Magnetism and metallicity in moiré transition metal dichalcogenides

• 成果类型: Article
• 署名作者: Tscheppe, Patrick; Zang, Jiawei; Klett, Marcel; Karakuzu, Seher; Celarier, Armelle; Cheng, Zhengqian; Marianetti, Chris A.; Maier, Thomas A.; Ferrero, Michel; Millis, Andrew J.; Schaefer, Thomas
• 署名单位: Max Planck Society; Eberhard Karls University of Tubingen; Eberhard Karls University of Tubingen; Columbia University; Simons Foundation; Flatiron Institute; Institut Polytechnique de Paris; Ecole Polytechnique; Centre National de la Recherche Scientifique (CNRS); Columbia University; United States Department of Energy (DOE); Oak Ridge National Laboratory; Universite PSL; College de France
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-11423
• DOI: 10.1073/pnas.2311486121
• 发表日期: 2024-01-16
• 关键词: electron correlations; hubbard-model; ferromagnetism; field

摘要

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 moire 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 spinpolarized 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.