Correlated insulating states in slow Dirac fermions on a honeycomb moir{é} superlattice
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915258181877760 |
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| author | Yang, Dongyang Liang, Jing Hu, Haodong Kaushal, Nitin Hsu, Chih-En Watanabe, Kenji Taniguchi, Takashi Dadap, Jerry. I Li, Zhenglu Franz, Marcel Ye, Ziliang |
| author_facet | Yang, Dongyang Liang, Jing Hu, Haodong Kaushal, Nitin Hsu, Chih-En Watanabe, Kenji Taniguchi, Takashi Dadap, Jerry. I Li, Zhenglu Franz, Marcel Ye, Ziliang |
| contents | Strong Coulomb repulsion is predicted to open a many-body charge gap at the Dirac point of graphene, transforming the semimetal into a Mott insulator. However, this correlated insulating phase has remained inaccessible in pristine graphene, where a large Fermi velocity dominates the interaction effects. To overcome this limitation, we realize a honeycomb moir{é} superlattice in a twisted MoSe$_2$ homobilayer, where a graphene-like band structure forms with a Fermi velocity reduced by nearly two orders of magnitude. These slow moir{é} bands are folded from the valence band maximum at the $Γ$ valley of the extended Brillouin zone with negligible spin-orbital coupling, and can therefore simulate massless Dirac fermions in the strongly correlated regime with full SU(2) symmetry. By correlating Rydberg exciton sensing with moir{é} trions of different spatial characters, we detect a Mott gap at the Dirac point that persists up to 110 K. We further identify correlated insulating states at $ν=-1$ with a weak ferromagnetic coupling as well as at several fractional fillings. Our results highlight the potential of studying a wide range of quantum many-body phenomena in twisted two-dimensional materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_17970 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Correlated insulating states in slow Dirac fermions on a honeycomb moir{é} superlattice Yang, Dongyang Liang, Jing Hu, Haodong Kaushal, Nitin Hsu, Chih-En Watanabe, Kenji Taniguchi, Takashi Dadap, Jerry. I Li, Zhenglu Franz, Marcel Ye, Ziliang Mesoscale and Nanoscale Physics Strongly Correlated Electrons Strong Coulomb repulsion is predicted to open a many-body charge gap at the Dirac point of graphene, transforming the semimetal into a Mott insulator. However, this correlated insulating phase has remained inaccessible in pristine graphene, where a large Fermi velocity dominates the interaction effects. To overcome this limitation, we realize a honeycomb moir{é} superlattice in a twisted MoSe$_2$ homobilayer, where a graphene-like band structure forms with a Fermi velocity reduced by nearly two orders of magnitude. These slow moir{é} bands are folded from the valence band maximum at the $Γ$ valley of the extended Brillouin zone with negligible spin-orbital coupling, and can therefore simulate massless Dirac fermions in the strongly correlated regime with full SU(2) symmetry. By correlating Rydberg exciton sensing with moir{é} trions of different spatial characters, we detect a Mott gap at the Dirac point that persists up to 110 K. We further identify correlated insulating states at $ν=-1$ with a weak ferromagnetic coupling as well as at several fractional fillings. Our results highlight the potential of studying a wide range of quantum many-body phenomena in twisted two-dimensional materials. |
| title | Correlated insulating states in slow Dirac fermions on a honeycomb moir{é} superlattice |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.17970 |