Journal
NATURE NANOTECHNOLOGY
Volume 17, Issue 9, Pages 934-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41565-022-01180-7
Keywords
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Funding
- National Key R&D Program of China [2021YFA1401300]
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0022058, DE-SC0019481]
- National Science Foundation (NSF) [DMR-2114535]
- US Office of Naval Research [N00014-21-1-2471]
- Elemental Strategy Initiative of MEXT, Japan
- CREST, JST [JPMJCR15F3]
- NSF [NNCI-2025233]
- U.S. Department of Energy (DOE) [DE-SC0019481, DE-SC0022058] Funding Source: U.S. Department of Energy (DOE)
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Twisting the AB-homobilayer of WSe2 enables the realization of bilayer Hubbard model in the weak interlayer hopping limit, leading to observation of competing electronic states transition.
Twisted WSe2 AB-homobilayers enable the realization of bilayer Hubbard models in the weak interlayer hopping limit. Moire materials with flat electronic bands provide a highly controllable quantum system for studies of strong-correlation physics and topology. In particular, angle-aligned heterobilayers of semiconducting transition metal dichalcogenides with large band offset realize the single-band Hubbard model. Introduction of a new layer degree of freedom is expected to foster richer interactions, enabling Hund's physics, interlayer exciton condensation and new superconducting pairing mechanisms to name a few. Here we report competing electronic states in twisted AB-homobilayer WSe2, which realizes a bilayer Hubbard model in the weak interlayer hopping limit for holes. By layer-polarizing holes via a perpendicular electric field, we observe a crossover from an excitonic insulator to a charge-transfer insulator at a hole density of nu = 1 (in units of moire density), a transition from a paramagnetic to an antiferromagnetic charge-transfer insulator at nu = 2 and evidence for a layer-selective Mott insulator at 1 < nu < 2. The unique coupling of charge and spin to external electric and magnetic fields also manifests a giant magnetoelectric response. Our results establish a new solid-state simulator for the bilayer Hubbard model Hamiltonian.
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