Extended strange metal and superconductivity in partially filled moiré Hubbard bands
Abstract
Moiré semiconductors provide a physical realization of the Hubbard model. Bandwidth-tuned Mott transitions and complex phase diagrams mimicking those of high-temperature superconductors have been demonstrated near a weak Mott insulating state at half-band-filling. The platform also provides an opportunity to explore the physics of a partially filled Hubbard band at doping densities far away from the Mott insulator, a regime that has remained largely unexplored. Here we report the emergence of an extended strange metal (ESM), in both doping density and twist angle, in a partially filled Hubbard band of twisted bilayer WSe2. The ESM is in the clean limit, persists down to about 50mK, and spans over multiple symmetry-breaking ground states; it also appears only at small twist angles, where electronic correlations are strong. These observations distinguish the state from the reported strange metals associated with quantum criticality and favor the viewpoint that it is an intrinsic state of matter. We also report the observation of a new superconducting dome being developed from the ESM but far away from both the Mott insulating state and the van Hove singularity of the material. Our work opens the door to exploring the new regime of partially filled Hubbard bands in the clean limit.
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BibTeX
@misc{xia2026extended,
title = {{Extended strange metal and superconductivity in partially filled moiré Hubbard bands}},
author = {Yiyu Xia and Yichi Zhang and Zhongdong Han and Hongyuan Li and Brandon Bauer and Kenji Watanabe and Takashi Taniguchi and Wenjin Zhao and Jie Shan and Kin Fai Mak},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.22307},
eprint = {2610.22307},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.22307},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Extended strange metal and superconductivity in partially filled moiré Hubbard bands
AU - Yiyu Xia
AU - Yichi Zhang
AU - Zhongdong Han
AU - Hongyuan Li
AU - Brandon Bauer
AU - Kenji Watanabe
AU - Takashi Taniguchi
AU - Wenjin Zhao
AU - Jie Shan
AU - Kin Fai Mak
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.22307
UR - https://arxiv.org/abs/2610.22307
AB - Moiré semiconductors provide a physical realization of the Hubbard model. Bandwidth-tuned Mott transitions and complex phase diagrams mimicking those of high-temperature superconductors have been demonstrated near a weak Mott insulating state at half-band-filling. The platform also provides an opportunity to explore the physics of a partially filled Hubbard band at doping densities far away from the Mott insulator, a regime that has remained largely unexplored. Here we report the emergence of an extended strange metal (ESM), in both doping density and twist angle, in a partially filled Hubbard band of twisted bilayer WSe2. The ESM is in the clean limit, persists down to about 50mK, and spans over multiple symmetry-breaking ground states; it also appears only at small twist angles, where electronic correlations are strong. These observations distinguish the state from the reported strange metals associated with quantum criticality and favor the viewpoint that it is an intrinsic state of matter. We also report the observation of a new superconducting dome being developed from the ESM but far away from both the Mott insulating state and the van Hove singularity of the material. Our work opens the door to exploring the new regime of partially filled Hubbard bands in the clean limit.
ER -