Tunable spin and valley excitations of correlated insulators in Γ-valley moiré bands
Abstract
Moiré superlattices formed from transition metal dichalcogenides (TMDs) have been shown to support a variety of quantum electronic phases that are highly tunable using applied electromagnetic fields. While the valley character of the low-energy states dramatically affects optoelectronic properties in the constituent TMDs, this degree of freedom has yet to be fully explored in moiré systems. Here, we establish twisted double bilayer WSe2 as an experimental platform to study electronic correlations within Γ-valley moiré bands. Through a combination of local and global electronic compressibility measurements, we identify charge-ordered phases at multiple integer and fractional moiré band fillings ν. By measuring the magnetic field dependence of their energy gaps and the chemical potential upon doping, we reveal spin-polarized ground states with novel spin polaron quasiparticle excitations. In addition, an applied displacement field allows us to realize a new mechanism of metal-insulator transition at ν=–1 driven by tuning between Γ- and K-valley moiré bands. Together, our results demonstrate control over both the spin and valley character of the correlated ground and excited states in this system.
- Authors:
-
[2];
[3];
[4];
[4];
[2];
[5]
- Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Tennessee, Knoxville, TN (United States)
- National Institute for Materials Science (NIMS), Tsukuba (Japan)
- Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 2002876
- Grant/Contract Number:
- AC02-76SF00515; NSF-DMR-2103910; ECCS-2026822
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Materials
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 6; Journal ID: ISSN 1476-1122
- Publisher:
- Springer Nature
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; electronic properties and materials; two-dimensional materials
Citation Formats
Foutty, Benjamin A., Yu, Jiachen, Devakul, Trithep, Kometter, Carlos R., Zhang, Yang, Watanabe, Kenji, Taniguchi, Takashi, Fu, Liang, and Feldman, Benjamin E. Tunable spin and valley excitations of correlated insulators in Γ-valley moiré bands. United States: N. p., 2023.
Web. doi:10.1038/s41563-023-01534-z.
Foutty, Benjamin A., Yu, Jiachen, Devakul, Trithep, Kometter, Carlos R., Zhang, Yang, Watanabe, Kenji, Taniguchi, Takashi, Fu, Liang, & Feldman, Benjamin E. Tunable spin and valley excitations of correlated insulators in Γ-valley moiré bands. United States. https://doi.org/10.1038/s41563-023-01534-z
Foutty, Benjamin A., Yu, Jiachen, Devakul, Trithep, Kometter, Carlos R., Zhang, Yang, Watanabe, Kenji, Taniguchi, Takashi, Fu, Liang, and Feldman, Benjamin E. Mon .
"Tunable spin and valley excitations of correlated insulators in Γ-valley moiré bands". United States. https://doi.org/10.1038/s41563-023-01534-z. https://www.osti.gov/servlets/purl/2002876.
@article{osti_2002876,
title = {Tunable spin and valley excitations of correlated insulators in Γ-valley moiré bands},
author = {Foutty, Benjamin A. and Yu, Jiachen and Devakul, Trithep and Kometter, Carlos R. and Zhang, Yang and Watanabe, Kenji and Taniguchi, Takashi and Fu, Liang and Feldman, Benjamin E.},
abstractNote = {Moiré superlattices formed from transition metal dichalcogenides (TMDs) have been shown to support a variety of quantum electronic phases that are highly tunable using applied electromagnetic fields. While the valley character of the low-energy states dramatically affects optoelectronic properties in the constituent TMDs, this degree of freedom has yet to be fully explored in moiré systems. Here, we establish twisted double bilayer WSe2 as an experimental platform to study electronic correlations within Γ-valley moiré bands. Through a combination of local and global electronic compressibility measurements, we identify charge-ordered phases at multiple integer and fractional moiré band fillings ν. By measuring the magnetic field dependence of their energy gaps and the chemical potential upon doping, we reveal spin-polarized ground states with novel spin polaron quasiparticle excitations. In addition, an applied displacement field allows us to realize a new mechanism of metal-insulator transition at ν=–1 driven by tuning between Γ- and K-valley moiré bands. Together, our results demonstrate control over both the spin and valley character of the correlated ground and excited states in this system.},
doi = {10.1038/s41563-023-01534-z},
journal = {Nature Materials},
number = 6,
volume = 22,
place = {United States},
year = {Mon Apr 17 00:00:00 EDT 2023},
month = {Mon Apr 17 00:00:00 EDT 2023}
}
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