Magnetism and metallicity in moiré transition metal dichalcogenides

Journal Article · 10 January 2024 · Proceedings of the National Academy of Sciences of the United States of America

DOI: https://doi.org/10.1073/pnas.2311486121 · OSTI ID:2281033

Tscheppe, Patrick ^[1]; Zang, Jiawei  ^[2]; Klett, Marcel ^[3]; Karakuzu, Seher ^[4]; Celarier, Armelle ^[5]; Cheng, Zhengqian ^[6]; Marianetti, Chris A. ^[6]; Maier, Thomas A. ^[7]; Ferrero, Michel ^[8]; Millis, Andrew J.  ^[9]; Schäfer, Thomas ^[3]

---

1. Independent Research Group, Max-Planck-Institut für Festkörperforschung, Stuttgart 70569, Germany, Institut für Theoretische Physik and Center for Quantum Science, Universität Tübingen, Tübingen 72076, Germany
2. Department of Physics, Columbia University, New York, NY 10027
3. Independent Research Group, Max-Planck-Institut für Festkörperforschung, Stuttgart 70569, Germany
4. Center for Computational Quantum Physics, Flatiron Institute, New York, NY 10010
5. CPHT, CNRS, École Polytechnique, Institut Polytechnique de Paris, Palaiseau 91128, France
6. Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027
7. Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6164
8. CPHT, CNRS, École Polytechnique, Institut Polytechnique de Paris, Palaiseau 91128, France, Collège de France, Paris 75005, France
9. Department of Physics, Columbia University, New York, NY 10027, Center for Computational Quantum Physics, Flatiron Institute, New York, NY 10010

The ability to control the properties of twisted bilayer transition metal dichalcogenides in situ makes them an ideal platform for investigating the interplay of strong correlations and geometric frustration. Of particular interest are the low energy scales, which make it possible to experimentally access both temperature and magnetic fields that are of the order of the bandwidth or the correlation scale. In this manuscript, we analyze the moiré Hubbard model, believed to describe the low energy physics of an important subclass of the twisted bilayer compounds. We establish its magnetic and the metal–insulator phase diagram for the full range of magnetic fields up to the fully spin-polarized state. We find a rich phase diagram including fully and partially polarized insulating and metallic phases of which we determine the interplay of magnetic order, Zeeman-field, and metallicity, and make connection to recent experiments.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
• Grant/Contract Number: AC05-00OR22725; SC0019443
• OSTI ID: 2281033
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 3 Vol. 121; ISSN 0027-8424
• Publisher: Proceedings of the National Academy of SciencesCopyright Statement
• Country of Publication: United States
• Language: English