Correlated electronic phases in twisted bilayer transition metal dichalcogenides

Wang, L.; Shih, E.-M.; Ghiotto, A.; Xian, L. D.; Rhodes, D. A.; Tan, C.; Claassen, M.; Kennes, D. M.; Bai, Y.; Kim, B.; Watanabe, K.; Taniguchi, T.; Zhu, X.; Hone, J.; Rubio, A.; Pasupathy, A.; Dean, C. R.

doi:10.1038/s41563-020-0708-6

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Correlated electronic phases in twisted bilayer transition metal dichalcogenides

MPG-Autoren

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Xian, L. D.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Kennes, D. M.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Institut für Theorie der Statistischen Physik, RWTH Aachen University 52056 Aachen, Germany and JARA-Fundamentals of Future Information Technology;

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Rubio, A.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Computational Quantum Physics, Flatiron Institute;
Nano-Bio Spectroscopy Group, Departamento de Fisica de Materiales, Universidad del País Vasco;

Externe Ressourcen

https://arxiv.org/abs/1910.12147
(Preprint)

https://dx.doi.org/10.1038/s41563-020-0708-6
(Verlagsversion)

https://dx.doi.org/10.1038/s41563-020-0733-5
(Ergänzendes Material)

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Zitation

Wang, L., Shih, E.-M., Ghiotto, A., Xian, L. D., Rhodes, D. A., Tan, C., et al. (2020). Correlated electronic phases in twisted bilayer transition metal dichalcogenides. Nature Materials, 19(8), 861-866. doi:10.1038/s41563-020-0708-6.

Zitierlink: https://hdl.handle.net/21.11116/0000-0005-440B-3

Zusammenfassung

In narrow electron bands in which the Coulomb interaction energy becomes comparable to the bandwidth, interactions can drive new quantum phases. Such flat bands in twisted graphene-based systems result in correlated insulator, superconducting and topological states. Here we report evidence of low-energy flat bands in twisted bilayer WSe₂, with signatures of collective phases observed over twist angles that range from 4 to 5.1°. At half-band filling, a correlated insulator appeared that is tunable with both twist angle and displacement field. At a 5.1° twist, zero-resistance pockets were observed on doping away from half filling at temperatures below 3 K, which indicates a possible transition to a superconducting state. The observation of tunable collective phases in a simple band, which hosts only two holes per unit cell at full filling, establishes twisted bilayer transition metal dichalcogenides as an ideal platform to study correlated physics in two dimensions on a triangular lattice.