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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2511.14570 |
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| _version_ | 1866914606142717952 |
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| author | Li, Yiwei Xu, Lixuan Zhang, Shihao Liu, Lanxin Zhou, Yifan Wan, Qiang Chen, Shiwei Liang, Shiheng Chen, Yulin Yang, Yi-feng Luo, Xuan Sun, Yuping Xu, Nan Liu, Zhongkai |
| author_facet | Li, Yiwei Xu, Lixuan Zhang, Shihao Liu, Lanxin Zhou, Yifan Wan, Qiang Chen, Shiwei Liang, Shiheng Chen, Yulin Yang, Yi-feng Luo, Xuan Sun, Yuping Xu, Nan Liu, Zhongkai |
| contents | 4Hb-TaS_2, a van der Waals superlattice comprising alternate stacked Ising superconducting 1H-TaS_2 and cluster Mott insulating 1T-TaS_2, exhibits emergent properties beyond those of its constituent layers. Notable phenomena include time-reversal-symmetry-breaking superconductivity and spontaneous vortex phases, which are driven by nontrivial interlayer interactions that remain debated. Using area-selective angle-resolved photoemission spectroscopy, we provide direct spectroscopic evidence of such interaction by systematically probing the electronic structures of 1T- and 1H-terminted surfaces of 4Hb-TaS_2. The metallic states of subsurface 1H-layers are folded to the Brillouin zone center by the sqrt(13) by sqrt(13) modulation of the surface 1T-layer, forming chiral "windmill" Fermi surfaces via Umklapp scattering. These conducting states further hybridize with the incipient flat band of the surface 1T-layer, producing a Kondo-like peak at the Fermi level. Interlayer charge transfer induces distinct 3 by 3 and 2 by 2 charge orders on the surface and subsurface 1H-layers, respectively, which result in characteristic segmented Fermi surfaces and dichotomously shift the van Hove singularities. These findings reconcile the competing Kondo and Mott-Hubbard models in this material and emphasize the interplay of flat bands, van hove singularities, charge orders, and unconventional superconductivity in correlated superlattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_14570 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interlayer Coupling Driven Correlated and Charge-Ordered Electronic States in a Transition Metal Dichalcogenide Superlattice Li, Yiwei Xu, Lixuan Zhang, Shihao Liu, Lanxin Zhou, Yifan Wan, Qiang Chen, Shiwei Liang, Shiheng Chen, Yulin Yang, Yi-feng Luo, Xuan Sun, Yuping Xu, Nan Liu, Zhongkai Strongly Correlated Electrons Materials Science 4Hb-TaS_2, a van der Waals superlattice comprising alternate stacked Ising superconducting 1H-TaS_2 and cluster Mott insulating 1T-TaS_2, exhibits emergent properties beyond those of its constituent layers. Notable phenomena include time-reversal-symmetry-breaking superconductivity and spontaneous vortex phases, which are driven by nontrivial interlayer interactions that remain debated. Using area-selective angle-resolved photoemission spectroscopy, we provide direct spectroscopic evidence of such interaction by systematically probing the electronic structures of 1T- and 1H-terminted surfaces of 4Hb-TaS_2. The metallic states of subsurface 1H-layers are folded to the Brillouin zone center by the sqrt(13) by sqrt(13) modulation of the surface 1T-layer, forming chiral "windmill" Fermi surfaces via Umklapp scattering. These conducting states further hybridize with the incipient flat band of the surface 1T-layer, producing a Kondo-like peak at the Fermi level. Interlayer charge transfer induces distinct 3 by 3 and 2 by 2 charge orders on the surface and subsurface 1H-layers, respectively, which result in characteristic segmented Fermi surfaces and dichotomously shift the van Hove singularities. These findings reconcile the competing Kondo and Mott-Hubbard models in this material and emphasize the interplay of flat bands, van hove singularities, charge orders, and unconventional superconductivity in correlated superlattices. |
| title | Interlayer Coupling Driven Correlated and Charge-Ordered Electronic States in a Transition Metal Dichalcogenide Superlattice |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2511.14570 |