Chiral charge density wave in 4Hb- and 1T-TaS$_2$: The Role of interlayer coupling
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908499338854400 |
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| author | Gofman, Roni Anna Dishi, Abigail Bae, Hyeonhu Nitzav, Yuval Mangel, Ilay Ragoler, Nitzan P., Sajilesh K. Louat, Alex Watson, Matthew D. Cacho, Cephise Marchenko, Dmitry Varykhalov, Andrei Feldman, Irena Yan, Binghai Kanigel, Amit |
| author_facet | Gofman, Roni Anna Dishi, Abigail Bae, Hyeonhu Nitzav, Yuval Mangel, Ilay Ragoler, Nitzan P., Sajilesh K. Louat, Alex Watson, Matthew D. Cacho, Cephise Marchenko, Dmitry Varykhalov, Andrei Feldman, Irena Yan, Binghai Kanigel, Amit |
| contents | We use micro-angle-resolved photoemission spectroscopy (micro-ARPES) to investigate chiral charge density waves (CDWs) in 4Hb-TaS$_2$ with micron-scale spatial resolution. In the 1T layers of 4Hb-TaS$_2$, we uncover coexisting left- and right-handed CDW domains and resolve four distinct spectral patterns arising from the interplay of chirality and rotational stacking. In contrast, bulk 1T-TaS$_2$ exhibits a uniform chirality. In addition, 4Hb-TaS$_2$ shows negligible out-of-plane dispersion of the 1T-derived bands, in contrast to the pronounced interlayer coupling observed in bulk 1T-TaS$_2$. Density functional theory (DFT) calculations corroborate this picture, revealing that the interlayer interaction of the chiral order in 4Hb-TaS$_2$ is nearly two orders of magnitude weaker than in the 1T polytype. Our findings establish 4Hb-TaS$_2$ as a quasi-two-dimensional platform for exploring tunable chiral CDW phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_16559 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chiral charge density wave in 4Hb- and 1T-TaS$_2$: The Role of interlayer coupling Gofman, Roni Anna Dishi, Abigail Bae, Hyeonhu Nitzav, Yuval Mangel, Ilay Ragoler, Nitzan P., Sajilesh K. Louat, Alex Watson, Matthew D. Cacho, Cephise Marchenko, Dmitry Varykhalov, Andrei Feldman, Irena Yan, Binghai Kanigel, Amit Strongly Correlated Electrons Materials Science Superconductivity We use micro-angle-resolved photoemission spectroscopy (micro-ARPES) to investigate chiral charge density waves (CDWs) in 4Hb-TaS$_2$ with micron-scale spatial resolution. In the 1T layers of 4Hb-TaS$_2$, we uncover coexisting left- and right-handed CDW domains and resolve four distinct spectral patterns arising from the interplay of chirality and rotational stacking. In contrast, bulk 1T-TaS$_2$ exhibits a uniform chirality. In addition, 4Hb-TaS$_2$ shows negligible out-of-plane dispersion of the 1T-derived bands, in contrast to the pronounced interlayer coupling observed in bulk 1T-TaS$_2$. Density functional theory (DFT) calculations corroborate this picture, revealing that the interlayer interaction of the chiral order in 4Hb-TaS$_2$ is nearly two orders of magnitude weaker than in the 1T polytype. Our findings establish 4Hb-TaS$_2$ as a quasi-two-dimensional platform for exploring tunable chiral CDW phenomena. |
| title | Chiral charge density wave in 4Hb- and 1T-TaS$_2$: The Role of interlayer coupling |
| topic | Strongly Correlated Electrons Materials Science Superconductivity |
| url | https://arxiv.org/abs/2508.16559 |