice, co...

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Autores principales: Claassen, Martin, Xian, Lede, Kennes, Dante M., Rubio, Angel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9395362/
https://www.ncbi.nlm.nih.gov/pubmed/35995779
http://dx.doi.org/10.1038/s41467-022-31604-w
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author Claassen, Martin
Xian, Lede
Kennes, Dante M.
Rubio, Angel
author_facet Claassen, Martin
Xian, Lede
Kennes, Dante M.
Rubio, Angel
author_sort Claassen, Martin
collection PubMed
description We predict that twisted bilayers of 1T-ZrS(2) realize a novel and tunable platform to engineer two-dimensional topological quantum phases dominated by strong spin-orbit interactions. At small twist angles, ZrS(2) heterostructures give rise to an emergent and twist-controlled moiré Kagome lattice, combining geometric frustration and strong spin-orbit coupling to give rise to a moiré quantum spin Hall insulator with highly controllable and nearly-dispersionless bands. We devise a generic pseudo-spin theory for group-IV transition metal dichalcogenides that relies on the two-component character of the valence band maximum of the 1T structure at Γ, and study the emergence of a robust quantum anomalous Hall phase as well as possible fractional Chern insulating states from strong Coulomb repulsion at fractional fillings of the topological moiré Kagome bands. Our results establish group-IV transition metal dichalcogenide bilayers as a novel moiré platform to realize strongly-correlated topological phases in a twist-tunable setting.
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spelling pubmed-93953622022-08-24 Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS(2) bilayers Claassen, Martin Xian, Lede Kennes, Dante M. Rubio, Angel Nat Commun Article We predict that twisted bilayers of 1T-ZrS(2) realize a novel and tunable platform to engineer two-dimensional topological quantum phases dominated by strong spin-orbit interactions. At small twist angles, ZrS(2) heterostructures give rise to an emergent and twist-controlled moiré Kagome lattice, combining geometric frustration and strong spin-orbit coupling to give rise to a moiré quantum spin Hall insulator with highly controllable and nearly-dispersionless bands. We devise a generic pseudo-spin theory for group-IV transition metal dichalcogenides that relies on the two-component character of the valence band maximum of the 1T structure at Γ, and study the emergence of a robust quantum anomalous Hall phase as well as possible fractional Chern insulating states from strong Coulomb repulsion at fractional fillings of the topological moiré Kagome bands. Our results establish group-IV transition metal dichalcogenide bilayers as a novel moiré platform to realize strongly-correlated topological phases in a twist-tunable setting. Nature Publishing Group UK 2022-08-22 /pmc/articles/PMC9395362/ /pubmed/35995779 http://dx.doi.org/10.1038/s41467-022-31604-w Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Claassen, Martin
Xian, Lede
Kennes, Dante M.
Rubio, Angel
Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS(2) bilayers
title Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS(2) bilayers
title_full Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS(2) bilayers
title_fullStr Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS(2) bilayers
title_full_unstemmed Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS(2) bilayers
title_short Ultra-strong spin–orbit coupling and topological moiré engineering in twisted ZrS(2) bilayers
title_sort ultra-strong spin–orbit coupling and topological moiré engineering in twisted zrs(2) bilayers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9395362/
https://www.ncbi.nlm.nih.gov/pubmed/35995779
http://dx.doi.org/10.1038/s41467-022-31604-w
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