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  Ultra-Strong Spin-Orbit Coupling and Topological Moiré Engineering in Twisted ZrS2 Bilayers

Claassen, M., Xian, L. D., Kennes, D. M., & Rubio, A. (2021). Ultra-Strong Spin-Orbit Coupling and Topological Moiré Engineering in Twisted ZrS2 Bilayers.

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2110.13370.pdf (Preprint), 8MB
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2110.13370.pdf
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2021
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https://arxiv.org/abs/2110.13370 (Preprint)
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 Creators:
Claassen, M.1, Author
Xian, L. D.2, 3, 4, Author              
Kennes, D. M.3, 4, 5, Author              
Rubio, A.3, 4, 6, Author              
Affiliations:
1Department of Physics and Astronomy, University of Pennsylvania, ou_persistent22              
2Songshan Lake Materials Laboratory, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Free Electron Laser Science, ou_persistent22              
5Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA-Fundamentals of Future Information Technology, ou_persistent22              
6Center for Computational Quantum Physics, Simons Foundation Flatiron Institute, ou_persistent22              

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Free keywords: Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el, Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Condensed Matter, Materials Science, cond-mat.mtrl-sci
 Abstract: We predict that twisted bilayers of 1T-ZrS2 realize a novel and tunable platform to engineer two-dimensional topological quantum phases dominated by strong spin-orbit interactions. At small twist angles, ZrS2 heterostructures give rise to an emergent and twist-controlled moiré Kagomé 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 Kagomé 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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Language(s): eng - English
 Dates: 2021-10-25
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2110.13370
 Degree: -

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