Untangle charge-order dependent bulk states from surface effects in a topological kagome metal ScV$_6$Sn$_6$
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911770818379776 |
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| author | Cheng, Zi-Jia Shao, Sen Kim, Byunghoon Cochran, Tyler A. Yang, Xian P. Yi, Changjiang Jiang, Yu-Xiao Zhang, Junyi Hossain, Md Shafayat Roychowdhury, Subhajit Yilmaz, Turgut Vescovo, Elio Fedorov, Alexei Chandra, Shekhar Felser, Claudia Chang, Guoqing Hasan, M. Zahid |
| author_facet | Cheng, Zi-Jia Shao, Sen Kim, Byunghoon Cochran, Tyler A. Yang, Xian P. Yi, Changjiang Jiang, Yu-Xiao Zhang, Junyi Hossain, Md Shafayat Roychowdhury, Subhajit Yilmaz, Turgut Vescovo, Elio Fedorov, Alexei Chandra, Shekhar Felser, Claudia Chang, Guoqing Hasan, M. Zahid |
| contents | Kagome metals with charge density wave (CDW) order exhibit a broad spectrum of intriguing quantum phenomena. The recent discovery of the novel kagome CDW compound ScV$_6$Sn$_6$ has spurred significant interest. However, understanding the interplay between CDW and the bulk electronic structure has been obscured by a profusion of surface states and terminations in this quantum material. Here, we employ photoemission spectroscopy and potassium dosing to elucidate the complete bulk band structure of ScV$_6$Sn$_6$, revealing multiple van Hove singularities near the Fermi level. We surprisingly discover a robust spin-polarized topological Dirac surface resonance state at the M point within the two-fold van Hove singularities. Assisted by the first-principle calculations, the temperature dependence of the $k_z$- resolved ARPES spectrum provides unequivocal evidence for the proposed $\sqrt{3}$$\times$$\sqrt{3}$$\times3$ charge order over other candidates. Our work not only enhances the understanding of the CDW-dependent bulk and surface states in ScV$_6$Sn$_6$ but also establishes an essential foundation for potential manipulation of the CDW order in kagome materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_02341 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Untangle charge-order dependent bulk states from surface effects in a topological kagome metal ScV$_6$Sn$_6$ Cheng, Zi-Jia Shao, Sen Kim, Byunghoon Cochran, Tyler A. Yang, Xian P. Yi, Changjiang Jiang, Yu-Xiao Zhang, Junyi Hossain, Md Shafayat Roychowdhury, Subhajit Yilmaz, Turgut Vescovo, Elio Fedorov, Alexei Chandra, Shekhar Felser, Claudia Chang, Guoqing Hasan, M. Zahid Strongly Correlated Electrons Kagome metals with charge density wave (CDW) order exhibit a broad spectrum of intriguing quantum phenomena. The recent discovery of the novel kagome CDW compound ScV$_6$Sn$_6$ has spurred significant interest. However, understanding the interplay between CDW and the bulk electronic structure has been obscured by a profusion of surface states and terminations in this quantum material. Here, we employ photoemission spectroscopy and potassium dosing to elucidate the complete bulk band structure of ScV$_6$Sn$_6$, revealing multiple van Hove singularities near the Fermi level. We surprisingly discover a robust spin-polarized topological Dirac surface resonance state at the M point within the two-fold van Hove singularities. Assisted by the first-principle calculations, the temperature dependence of the $k_z$- resolved ARPES spectrum provides unequivocal evidence for the proposed $\sqrt{3}$$\times$$\sqrt{3}$$\times3$ charge order over other candidates. Our work not only enhances the understanding of the CDW-dependent bulk and surface states in ScV$_6$Sn$_6$ but also establishes an essential foundation for potential manipulation of the CDW order in kagome materials. |
| title | Untangle charge-order dependent bulk states from surface effects in a topological kagome metal ScV$_6$Sn$_6$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2402.02341 |